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CLASS 2 MALOCCLUSON

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INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com

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CLASSIFICATION OF CLASS II MALOCCLUSION

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PURPOSE OF CLASSIFICATION • To

localize and quantify any possible skeletal contribution to class2 malocclusion •To identify dental displacement associated with the class2 malocclusion. •To assign the patient to one of the class2 types

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MOYERS CLASSIFICATION 

Six Horizontal types

Five vertical types

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HORIZONTAL TYPES      

Type A Type B Type C Type D Type E Type F

Normal skeletal ,but class2 dental

Syndromal types of class2

Mild skeletal features

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TYPE-A (Dental class2) 

Normal skeletal profile Mand dentition placed normally to its base Max dentition is protracted resulting in class2 molar relation Increased over-jet and over-bite

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TYPE-B (Max excess)

Mid-face prominence Normal mandible

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TYPE-C Retrognathic max and mandible Smaller facial dimension Dental protrusion More in females

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TYPE-D Max and mand retrognatism Max dental protrusion

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TYPE-E Max prognathism and dental protrusion Mand dental protrusion

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TYPE-F It is a large heterogeneous group with mild skeletal class2 tendencies It is a milder form of types B,C,D,E.

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VERTICAL TYPES ď Ź

The five vertical types are not as clearly differentiated as the four syndromal horizontal types

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TYPE-1 (Steep mandibular plane or high angle case)  Mand

plane and occlusal plane are steeper than normal  Palate tipped down ACB tipped up

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TYPE-2 “ Square face”

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MP,PP,OP and ACB are more horizontal


TYPE-3 

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PP tipped up ant Dec ant face ht Open bite


TYPE-4 

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PP,MP,OP all are tipped down leaving lip line high Horz B


TYPE-5 

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PP tipped down ant Deep bite


Skeletal

CLASS 2 Dental

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A skeletal Class II - fault with the maxilla www.indiandentalacademy.com


A skeletal Class II - fault with the mandible www.indiandentalacademy.com


A skeletal Class II - vertical www.indiandentalacademy.com


DENTAL CLASS-2 ď Ź

Maxillary Dental protrusion

ď Ź

Mesial drift of the maxillary first permanent molars Congenital disease or loss of the primary teeth Ectopic molar eruption Interarch tooth size discrepancy

Affects only lips www.indiandentalacademy.com


Primary dentition Pre-adolescents Treatment of class 2 Adolescents

Adults www.indiandentalacademy.com


Pre school children (primary dentition)

Flush terminal

Distal step

Mesial step

Mandibular deficiency can be recognized by age 3 www.indiandentalacademy.com


Growth modification can be used to correct distal step easily As growth continues the discrepancy tends to recur as quickly as it was corrected.( both AP and Vertical skeletal discrepancy) Except in most severe case it is unwise to begin treatment

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Treatment of pre-adolescent children's

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In early years of 20th century Pressure against growing face( head gear )

• Angle introduced class 2 elastics to position mandible forward •At later stage in US fixed guide planes were used to force pts to advance the mandible upon closure With advent of ceph it became clear that both elastics and guide planes corrected www.indiandentalacademy.com class2 by mand dental protrusion


Head gear was re-introduced in 1940s ceph analysis clearly demonstrated not only retraction of upper teeth but also effects on max growth

In Europe efforts to stimulate mandibular growth led to the devt of a family of “functional appliances”.

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Thank You www.indiandentalacademy.com Leader in continuing dental education

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Class2 malocclusion/ dental implant courses by Indian dental academy