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Temporary Anchorage Devices in Clinical Orthodontics

Temporary Anchorage Devices in Clinical Orthodontics

Diplomate, American Board of Orthodontics

Professor and Chair

Postgraduate Orthodontic Program

Arizona School of Dentistry & Oral Health

A.T. Still University Mesa, AZ, USA;

International Scholar

Graduate School of Dentistry

Kyung Hee University

Seoul, South Korea

This edition first published 2020 © 2020 John Wiley & Sons, Inc.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by law. Advice on how to obtain permission to reuse material from this title is available at http://www.wiley.com/go/permissions.

The right of Jae Hyun Park to be identified as the author of this work has been asserted in accordance with law.

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Library of Congress Cataloging‐in‐Publication Data

Names: Park, Jae Hyun, 1963– editor.

Title: Temporary anchorage devices in clinical orthodontics / edited by Jae Hyun Park.

Description: Hoboken, NJ : Wiley-Blackwell, 2020. | Includes bibliographical references and index.

Identifiers: LCCN 2019047712 (print) | LCCN 2019047713 (ebook) | ISBN 9781119513476 (hardback) | ISBN 9781119513650 (adobe pdf) | ISBN 9781119513629 (epub)

Subjects: MESH: Orthodontic Anchorage Procedures–methods | Orthodontic Appliances | Case Reports

Classification: LCC RK521 (print) | LCC RK521 (ebook) | NLM WU 400 | DDC 617.6/43–dc23

LC record available at https://lccn.loc.gov/2019047712

LC ebook record available at https://lccn.loc.gov/2019047713

Cover Design: Wiley

Cover Images: (top left) Image of human teeth courtesy of Joorok Park, (bottom left) line drawing of human gum courtesy of KJ Lee, (right) Scanned image of human skeleton courtesy of Dr. Tung Nguyen

Set in 9.5/12.5pt STIXTwoText by SPi Global, Pondicherry, India

10 9 8 7 6 5 4 3 2 1

Contents

List of Contributors xi

Foreword xxi

Preface xxiii

Acknowledgement xxv

About the Editor xxvii

Section I Fundamental Perspectives on TADs 1

1 An Overview of Clinical Applications for Temporary Anchorage Devices (TADs) 3

Jae Hyun Park and Kyungsup Shin

2 Biomechanical Considerations for Controlling Target Tooth Movement with Mini-implants 17

Jung Yul Cha

3 Biomechanical Simulations for Various Clinical Scenarios Treated with TADs 27

Tai-Hsien Wu and Ching-Chang Ko

4 Histological Aspects During the Healing Process with TADs 37

Toru Deguchi

5 The Effects of TADs on the Alveolar Bone 45

Jing Chen, Karolina Kister, and Sunil Wadhwa

6 Mechanical Aspects of TADs 53

Toru Deguchi and Do-Gyoon Kim

7 Factors Affecting the Failure of TADs and Effor ts to Improve the Biomechanical Stability of TADs 61

Sung-Hwan Choi and Chung-Ju Hwang

8 TADs and Successful Clinical Outcomes 69

Chung H. Kau and Terpsithea Christou

9 Clinical, Mechanical, and Diagnostic Indices for the Placement of TADs 77

Mitsuru Motoyoshi

10 Considerations for the Placement of TADs 83

Alejandro A. Romero-Delmastro, Onur Kadioglu, and G. Frans Currier

11 Understanding Implant Sites for TADs 91

Hyung Seog Yu

12 Palatal TADs: Anatomical Considerations 99

Mohamed Bayome, Jae Hyun Park, and Yoon-Ah Kook

13 Implant Site Selection 107

Sebastian Baumgaertel

Section II Three-dimensional Correction with TADs 115

Anteroposterior Correction 117

14 Treating Skeletal Class II Hyperdivergent Patients: A Structured Decision-making Process 117

Peter H. Buschang and Larry Tadlock

15 Class II Correction with Skeletal Anchorage and Forsus 133

Min-Ho Jung

16 Distalization of Maxillary and Mandibular Molars with TADs 143

Jae Hyun Park, Mohamed Bayome, and Yoon-Ah Kook

17 Effective Treatment of Class II Malocclusion with the TAD-suppor ted amda® 153

Moschos A. Papadopoulos

18 The Use of TADs with a Wilson Distalizing Arch 161

Tarek El‐Bialy and Budi Kusnoto

19 The Use of TADs to Correct Challenging Class II Sagittal Discrepancies 169

Goli K. Parsi and Mohamed I. Masoud

20 Dentofacial Orthopedics for Class III Corrections with Bone‐anchored Maxillary Protraction 185

Tung Nguyen

21 TAD-anchored Maxillary Protraction 191

Dong-Hwa Chung

22 Protraction Headgear with Surgical Miniplates 199

Bong‐Kuen Cha

Transverse Correction 213

23 Total Arch Distalization and Control of Transverse Discrepancy with TADs 213

Ju Young Lee, Hwa Sung Chae, and Young Ho Kim

24 Maxillary Expansion in Skeletally Mature Patients with TADs 223

Won Moon

25 Maxillary Expansion with TADs in Young Adults 233

Peter Ngan and Hong He

26 TAD-assisted Naso-maxillo-pharyngeal Expansion 243

Kyung-A Kim, Su-Jung Kim, and Young-Guk Park

27 Scissor Bite Correction with TADs 259

Kyung-Min Lee, Sung-Hoon Lim, Gye-Hyeong Lee, and Jae Hyun Park

Vertical Correction 271

28 Clinical Outcomes with TADs and Conventional Mechanics in Adult Skeletal Open Bite and Class II Patients 271

Toru Deguchi and Keiichiro Watanabe

29 Control of Vertical Dimension and Chin Position in Class II Malocclusion with Miniscrew Implants 285

P. Emile Rossouw, Dimitrios Michelogiannakis, and Glen Hintz

30 Anterior Open Bite Correction with One Midpalatal TAD 297 Tae-Woo Kim

31 Treatment of Open Bite with TADs: The Nature of Molar Intrusion and Relapse 309

Masato Kaku, Kazuo Tanne, and Kotaro Tanimoto

32 Double Arch Intrusion: Effective Use of TADs to Correct Vertical Excess 319 Cheol-Ho Paik and Hwee-Ho Kim

Section III Clinical Applications of TADs 327

33 Three-dimensional Application of Orthodontic Miniscrews and Their Long-term Stability 329 Yoon Jeong Choi and Young-Chel Park

34 Tweed–Merrifield Directional Force Technology with TADs 337 Jong-Moon Chae and Jae Hyun Park

35 Non-extraction Treatment of Class II Hyperdivergent Patients with Orthodontic Mini-implants 349

Hyo-Won Ahn and Seung-Hak Baek

36 Clinical Application of Palatal TADs 359 Sung-Hoon Lim

37 Management of Missing Teeth with C-implants 369 Seong-Hun Kim, Min-Ki Noh, Kyu-Rhim Chung, and Gerald Nelson

38 Indirect Miniscrew Anchorage for Adjunctive Orthodontic Treatment: Clinical Applications and Stability 383 Kyung-Ho Kim, Yoon Jeong Choi, and Woowon Jang

39 TADs for Limited Orthodontic Treatment 393

Masamitsu Takahashi and Satoshi Uzuka

40 Uprighting Impacted Mandibular Second Molars with a Cantilever System Using TADs 405 Sang-Jin Sung

41 Orthodontic Treatment of TMD Patients with Posterior Intrusion Using TADs 415 Gye-Hyeong Lee, Sang-Mi Lee, Sun Kyong Yoo, and Jae Hyun Park

42 Insights to Extraradicular Bone Screw Applications for Challenging Malocclusions 433

Chris H. Chang, Joshua S. Lin, Hsin-Yin Yeh, and W. Eugene Roberts

43 The Biomechanics of Extra-alveolar TADs in Or thodontics 445

Marcio Rodrigues de Almeida

44 A New and Innovative TAD System for Improved Stability and Versatility 455

Carlos Villegas and Flavio Uribe

45 Palatal and Ramal Plate Applications 467

Yoon-Ah Kook, Jae Hyun Park, and Mohamed Bayome

46 Miniscrews vs. Miniplates 477

Nour Eldin Tarraf and M. Ali Darendeliler

47 Progress of Anchorage in Lingual Orthodontic Treatment 489

Hee Moon Kyung

48 Biomechanics of Lingual Orthodontics and TADs 497

Ryoon-Ki Hong

49 TADs with a Fully Customized CAD-CAM Lingual Bracket System 513

Toru Inami

50 TAD-assisted Lingual Retractors 527

Ki-Ho Park, Hyo-Won Ahn, and Yoon-Goo Kang

51 TADs and Invisalign: Making Difficult Movement Possible 541

Joorok Park and Robert L. Boyd

52 The Use of TADs with Clear Aligners for Asymmetry Correction 555

William J. Kottemann

53 Microimplant-assisted Aligner Therapy 563

Ramon Mompell and S. Jay Bowman

54 Safe and Precise TAD Placement in the Anterior Palate with Simple and Inexpensive TAD Guides 577

Philipp Eigenwillig, Björn Ludwig, and Axel Bumann,

Section IV Esthetic Control with TADs 587

55 Correction of Occlusal Canting with TADs 589

Tae-Woo Kim

56 Treatment of Facial Asymmetry with Microimplants 603

Hyo-Sang Park

57 Facial Asymmetry: Non-surgical Orthodontic Treatment Considerations 615

Kelvin Wen-Chung Chang

58 The Application of TADs for Gummy Smile Correction 633

Kee-Joon Lee

59 Application of TADs in an Adult Gummy Smile Case with Ver tical Maxillary Excess 647

Johnny J.L. Liaw

60 Facial Esthetics-oriented Treatment Planning with Dental VTOs and TADs 661

Sercan Akyalcin

61 Improved Facial Profile with Premolar Extraction and Molar Intrusion Using TADs and VTOs 675

Kiyoshi Tai and Jae Hyun Park

Section V Application of TADs in Surgical Cases 685

62 TADs vs. Orthognathic Surgery 687

Jeong‐Ho Choi

63 Advantages of Miniscrew Usage for Pre‐ and Post-operative Orthodontics in Skeletal Class III Malocclusion Patients 697

Seong Sik Kim and Sung‐Hun Kim

64 Orthodontic Biomechanics with Miniplates in the Surgery‐first Orthognathic Approach 709

Jorge Faber, Carolina Faber, and Patricia Valim

Section VI Complications with the Use of TADs 717

65 Biomechanical Mistakes Related to the Use of TADs 719

Ki Beom Kim and Guilherme Thiesen

66 Pros and Cons of Miniscrews and Miniplates for Orthodontic Treatment 731

Cheol‐Hyun Moon

67 Orthodontic Miniscrews: The Pearls and Pitfalls of TADs 739

Takashi Ono

68 Success with TADs: Evidence and Experience 747

Melih Motro and Leslie A . Will

69 Legal Considerations When Using TADs 757

Laurance Jerrold and Michael Schulte

Index 765

List of Contributors

Hyo-Won Ahn, DDS, PhD Associate Professor Department of Orthodontics School of Dentistry

Kyung Hee University Seoul, South Korea

Sercan Akyalcin, DDS, MS, PhD

Associate Professor and Graduate Program Director Department of Orthodontics School of Dental Medicine

Tufts University Boston, MA, USA

Seung-Hak Baek, DDS, PhD Professor Department of Orthodontics School of Dentistry

Seoul National University Seoul, South Korea

Sebastian Baumgaertel, DMD, MSD, FRCD(C) Clinical Associate Professor Department of Orthodontics School of Dental Medicine

Case Western Reserve University Cleveland, OH, USA

Mohamed Bayome, BDS, MMS, PhD Assistant Professor Department of Preventive Dentistry College of Dentistry

King Faisal University

Al-hofuf, Saudi Arabia; and Department of Postgraduate Studies Universidad Autonóma del Paraguay Asunción, Paraguay

S. Jay Bowman, DMD, MSD

Adjunct Associate Professor Department of Orthodontics Center for Advanced Dental Education St. Louis University

St. Louis, MO; Instructor Department of Orthodontics School of Dentistry

University of Michigan

Ann Arbor, MI; and Private Practice Portage, MI, USA

Robert L. Boyd, DDS, Med Professor Emeritus Department of Orthodontics

Arthur A. Dugoni School of Dentistry University of the Pacific San Francisco, CA, USA

Axel Bumann, DDS, PhD, Prof.Dr.Med.Dent.

Associate Professor Department of Orthodontics Christian-Albrechts-University Kiel; and Private Practice Berlin, Germany

Peter H. Buschang, PhD

Regents Professor and Director of Orthodontic Research Department of Orthodontics

Texas A&M University College of Dentistry Dallas, TX, USA

Bong-Kuen Cha, DDS, MSD, Dr.Med.Dent. Professor

Department of Orthodontics College of Dentistry

Gangneung-Wonju National University Gangneung, South Korea

Jung Yul Cha, DDS, MS, PhD Professor Department of Orthodontics

Institute of Craniofacial Deformity

Yonsei University College of Dentistry

Seoul, South Korea

Hwa Sung Chae, DDS, MSD, PhD Lecture Professor

Department of Orthodontics Institute of Oral Health Science

Ajou University School of Medicine Suwon, South Korea

Jong-Moon Chae, DDS, MSD, PhD Professor

Department of Orthodontics School of Dentistry

University of Wonkwang Wonkwang Dental Research Institute

Iksan, South Korea; and Visiting Scholar

Postgraduate Orthodontic Program

Arizona School of Dentistry & Oral Health

A.T. Still University Mesa, AZ, USA

Chris H. Chang, DDS, PhD

Founder and President

Beethoven Orthodontic Center Hsinchu, Taiwan

Kelvin Wen-Chung Chang, DDS, MS

Adjunct Clinical Instructor

Division of Orthodontics and Dentofacial Orthopedics Department of Dentistry

National Taiwan University Hospital Taipei, Taiwan

Jing Chen, PhD, DDS

Assistant Professor and Program Director Division of Orthodontics College of Dental Medicine Columbia University New York, NY, USA

Jeong-Ho Choi, DDS, MSD, PhD

Adjunct Associate Professor Department of Orthodontics School of Dentistry

Seoul National University Seoul, South Korea

Sung-Hwan Choi, DDS, MS, PhD

Assistant Professor

Department of Orthodontics

Institute of Craniofacial Deformity

Yonsei University College of Dentistry

Seoul, South Korea

Yoon Jeong Choi, DDS, MSD, PhD

Associate Professor

Department of Orthodontics

Institute of Craniofacial Deformity

Yonsei University College of Dentistry

Seoul, South Korea

Terpsithea Christou, DDS, MS, Cert(Ortho)

Assistant Professor and Clinical Director

Department of Orthodontics

School of Dentistry

University of Alabama at Birmingham Birmingham, AL, USA

Dong-Hwa Chung, DDS, MS, PhD

Professor and Chair

Department of Orthodontics

College of Dentistry

Dankook University Cheonan, South Korea

Kyu-Rhim Chung, DMD, MSD, PhD

Clinical Professor

Department of Orthodontics

School of Dentistry

Kyung Hee University

Seoul, South Korea

G. Frans Currier, DDS, MSD, Med

David Ross Boyd Professor and Head

R.S. Nanda Endowed Chair Department of Developmental Dentistry

Division of Orthodontics College of Dentistry

University of Oklahoma HSC

Oklahoma City, OK, USA

M. Ali Darendeliler, BDS, PhD, Dip.Orth., Certif.Orth., Priv.Doc., MRACDS(Ortho), FICD

Professor and Chair

Discipline of Orthodontics and Pediatric Dentistry

School of Dentistry

Faculty of Medicine and Health

University of Sydney, Sydney; and Head

Department of Orthodontics

Sydney Dental Hospital

Sydney Local Health District

Sydney, Australia

Toru Deguchi, DDS, MSD, PhD

Associate Professor and Graduate Program Director

Division of Orthodontics

College of Dentistry

The Ohio State University Columbus, OH, USA

Philipp Eigenwillig, Dr.Med.Dent.

Private Practice

Brandenburg an der Havel Germany

Tarek El-Bialy, BDS, MSc, PhD, EMBA, DrMedDent

Professor Division of Orthodontics

Department of Biomedical Engineering Faculty of Medicine and Dentistry

University of Alberta Edmonton, Canada

Carolina Faber, DDS

Private Practice

Brasília, Brazil

Jorge Faber, DDS, MS, PhD

Professor

Postgraduate Program in Dentistry University of Brasília, Brasília; and Private Practice

Brasília, Brazil

Hong He, DDS, MDS, PhD

Professor

Department of Orthodontics

Hubei-MOST KLOS & KLOBM

School & Hospital of Stomatology Wuhan University Wuhan, China

Glen Hintz, MS

Associate Professor

Medical Illustration Program Director

BFA Medical Illustration and Chairperson

School of Art & School for American Crafts College of Art and Design

Rochester Institute of Technology Rochester, NY, USA

Ryoon-Ki Hong, DDS, PhD

Adjunct Assistant Professor Department of Orthodontics College of Dentistry

Seoul National University, Seoul; and

Chair

Department of Orthodontics

Chong-A Dental Hospital

Seoul, South Korea

Chung-Ju Hwang, DDS, MS, PhD

Professor

Department of Orthodontics

Institute of Craniofacial Deformity

Yonsei University College of Dentistry

Seoul, South Korea

Toru Inami, DDS, PhD

Clinical Professor

Department of Orthodontics

Aichi Gakuin University

Nagoya; and Private Practice Kyoto, Japan

Woowon Jang, DDS, MSD, PhD

Clinical Assistant Professor Department of Orthodontics

School of Dentistry

Kyung Hee University

Seoul, South Korea

Laurance Jerrold, DDS, JD Professor and Chair Program Director

Orthodontic Residency Program NYU Langone Health Brooklyn, NY, USA

Min-Ho Jung, DDS, MSD, PhD

Adjunct Associate Professor Department of Orthodontics

Dental Research Institute

School of Dentistry

Seoul National University Seoul; and Private Practice

Seoul, South Korea

Onur Kadioglu, DDS, MS

Associate Professor and Program Director Graduate Alumni Endowed Chair Department of Developmental Dentistry

Division of Orthodontics

College of Dentistry

University of Oklahoma HSC Oklahoma City, OK, USA

Yoon-Goo Kang, DMD, MSD, PhD

Associate professor

Department of Orthodontics School of Dentistry

Kyung Hee University Seoul, South Korea

Masato Kaku, DDS, PhD

Professor Department of Anatomy and Functional Restorations

Division of Oral Health Sciences

Hiroshima University Graduate School of Biomedical Sciences

Hiroshima, Japan

Chung H. Kau, BDS, MScD, MBA, PhD, FDSGlas, MOrthEdin, FFDIre, FAMS, FICD, FDSEdin, Cert(Ortho) Professor and Chair

Department of Orthodontics School of Dentistry

University of Alabama at Birmingham Birmingham, AL, USA

Do-Gyoon Kim, PhD

Associate Professor Division of Orthodontics College of Dentistry

The Ohio State University Columbus, OH, USA

Hwee-Ho Kim, DDS, MSD

Clinical Fellow

Department of Orthodontics Asan Medical Center College of Medicine University of Ulsan Seoul; and Clinical Faculty

Department of Orthodontics College of Dentistry

Dankook University

Cheonan, South Korea

Ki Beom Kim, DDS, MSD, PhD

Lysle E. Johnston Jr. Endowed Chair in Orthodontics

Associate Professor and Program Director

Department of Orthodontics Center for Advanced Dental Education

Saint Louis University

St. Louis, MO, USA

Kyung-A Kim, BS, MSD, PhD

Assistant Professor

Department of Orthodontics School of Dentistry

Kyung Hee University

Seoul, South Korea

Kyung-Ho Kim, DDS, MSD, PhD Professor and Chair Department of Orthodontics

Gangnam Severance Dental Hospital Institute of Craniofacial Deformity

Yonsei University College of Dentistry

Seoul, South Korea

Seong-Hun Kim, DMD, MSD, PhD

Professor and Head Department of Orthodontics

School of Dentistry

Kyung Hee University Seoul, South Korea

Seong Sik Kim, DDS, MSD, PhD Professor

Department of Orthodontics School of Dentistry

Pusan National University Yangsan, South Korea

Su-Jung Kim, DMD, MSD, PhD Professor and Chair Department of Orthodontics School of Dentistry

Kyung Hee University

Seoul, South Korea

Sung-Hun Kim, DDS, MSD, PhD

Clinical Professor

Department of Orthodontics School of Dentistry

Pusan National University Yangsan, South Korea

Tae-Woo Kim, DDS, MSD, PhD Professor

Department of Orthodontics School of Dentistry

Seoul National University Seoul, South Korea

Young Ho Kim, DDS, MS, PhD

Dean

Graduate School of Clinical Dentistry

Ajou University, Suwon;

Director

Ajou University Dental Hospital

Suwon; and Professor and Chair

Department of Orthodontics Institute of Oral Health Science

Ajou University School of Medicine Suwon, South Korea

Karolina Kister, PhD, DDS

Postdoctoral Fellow Division of Orthodontics College of Dental Medicine

Columbia University New York NY, USA

Ching-Chang Ko, DDS, MS, PhD

Distinguished Professor and Chair Division of Craniofacial and Surgical Science

Adams School of Dentistry

University of North Carolina NC, USA

Yoon-Ah Kook, DDS, PhD

Professor

Department of Orthodontics

Seoul St. Mary’s Hospital

The Catholic University of Korea Seoul, South Korea

William J. Kottemann, DDS, MS Private Practice Minneapolis, MN, USA

Budi Kusnoto, DDS, MS Professor Program and Clinic Director Department of Orthodontics College of Dentistry

University of Illinois at Chicago Chicago, IL, USA

Hee Moon Kyung, DDS, MS, PhD

Dean Emeritus and Professor Department of Orthodontics

School of Dentistry

Kyungpook National University

Daegu, South Korea

Gye-Hyeong Lee, DDS, MSD, PhD

Attending Professor Department of Orthodontics School of Dentistry

Kyung Hee University Seoul;

Attending Professor Department of Orthodontics School of Dentistry

Chonnam National University

Gwangju; and Private Practice

Yeosu, South Korea

Ju Young Lee, DDS, MSD, PhD

Clinical Professor

Department of Orthodontics Institute of Oral Health Science

Ajou University School of Medicine

Suwon, South Korea

Kee-Joon Lee, DDS, MS, PhD

Professor and Chair Department of Orthodontics Institute of Craniofacial Deformity

Yonsei University College of Dentistry

Seoul, South Korea

Kyung-Min Lee, DDS, MSD, PhD

Associate Professor Department of Orthodontics School of Dentistry

Chonnam National University

Gwangju, South Korea

Sang-Mi Lee, DDS, MSD, PhD

Adjunct professor

Department of Orthodontics School of Dentistry

Chonnam National University

Gwangju;

The Catholic University of Korea

Seoul; and Private Practice

Goyang, South Korea

Johnny J.L. Liaw, DDS, MS

Adjunct Clinical Instructor

Orthodontic Division

Dental Department

National Taiwan University Hospital Taipei, Taiwan

Sung-Hoon Lim, DDS, MSD, PhD Professor and Chair Department of Orthodontics College of Dentistry

Chosun University

Gwangju, South Korea

Joshua S. Lin, DDS

Associate Director

Beethoven Orthodontic Center

Hsinchu, Taiwan

Björn Ludwig, Dr.Med.Dent.

Private Practice

Traben Trarbach

Germany

Mohamed I. Masoud, BDS, DMSc

Assistant Professor

Director of Advanced Graduate Education in Orthodontics

Department of Developmental Biology

Harvard School of Dental Medicine

Boston, MA, USA

Dimitrios Michelogiannakis, DDS, MS

Assistant Professor Division of Orthodontics and Dentofacial Orthopedics Eastman Institute for Oral Health University of Rochester Rochester, NY, USA

Ramon Mompell, DDS, MS Researcher

Division of Growth and Development Section of Orthodontics

School of Dentistry Center for Health Science

University of California Los Angeles Los Angeles, CA, USA; and Private Practice

Madrid, Spain

Cheol-Hyun Moon, DMD, MSD, PhD

Professor and Chair Department of Orthodontics

Gil Medical Center

Gachon University College of Medicine

Incheon, South Korea

Won Moon, DMD, MS

Associate Professor and Thomas R. Bales Endowed Chair in Orthodontics

Section of Orthodontics School of Dentistry

University of California, Los Angeles CA, USA

Mitsuru Motoyoshi, DDS, PhD Professor and Chair Department of Orthodontics

Nihon University School of Dentistry

Tokyo, Japan

Melih Motro, DDS, PhD Clinical Associate Professor Department of Orthodontics

Henry M. Goldman School of Dental Medicine

Boston University Boston, MA, USA

Gerald Nelson, DDS

Professor Emeritus Division of Orthodontics Department of Orofacial Science University of California, San Francisco, CA, USA

Peter Ngan, DMD Professor and Chair Department of Orthodontics School of Dentistry West Virginia University Morgantown, WV, USA

Tung Nguyen, DMD, MS Associate Professor Division of Craniofacial and Surgical Science

Adams School of Dentistry University of North Carolina NC, USA

Min-Ki Noh, DMD, MSD, PhD Clinical Assistant Professor Department of Orthodontics School of Dentistry

Kyung Hee University Seoul, South Korea

Takashi Ono, DDS, PhD Professor and Chair Department of Orthodontic Science

Graduate School of Medical and Dental Sciences

Tokyo Medical and Dental University Tokyo, Japan

Cheol-Ho Paik, DDS, PhD

Clinical Associate Professor Department of Orthodontics College of Dentistry

Seoul National University Seoul; and Private Practice

Seoul, South Korea

Moschos A. Papadopoulos, DDS, Dr.Med.Dent. Professor Head and Program Director Department of Orthodontics School of Dentistry

Aristotle University of Thessaloniki Thessaloniki, Greece

Hyo-Sang Park, DDS, MSD, PhD Professor and Chair Department of Orthodontics School of Dentistry

Kyungpook National University Daegu, South Korea

Jae Hyun Park, DMD, MSD, MS, PhD

Professor and Chair

Postgraduate Orthodontic Program

Arizona School of Dentistry & Oral Health

A.T. Still University

Mesa, AZ, USA; and International Scholar Graduate School of Dentistry

Kyung Hee University

Seoul, South Korea

Joorok Park, DMD, MSD

Assistant Professor Department of Orthodontics

Arthur A. Dugoni School of Dentistry University of the Pacific San Francisco, CA, USA

Ki-Ho Park, DMD, MSD, PhD

Associate Professor Department of Orthodontics School of Dentistry

Kyung Hee University

Seoul, South Korea

Young-Chel Park, DDS, MSD, PhD

Dean Emeritus

Professor Emeritus Department of Orthodontics Institute of Craniofacial Deformity

Yonsei University College of Dentistry Seoul, South Korea

Young-Guk Park, DMD, MSD, PhD, MBA, FICD Provost

Kyung Hee University Seoul; and Professor

Department of Orthodontics School of Dentistry

Kyung Hee University

Seoul, South Korea

Goli K. Parsi, DDS, DScD

Clinical Associate Professor Department of Orthodontics

Henry M. Goldman School of Dental Medicine

Boston University Boston MA, USA

W. Eugene Roberts, DDS, PhD, DHC (Med) Professor Emeritus of Orthodontics and Adjunct Professor of Mechanical Engineering

Indiana University – Purdue University Indianapolis, IN; Adjunct Professor of Orthodontics

Loma Linda University

Loma Linda, CA; and St. Louis University

St. Louis, MO, USA

Marcio Rodrigues de Almeida, DDS, MSc, PhD

Professor Department of Orthodontics

University of Northern Paraná Londrina-Paraná, Brazil

Alejandro A. Romero-Delmastro, DDS, MS

Clinical Assistant Professor Department of Developmental Dentistry Division of Orthodontics College of Dentistry

University of Oklahoma HSC Oklahoma City, OK, USA

P. Emile Rossouw, BSc, BChD (Dent), BChD (Hons-Child Dent), MChD(Ortho), PhD, FRCD(C) Professor and Chair Division of Orthodontics and Dentofacial Orthopedics

Eastman Institute for Oral Health

University of Rochester Rochester, NY, USA

Michael Schulte DDS, PhD Private Practice

Camdenton, MO, USA

Kyungsup Shin, MS, PhD, DMD, MS

Assistant Professor and Graduate Program Director Department of Orthodontics College of Dentistry and Dental Clinics

University of Iowa Iowa City, IA, USA

Sang-Jin Sung, DDS, MS, PhD Professor Department of Orthodontics

Asan Medical Center College of Medicine

University of Ulsan Seoul, South Korea

Larry Tadlock, DDS, MS

Clinical Associate Professor Head and Program Director Department of Orthodontics

Texas A&M University College of Dentistry

Dallas, TX, USA

Kiyoshi Tai, DDS, PhD

Visiting Adjunct Professor Postgraduate Orthodontic Program

Arizona School of Dentistry & Oral Health

A.T. Still University Mesa, AZ, USA; and Private Practice

Okayama, Japan

Masamitsu Takahashi, D.D.S., Ph.D. Part-time Lecturer

Department of Orthodontics

Nihon University School of Dentistry Tokyo; and Private Practice

Tokyo, Japan

Kazuo Tanne, DDS, PhD

Professor Emeritus and Visiting Professor Department of Orthodontics and Craniofacial Developmental Biology

Hiroshima University Graduate School of Biomedical and Health Sciences

Hiroshima, Japan

Kotaro Tanimoto, DDS, PhD

Professor and Chair

Department of Orthodontics and Craniofacial Developmental Biology

Hiroshima University Graduate School of Biomedical and Health Sciences

Hiroshima, Japan

Nour Eldin Tarraf, BDS(Hons), MDSc(Hons), MRACDs(Ortho), MOrthRCSEd

PhD Candidate

Discipline of Orthodontics and Pediatric Dentistry

School of Dentistry

Faculty of Medicine and Health University of Sydney, Sydney; and Private Practice

Sydney, Australia

Guilherme Thiesen, DDS, MSD, PhD

Post-Doctoral Fellow

Department of Orthodontics

Center for Advanced Dental Education

Saint Louis University St. Louis, MO, USA; and Private Practice

Florianópolis, SC, Brazil

Flavio Uribe, DDS, MDentSc

Associate Professor Program Director and Interim Chair, Charles Burstone Professor Division of Orthodontics

Department of Craniofacial Sciences School of Dental Medicine

University of Connecticut

Farmington, CT, USA

Satoshi Uzuka, DDS, PhD

Associate Professor and Chair Division of Orthodontics

The Nippon Dental University Hospital Tokyo, Japan

Patricia Valim, DDS, MS Private Practice

Brasília, Brazil

Carlos Villegas, DDS

Associate Professor

Department of Orthodontics, CES University

Medellin, Colombia; and Visiting Professor

Alexandria University

Alexandria; Egypt

Sunil Wadhwa, DDS, PhD

Leuman M. Waugh DDS Associate Professor and Director

Division of Orthodontics

College of Dental Medicine

Columbia University

New York, NY, USA

Keiichiro Watanabe, DDS, PhD

Assistant Professor

Department of Orthodontics and Dentofacial Orthopedics

Graduate School of Biomedical Sciences

Tokushima University Tokushima, Japan; and Division of Orthodontics College of Dentistry

The Ohio State University Columbus, OH, USA

Leslie A. Will, DMD, MSD

Anthony A. Gianelly Professor and Chair Department of Orthodontics

Henry M. Goldman School of Dental Medicine

Boston University Boston, MA, USA

Tai-Hsien Wu, MS, PhD

Postdoctoral Fellow

Division of Craniofacial and Surgical Science

Adams School of Dentistry

University of North Carolina NC, USA

Hsin-Yin Yeh, DDS, MSD Director Beethoven Orthodontic Center Hsinchu, Taiwan

Hyung Seog Yu, DDS, MS, PhD Professor Department of Orthodontics Institute of Craniofacial Deformity Yonsei University College of Dentistry

Seoul, South Korea

Sun Kyong Yoo, DMD

International Orthodontic fellow Postgraduate Orthodontic Program

Arizona School of Dentistry & Oral Health

A.T. Still University Mesa, AZ, USA; and Private Practice Bundang, South Korea

Foreword

It is a true pleasure to be able to write the foreword for this monumental textbook on temporary anchorage devices (TADs) because it is important and timely. Orthodontic implants have been around for about three decades now. In the early days, the potential uses for TADs in clinical orthodontics was just an intriguing idea. Since the early days, interest in implants has increased tremendously, the science surrounding implants has grown massively, and, in parallel, clinical innovations involving TADS have exploded in numbers.

When TADs were initially introduced into the specialty of orthodontics, they were used primarily as a source of temporary “absolute” anchorage to perform limited types of tooth movement, design elements seemed crucial and varied tremendously, placement sites seemed limited to the interradicular and midpalatal areas, and failure rates were a significant concern. However, as time passed, practitioners started to apply TADs creatively in various ways to treat many usual and then challenging clinical situations. As a result, they have become one of the most essential tools in contemporary orthodontics because they provide solutions for conventionally difficult tooth movements, thus allowing greater orthodontic efficiency and effectiveness.

During the past 20 years, there has been tremendous growth in the quantity and quality of publications that explore the basic and applied sciences attendant to TADs. This suggests that interest in TADs remains high and it is prudent and timely to take stock of what is known at the present time via a well-organized textbook.

We are fortunate indeed that Dr. Jae Hyun Park has accomplished that task by producing this textbook. It is a huge book; it is a wonderful book; is a book overflowing with ideas, knowledge, and experience; and it is an ambitious book that can be used to address many problems.

Dr. Park is recognized both nationally and internationally as a speaker, author, editor, clinician, and educator. With regard to TADs, he is one of the most prolific authors of articles on the topic. He is definitely a very suitable person for this task and he probably could have written a book on TADs all by himself, but he did not. Drawing upon his

wide-ranging international perspectives, affiliations, and relationships, he has amassed the thoughts and experiences of more than 100 outstanding authors from all over the world.

The breadth and depth of the authors is a strong aspect of this book. The authors are knowledgeable clinicians and academics. Their names are associated with high-quality case reports and clinical research that appear in peerreviewed journals and important textbooks. They are pioneers, innovators, inventors, researchers, and masterful orthodontists.

The book contains 69 chapters arranged into six sections: fundamental perspectives, three-dimensional corrections, clinical applications, esthetic control, surgery cases, and complications. You will not be able to read this textbook all at once, but that is not a drawback at all. You need time to think and consider how all this information fits nicely together and how it might be applied.

The book begins strongly with information on the related biology, anatomy, biomaterials, and biomechanics among other topics. What follows contains pertinent information on diagnosis and treatment planning and then a voluminous amount of clinical material. Applications in orthodontics, orthopedics, and orthognathics are presented as applied to many types of malocclusions, many types of appliances (some of which are new), and many types of treatment strategies. It is interesting that the book also contains tips on how to deal with complications and failures as well as legal considerations.

As a strength, both theoretical and practical information is supplied in balance. Similarly, a nice blend of basic and advanced clinical information exists that the contemporary orthodontist should be able to incorporate TADs into practice at any level. Successful treatment protocols and strategies are presented very well; this is particularly useful in treating difficult cases. The case reports are outstanding and the illustrations excellent.

In the end, I was drawn to one whole section of the book that deals with esthetics. The reason that implants are intriguing and important to orthodontics is that they solve

problems heretofore thought difficult, if not impossible, to correct. This section presents information on midline deviations, occlusal cants, facial asymmetry, gummy smiles, and unfavorable facial profiles. Fortunately, solutions to these problems using TADs are offered by the authors. If you could only have one book on TADs for your reference and consideration, this is the book you need. If you are a student, this should be an essential textbook. If you are a clinician this is the most up-to-date book on TADs; judiciously employing the information within will allow you to achieve more control than was possible in the past, allow you to be less reliant on patient compliance, and

achieve better, more predictable results than has been possible in the past.

TADs are like magic and we thank Dr. Park and his team of magicians for presenting information about their magic tool box. Information contained therein is sufficient to enable practitioners to perform magic in remarkable ways that extends their abilities, the scope of their ministrations, and the quality of results that they obtain.

March 2020

Rolf G. Behrents, DDS, MS, PhD, PhD (Hon) Editor-in-Chief, American Journal of Orthodontics & Dentofacial Orthopedics

Preface

shrek: Ogres are like onions.

donkey: They stink?

shrek: Yes. No.

donkey: Oh, they make you cry.

shrek: No.

donkey: Oh, you leave em out in the sun, they get all brown, start sproutin’ little white hairs.

shrek: No. Layers. Onions have layers. Ogres have layers. Onions have layers. You get it? We both have layers.

donkey: Oh, you both have layers. Oh. You know, not everybody like onions.

(From Shrek, a DreamWorks animation)

There can be little argument that a phenomenal paradigm shift has occurred in the field of orthodontics with the introduction of temporary anchorage devices (TADs) over the past decade. TADs have not only allowed orthodontists to reliably control anchorage and relieve the issues of patient compliance, but they have also allowed for controlled movement of teeth in all three dimensions. Facilitation of these movements have led to the development of successful treatment protocols for various difficult cases and produced treatment results that were not considered possible with orthodontics alone in the past.

In an effort to demystify this new “ogre” in the field of orthodontics, a huge number of scientific and clinical articles have been published in peer‐reviewed articles since the introduction of TADs in the late 1990s by pioneers from Asian countries. Dental students and orthodontic residents, clinicians, and educators have felt the need for a more comprehensive and up‐to‐date textbook that can be used to comprehend and apply TADs in everyday practice. This was mainly because orthodontic TADs have been one of the fastest growing areas of modern clinical orthodontics in terms of concept and technology, not to mention the sheer volume of clinical applications. Since 2012, more than 2000 scientific articles have been published with the keywords “orthodontic miniscrew implant” and various new approaches have been introduced. Moreover,

since 2008, I have personally co‐authored more than 200 peer‐reviewed articles on related subjects, including cone‐beam computed tomography, so I have felt a strong need for a new textbook with the most current clinical guidance and background information to help educate current and future orthodontic trainees and educators as well as practitioners globally.

This book is an introduction to TADs and includes information about diagnosis and treatment planning, clinical applications, new appliances, and case reports on the use of TAD systems to achieve the best clinical outcomes while minimizing clinical failures. Being a by‐product of collaboration with around 113 contributors from around the world who are professors or clinicians deeply involved in writing peer‐reviewed journals and performing clinical researches regarding TADs, this textbook will also be translated into other languages. You can consider it as an international buffet of the most up‐to‐date knowledge of and experience with TADs!

Although it is certain that more layers of TADs are yet to be unfolded through continued progression in research and application of TADs by many brilliant practitioners, I hope this textbook will help demystify the fear of TADs and thereby promote a greater use of TADs in daily practice.

Organization

Section I: Fundamental Perspectives on TADs: This section contains an overview and the basic principles of TAD usage in orthodontics. It includes an in‐depth discussion of fundamental topics such as biomaterials, biomechanics, and histological and anatomical considerations as well as clinical topics such as diagnosis, treatment planning, and site selection for greater success with TADs.

Section II: Three‐dimensional Correction with TADs: This section discusses different orthodontic tooth movements in all three dimensions (sagittal, transverse, and vertical) that are now possible with the help of TADs.

Section III: Clinical Applications of TADs: The integration of TADs into various types of clinical orthodontics are explained in this section. Some examples are the utilization of TADs to replace missing teeth and to support limited or adjunctive orthodontic treatment, lingual orthodontics, and clear aligner therapy.

Section IV: Esthetic Control with TADs: This section describes TAD‐related techniques to enhance esthetic concerns such as midline deviation, canting of occlusal planes, facial asymmetry, gummy smiles, and unsatisfactory facial profiles.

Section V: Application of TADs in Surgical Cases: This section discusses the role of TADs in surgical cases.

Section VI: Complications with the Use of TADs: This section explains common complications and concerns regarding TADs that dental professionals should be aware of, including legal considerations.

Tips for the Reader

Within each section, each chapter is organized in such a way that you can capture a good overview of the topics at the beginning and then gradually gain deeper understanding as you read on. Chapters that seem to complement each

other are referenced within the text so readers can easily go back and forth between them as they wish. Therefore, if there are any unclarified questions from one chapter, you can expect to find more answers in other chapters of the same section or in correlating chapters of other sections.

While many cases presented in this book may seem repetitive/redundant, it was intentionally structured to include all possible alternatives for a given clinical situation as used and researched by different experts from around the world. This will keep you covered in case one method fails.

Lastly, please be advised that different writers have used different terminologies for the word “TAD,” such as orthodontic mini‐implant, miniscrew, miniscrew implant, microimplant, or temporary skeletal anchorage devices. Although there seems to be a good consensus among academicians that “temporary skeletal anchorage device” is the most correct terminology, I have chosen to use the well‐known terminology “TAD” in the book title due to its popularity. Within the text itself, however, various terminologies have been left in place in an effort to respect the individual contributor’s opinion regarding what these orthodontic devices should be called. Understand that, practically speaking, it was nearly impossible to come to a consensus on the terminology with over 100 authors.

Acknowledgements

I have had such a humbling experience working with my respected authors, the leading pioneers in contemporary orthodontics. I would like to express my sincerest appreciation to each one of them for patiently working with me to meet deadlines while striving to include all of the best state‐of‐the‐art TAD‐related techniques. I was also blessed to have a dedicated team of eminent reviewers who have worked very hard to structure, organize, and edit the contents. Each chapter has been reviewed and revised several times by reviewers such as Xingzhong (John) Zhang (DDS, MSD, PhD), Jun Sik Kim (DDS, MS, PhD, MS), Kyungsup Shin (MS, PhD, DMD, MS) and Janet Hojung Kim (DDS). My heartfelt gratitude to all of these reviewers. I would also like to extend my sincere gratitude to Dr. Kyungsup Shin for helping me with the project’s development, Mr. Wayne Kendall for his assistance in professional editing of the text, and Dr. Sun Kyong Yoo for professional editing of the images.

The publisher, Wiley, has made this book possible by taking up the mission and helping me to publish it. Special

thanks to Ms. Jayadivya Saiprasad and the entire Wiley editorial team for their endless support and help.

And last, but not least, I would like to express heartfelt thanks to my dear wife Jennifer, and to my son Steven, and my parents and sisters for the support and trust they have given me. I would also like to thank the executive administration, Dean Robert Trombly, and the entire team at A.T. Still University’s Arizona School of Dentistry & Oral Health and the marvelous folks in the Postgraduate Orthodontic Program for their endless support in the publication of this book and many other projects with which I am affiliated both internally and externally. I also would like to express my sincere gratitude to Provost Young-Guk Park, Professor Je-Won Shin, and Dean Kung-Rock Kwon at Kyung Hee University for their tireless support and help in making the publication of this book a success.

I hope our endeavors will greatly benefit our readers and their patients today and for years to come.

About the Editor

Jae Hyun Park, DMD, MSD, MS, PhD

Dr. Jae Hyun Park is Professor and Chair of the Postgraduate Orthodontic Program at the Arizona School of Dentistry & Oral Health. He is a Diplomate of and Examiner for the American Board of Orthodontics. Dr. Park has received several awards for scientific and clinical excellence including the Charley Schultz Award (1st Place Winner in the Scientific Category at the Orthodontic Resident Scholars Program) and the Joseph E. Johnson Award (1st Place Winner at the Table Clinic Competition)

from the American Association of Orthodontists (AAO). He also serves as an editorial board member of several peer‐reviewed orthodontic and dental journals including The Angle Orthodontist, Seminars in Orthodontics, and Journal of Clinical Orthodontics (JCO) as well as associate editor of the American Journal of Orthodontics & Dentofacial Orthopedics (AJO‐DO), Orthodontics & Craniofacial Research, World Federation of Orthodontists, and Journal of Clinical Pediatric Dentistry. He was recently invited to be a guest editor of Seminars in Orthodontics. While working as a full‐time faculty member since 2008, he has published more than 230 scientific and clinical articles in peer‐reviewed orthodontic and dental journals including five cover pages in the AJO‐DO, three cover pages in the JCO, two books, and 22 book chapters. He lectures nationally and internationally and represented the AAO at the 2018 American Dental Association Annual Session where he presented a three‐hour lecture. Dr. Park is currently Editor‐in‐Chief of the Journal of the Pacific Coast Society of Orthodontists (PCSO) Bulletin, Past President of the Arizona State Orthodontic Association, and Thesis Committee Co‐Chair of Northern California Edward H. Angle Society of Orthodontists. He also works for the National Board Dental Examination Part II Ortho‐Pediatric Dentistry/ Advanced Dental Admission Test Construction Committee and Commission on Dental Accreditation Site Visitor. Recently, he was also appointed to the 2021 Scientific Program Chair at the College of Diplomates of the American Board of Orthodontics annual meeting. In addition, he was recently appointed to replace Dr. Steven Dugoni as the American Board of Orthodontics (ABO) Director representing the PCSO. He will be the ABO President in 2024.

Section I Fundamental Perspectives on TADs

An Overview of Clinical Applications for Temporary Anchorage Devices (TADs)

Jae Hyun Park1,2 and Kyungsup Shin3

1 Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA

2 Graduate School of Dentistry, Kyung Hee University, Seoul, South Korea

3 Department of Orthodontics, College of Dentistry and Dental Clinics, University of Iowa, Iowa City, IA, USA

The advent of temporary anchorage devices (TADs) has enabled orthodontic clinicians to accomplish profound clinical solutions that were previously deemed inconceivable with traditional anchorage modalities. Orthodontic applications with TADs have come a long way since 1983 when the first clinical case demonstrated the possibility of “absolute” anchorage control in humans [1]. Various types of complex and challenging malocclusions can now be successfully treated using TADs. This chapter outlines some contemporary clinical applications for TADs to treat various orthodontic problems. The progress in TAD‐related research and potential future directions for TADs are briefly discussed.

1.1  Corrections in the Anteroposterior Dimension

The use of TADs is a compliance‐free alternative to traditional forms of anchorage control in orthodontic treatment. Of the three dimensions, TADs have been used most frequently to correct problems in the anteroposterior dimension. Typical treatment objectives include mesialization or distalization of a single tooth, multiple teeth, or maxillary/mandibular total arches.

1.1.1 Comparison with Conventional Methods for Anchorage Reinforcement in the Anteroposterior Dimension

A number of studies have evaluated treatment outcomes with TADs and compared them to conventional methods such as headgear, Nance appliances, reverse pull

headgear, and various distalizers [2–5]. Recently, a systematic review and meta‐analysis was reported that evaluated the treatment effectiveness of intraoral TADs and headgear for en‐masse retraction after premolar extractions [2]. In a review of 14 articles and 616 patients, TADs effectively enabled 1.86 mm more anchorage preservation by limiting mesial movement of maxillary first molars than did conventional methods using various types of headgear. A randomized clinical trial compared the effectiveness of three different methods including TADs, Nance appliances, and headgear [3]. In terms of maximum anchorage, there were no significant outcome differences in effectiveness for the three groups. The authors found, however, that patients had a superior comfort level with TADs and Nance appliances than with headgear. Patients also reported fewer problems with TADs than with either of the other two groups. A retrospective study compared orthodontic tooth movement after treating adult patients with maxillary dentoalveolar protrusion using TADs vs. headgear [4]. The authors highlighted the superior treatment outcomes with TADs compared to headgear in terms of greater maxillary anterior tooth retraction, less maxillary molar mesial drift, and shorter treatment time. A meta‐analysis compared the treatment effects of distalizers between TAD‐ supported pendulum appliances and conventional distalizers, such as pendulum appliances with Nance buttons [5]. Based on six studies, this meta‐analysis showed a higher average molar distraction using TADs (5.1 mm), which was significantly longer than that found with conventional appliances (3.3 mm). Also, premolar distalization averaged 4.0 mm with skeletal anchorage in contrast to 2.3 mm with conventional methods.

1.1.2 Functional Appliances and Auxiliaries

Combined with TADs

The introduction of TADs into orthodontics not only enables effective anchorage reinforcement with individual TADs, but also enhances the functionality of conventional orthodontic appliances when they are combined with TADs. For example, pendulum appliances anchored to the maxillary bone with TADs have achieved a similar amount of maxillary molar distalization to that of conventional pendulum appliances without TADs, providing significant premolar distalization in potentially less total treatment time and without the problem of anchorage loss [6]. For correction of Class III malocclusion with dental midline discrepancy, TADs can be used with sliding jigs (Figure 1.1) [7]. TAD‐supported Herbst appliances have significantly reduced unfavorable adverse treatment effects such as mandibular incisor proclination [8]. Placing a miniplate on the infrazygomatic buttress and linking it to the outer bow of a facemask has allowed protraction of the maxilla without any undesirable tooth movement that might cause unwanted arch length loss [9]. As an esthetic and simplified treatment option, a double J‐hook retractor and palatal TADs can be used to close extraction spaces by retracting the

maxillary anterior segment [10]. The use of a double J‐hook significantly reduced treatment time with the fixed appliances. Therefore, this might be a viable treatment option for patients who are reluctant to use conventional fixed appliances (Figure 1.2).

1.1.3 Miniplates Combined with TADs

Orthodontic miniplate anchorage systems have been used for various clinical applications. They are attractive options since they are independent of proximity to adjacent teeth and interradicular space limitations. In addition, since miniplates can withstand heavier forces than individual TADs, they have been used for rigorous orthodontic tooth movement such as total arch distalization. Total arch distalization with a palatal anchorage plate, when combined with tooth extractions, may be a feasible treatment option to achieve better facial esthetics without orthognathic surgery. This approach has been used as a successful non‐surgical correction of Class I malocclusion with severely protrusive soft tissue profiles by extracting four first premolars and applying total arch distalization (Figure 1.3) [11]. After making a series of modifications, these palatal miniplates have demonstrated successful

1.1  Class III correction with TADs and sliding jigs [7]. (a) Initial examination indicated full-step Class III canine and molar relationships. (b) TADs were placed and connected with a sliding jig. (c) Schematic illustration shows a miniscrew-anchored sliding jig and the direction of the force. (d) Final examination indicated Class I canine and molar relationships. Source: Tai et al. [7]. Reprinted with permission from Elsevier.

(a)
(b)
(d)
(c)
Figure

Figure 1.2  Class II correction with a double J retractor [10]. (a) Initial examination indicated a Class II Division 1 malocclusion with anterior crowding. (b) Schematic illustration shows a double J retractor and palatal TADs: palatal TADs (1, 2); anterior lever arm hooks (3); posterior lever arm hooks (4). (c) A double J retractor was connected to the TADs with elastomeric chains to achieve bodily translation. (d) Anterior tooth tipping can be controlled by adjusting the extension line of the force. (e) Maxillary anterior teeth were retracted and the extraction spaces were completely closed. (f) Maxillary anterior teeth were retracted and slightly tipped lingually. (g) Maxillary incisors were retracted after treatment. Source: Park et al. [10]. Reprinted with permission from Elsevier.

treatment outcomes with Class II malocclusion cases treated without extraction or severe bimaxillary protrusion with maxillary first premolar extractions [12, 13].

These palatal miniplates also demonstrated advantages when controlling distal tipping of the maxillary posterior teeth during distalization. A comparison study provided quantitative evidence that the palatal anchorage plate provided greater distalization and intrusion with less distal tipping of the first molar compared to conventional buccal TADs (Figure 1.4a–c) [14].

A recent follow‐up study evaluated the relationship between the amount of maxillary arch distalization with palatal anchorage plates and changes in the airway space. Whether the cases were treated with premolar extraction (3.4 mm of the maxillary first molar distalization) or with

non‐extraction (3.2 mm of the maxillary first molar distalization), there were no significant changes in airway volume or minimum cross‐sectional area of the oropharynx after maxillary arch distalization (Figure 1.4d) [15].

Miniplates have been placed on mandibular bodies to treat Class III malocclusions [16]. More recently, ramal plates have been placed in the retromolar fossa as a novel approach for retracting mandibular teeth or distalizing the mandibular total arch (Figure 1.5) [17, 18]. A finite element analysis (FEA) study verified that mandibular arch distalization with a ramal plate leads to greater distal and extrusive displacement of the posterior teeth and changes counterclockwise rotation of the occlusal plane compared to the same tooth movement using TADs in the buccal shelf or interradicular regions (Figure 1.5c) [19].

(a)
(e)

Figure 1.3  Class I correction with a palatal plate and TADs [11, 13]. (a) Initial examination indicated Class I malocclusion with the proclined maxillary incisors and protrusive lips. (b) A palatal anchorage plate was placed. (c) Retractive force direction can be controlled by engaging elastomeric chains at different levels of the hooks. (d) The mandibular arch was retracted using Class III elastics. (e) Maxillary and mandibular anterior teeth were retracted. Facial harmony and lip support were significantly improved.

Source: Kook et al. [11]. Reprinted with permission from Elsevier.

1.2

Corrections in the Vertical Dimension

1.2.1 Treatment for Dental and Skeletal Open Bite

A moderate to severe dental open bite, often in conjunction with a skeletal open bite, is regarded as one of the most challenging orthodontic problems to correct. The main applications of TADs for correcting anterior open bite are either intrusion of the posterior teeth or extrusion of the anterior teeth. For molar intrusion, TADs have been placed in various anatomical sites [20–22].

For open bite correction, TADs can be combined with a transpalatal arch (TPA) to provide efficient maxillary posterior tooth intrusion along with tongue exercise (Figure 1.6) [20]. Anterior open bite also can be corrected with TADs and miniplates (Figure 1.7) [21]. Miniplates were placed bilaterally in the zygomatic arch and the mandibular molar regions to provide absolute anchorage for bimaxillary molar intrusion. This approach can not only treat dentoskeletal open bite with positive overbite but can also achieve a counterclockwise rotation of the mandible. In lingual orthodontics, palatal

(b)
(c)
(d)
(e)
(a)

Figure 1.4  Comparison between a palatal anchorage plate and buccal TADs [14, 15]. (a) A palatal anchorage plate was placed for maxillary total arch distalization. (b) TADs were placed on the buccal side of the posterior teeth. (c) The palatal anchorage plate group showed greater distalization and greater intrusion with less distal tipping of the maxillary first molar and more extrusion of the maxillary incisor than the buccal TAD group. (d) No significant changes were found in the airway volume or minimum cross-sectional area of the oropharynx after treatment with these two groups.

TADs can be used to retract the anterior dentition and intrude the posterior dentition to correct anterior open bite (Figure 1.8) [22]. One advantage of this modality is that the proclination and intrusion of the maxillary anterior teeth can be controlled by adjusting the length of the crimpable hooks and the vertical locations of the palatal TADs (Figure 1.8c).

1.2.2 Treatment for Dental and Skeletal Deep Bite

Conventional modalities for incisal intrusion have relied on archwire mechanics. These traditional methods, however, often have the undesirable effect of labial torqueing the maxillary incisors. The introduction of TADs as an anchorage has made the complex tooth movement of

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