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Dental CAD/CAM System

DentalPost Co. Ltd.


Composition of CAD/CAM system Scanner • high speed & high accuracy scan (scan time : 0.5min, accuracy : 15µm) • various scan (dies/stumps, inlays, bridge preparations, wax-ups, pontics, full casts, antagonists, implant position)

Milling Machine • high accuracy working (accuracy : 10µm) • available single block ~ 100Ø disc block • auto tool change system

Microwave Furnace • high speed sintering (1.5hr) • high density & high strength sintering • low power consumption (1KWh)

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Zirconia Block – NaturaZ

TM

NaturaZ is pre-sintered zircon-oxide blanks for the dental CAD/CAM system.

Why NaturaZ?

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Zirconia Block – NaturaZ

TM

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 FDA & GMP certified

제조업 허가번호 : 제2865호 제조품목 허가번호 : 제허 09-207 호 FDA : K091096

 Sintering Schedule * Sintering schedule by microwave furnace

* Sintering schedule by conventional furnace

Temperature

Main content

Temperature

Main content

Room Temp. ~ 1000℃

4℃/min

Room Temp. ~ 1000 ℃

80 ℃/min

1000℃ ~ 1500℃

2℃/min

1000 ℃ ~ 1520 ℃

100 ℃/min

1500℃

2Hr keeping

1520 ℃

15 min. keeping

Natural Cooling ~ 300℃

About 3Hr

Natural Cooling ~ 300 ℃

About 1 Hr.

Under 300℃

Out of Furnace

Under 300 ℃

Out of Furnace


Zirconia Block – NaturaZ

TM

4

 High strength & fracture toughness (Mpa) 14000 12000

(Mpa¡ m1/2)

10000 800

10

600

8 6

400

4 200

2

0 K

L

D

NaturaZ

Bending strength

Inceram

Emapress2

0

K

L

D

NaturaZ

Inceram

Emapress2

Toughness * Strength and toughness test of zirconia block in accordance with ISO 6872

 Aging property

ISO13356 maximum amount of monoclinic phase after accelerated aging

< 25%

residual biaxial flexure strength

> 500 MPa, and decrease not more than 20 %

* Aging test of zirconia block in accordance with ISO 13356


Zirconia Block â&#x20AC;&#x201C; NaturaZ Translucency Transmittance Data 0.6

NaturaZ block

0.5 T company block 0.4

%T

C company block

0.3 0.2 0.1 0.0 200

300

400

500

600

700

800

Wave length(nm)

Zirconia

Comparison of translucency as a function of wall (coping) thickness


Zirconia Block – NaturaZ

TM

5

 NaturaZ series

 NaturaZ standard blocks

 

• 65x35x14mm • 65x35x16mm • 65x35x18mm • 65x35x20mm

 Cerec compatible blocks

 

• 15.5x19x20mm • 15.5x19x39mm • 15.5x19x55mm

 Wieland compatible blocks

 

• 98Øx14mm • 98Øx18mm • 98Øx20mm • 98Øx25mm

 ZirkonZahn compatible blocks

 

• Transl. 1, 3, 5, 7, 9, 12, 16 • height : 16mm or 22mm

 

• 52x27x20mm • 12Øx26mm • 30Øx50mm • 38Øx60mm

 Cercon compatible blocks

* Custom order made blocks are available


Zirconia Block – NaturaZ

TM

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 Zirconia block manufacturing process • max. temperature : 1,800℃ • 2,000 disc available at once

• max. press : 300t • max. outer diameter : 400mm • max. length : 160mm

Press

Furnace

• max. press : 3t

• particle size : 200~250nm • manufacturing for optimal press material

CIP (Cold Isostatic Pressing) Spray Dryer


Microwave Furnace

7

 Max heating rate : 100째C/min  Max. Temp : 1600째C  Zirconia coping sintering time : 1.5hr Microwave Furnace heated to 1500

C in 20 min


Microwave Furnace

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 Smaller grains and less pores compared with conventional furnace

1500â&#x201E;&#x192;, 3h by conventional furnace

1500â&#x201E;&#x192;, 5 min by microwave furnace

 3M experiment data


Microwave Furnace

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 Advantage of microwave furnace

Microwave furnace

Conventional furnace

Heating rate

~ 100 ℃/min

~ 5 ℃/min

Maximum temp.

1600 ℃

1600 ℃

Retention time

Less than 30 minutes

More than 2 hours

Particle size

Very fine grains (rapid heating & short time sintering)

Grain growth (long time sintering)

Density

Fine structure

Pore remains

Furnace size

1/10 vs. conventional

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Power

1/50 vs. conventional 220V or 110V socket

Extra electric installation needed

Cost

Similar to conventional

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Endmill – Supercut

TM

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Supercut is a endmill for dental CAD/CAM system

round shape designed for smooth chip exhaust sharp edge for fast cutting

 Maintains a high-precision form even during long-term use  Long life with new diamond coating technique (our own technology)  Applied Unique design technology

diamond coating

• Chip exhausted Smoothly in working • Tool shape is designed for diamond coating


Endmill – Supercut

TM

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 Diamond coating

Diamond coating ti ut l c ea Id

10000

Hardness (Kg/mm2)

Diamond film is the best protective coating for cutting tool because of its highest hardness. (Table 1) The excellent thermal conductivity (Table 2) of diamond can be applied to the heat sinks. Since the mass production of diamond coating is yet to be solved, the price is still very high, which hinders wider application of diamond coatings. However, the new diamond coating technique of Dmax, deposition of diamond through graphite decomposition, can deposit much wider area with higher deposition rate, which enables considerable cost reduction from previous diamond coatings by conventional CVD techniques

ng

m ol to

e at

ria

l

PCD CBN CBN

5000

Al2O3

SI4N4

WC-Co High speed steel

100

200

300

400

500

Strength (Kg/mm2)

Table. 1

Thermal conductivity (W/cmK)

Table. 2


Endmill â&#x20AC;&#x201C; Supercut

TM

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 Diamond coating

Surface view of diamond coating

Fracture view of diamond coating

Raman spectroscopy of diamond film


Endmill â&#x20AC;&#x201C; Supercut

TM

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 Type of product (example)

Unit (mm) Radius of Ball Nose

Effective Length

Length of Cut

Neck Diameter

Overall Length

Shank Diameter

R

l2

l1

d2

L

d

SPRB03012 SPRB03016 SPRB03020

R1.5

12 16 20

4.0

2.85

50 55 60

3 4 6

SPRB02512 SPRB02516 SPRB02520

R1.25

12 16 20

3.0

2.40

50 55 60

3 4 6

SPRB02012 SPRB02016 SPRB02020

R1.0

12 16 20

3.0

1.95

50 55 60

3 4 6

SPRB01012 SPRB01016 SPRB01018

R0.5

12 16 18

2.0

0.95

50 55 60

3 4 6

Model No.


Milling machine – ProDen / ProDia  Photos of mechanical parts

 Advantage of ProDen/ProDia • The optimal choice can be made, considering the customer’s environment, out of various models with five, four, and three-plus-one points, and with different specifications. • ATC can attach up to eight tool magazines. • Wet basic attachment with refrigerant/lubricant possible • A large-scale chamber for full-bridge processing can be attached. • Fast and stable aftercare and upgrades available at a low cost • An open system where the type or make of blocks, tools, scanners, CAD/CAM S/W, or furnaces does not matter • High-precision 14-hour fully automated processing possible • One tool can process up to 100 copings. • Various block-securing jigs and immediate counteraction are possible, according to the specifications demanded by the customers.

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Q&A  Guide of Tooth Preperation of Zirconia

Single Tooth Preperation


Milling machine – ProDen / ProDia

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 Specification ProDen

ProDia

Division A-11

A-48

3+1 Axis

4 Axis

(A axis 180°)

(A axis 360° free)

100

120

180

100

180

150

100

100

110

350W

350W

350W

Max40,000rpm

Max50,000rpm

Max50,000rpm

(collect chuck ø3~6)

(collect chuck ø3~6)

(collect chuck ø3~6)

350W

3kW

500W

Max50,000rpm

Max70,000rpm

Max50,000rpm

(collect chuck ø3~6)

(collect chuck ø3~6)

(collect chuck ø3~6)

ATC

3

8

4~6

Controller

Own Controller

Own Controller

Own Controller

Size and Weight

H1590XW580XD1050(180kg)

H1590XW580XD1050(180kg)

H780XW600XD700 (85kg)

80X40 rectangular

Ø100 circular block,

Ø100 circular block,

block (Max)

100X100 rectangular block

100X100 rectangular block

AC220V±10% 60Hz

AC220V±10% 60Hz

AC220V±10% 60Hz

Control Axis

Axis Range

M45 5 axis

Main Spindle

Block Size Power

ProDen A-48

ProDen A-11

ProDia M-45


Q&A  Processing before Milling in Cerec

*Z2260DF


Q&A  Processing after Mimling ( in case of Dry milling) • Caution, ceramic dust: Aspirate all dust and air with a fine dust filter commonly used in the dental lab. Use protective goggles in all framework processing work. • In order to prevent contamination, the blank must not be exposed to water or any other liquids, fats (hand lotion) or oils during processing.

 Finishing of Blank surface before Sintering • The presence of notches and sharp edges or damage on the bottom side of the interdental connectors may substantially reduce the stability of the sintered framework. These surfaces should be smoothed in the green state! • We recommend the use of a turbine handpiece to remove the framework due to the lower degree of vibration as compared to other handpieces! • If no turbine is available, fine cross-cut tungsten carbide cutters can also be used - rotary speed ≤ 20,000 rpm!

 Cleaning of the Framework • To ensure even coloring, the framework must be clean, free of oils and completely dry prior to dyeing! • Touch the framework only with clean, non-oily hands. • Use a soft brush, e. g., Kolinski brush for layered ceramic, size 6, to clean thoroughly the entire framework, including the interior surfaces of the coping, from milling dust.

 Finishing the Sintered Framework • Finish sintered frameworks using a turbine at 30,000 to 120,000 rpm or with a fastrunning handpiece at up to 30,000 rpm. • The use of any water cooling which is available can always be recommended, but is not necessary for selective adjustments. • Use only fine-grain diamonds with grain sizes between fine 30 µ (red) and extra-fine 15 µ (yellow). • To avoid overheating the framework, apply only light pressure and smooth a particular place for only a short time. • If there is cervical smoothing, whether intentionally or accidentally, on a connector, the position must be polished again. - Diamond-equipped rubber polishers, discs or cones, are suitable for this, coarse = blue, medium = pink, fine = gray (high polish).


Q&A  Framework Design • Generally speaking, the coping wall thickness must not be less than 0.5 mm. There are the following exceptions: – Anterior copings ≥ 0.3 mm, but not in cases of bruxism. – Abutment tooth coping to the cantilever bridge unit for posterior teeth ≥ 0.7 mm. – Abutment tooth coping to the cantilever bridge unit for anterior teeth ≥ 0.6 mm. • Connector cross-sections must not be less than shown below. – Anterior tooth: Bridge unit(pontic) – bridge unit 7㎟ Die – bridge unit 6㎟ Die – die 6㎟ Die – cantilever bridge unit 8㎟ – Posterior tooth: Bridge unit – bridge unit 10 ㎟ Die – bridge unit 9㎟ Die – die 7㎟ Die – cantilever bridge unit 12 ㎟



CTE ( Coefficients of Thermal Expansion ) • CTE of Zirconia Frame • CTE of Natura-Z

approx. 10 ppm(ⅹ10-6/℃) approx. 10.5~11 ppm

• Venner Ceramic must be have the same or lower CTE. • Recomanded Ceramic powder for veneering : E-max, Lava-Ceram, Hera-Zir, etc ( Their CTE are approx. 8~10 ppm )


Q&A  Porcelani - Zirconia Bonding Mechanism

MECHANICAL 25%

50%

CHEMICAL

THERMAL

25% CONTRACTION

Bonding Mechanism Porcelain-Metal

Chemical > Mechanical > Thermal

Porcelain-Zirconia

Mechanical + Thermal â&#x2030;&#x2C6; 100%


Q&A  Schematic of Glass-infiltrated Zirconia

Special Glass

Zirconia

(Sand-blasting)

Zirconia

Zirconia

Body Porcelain

Zirconia


Q&A  Surface treatment with liner Barrier

Zirconia without surface treatment

Zirconia+porcerin+Îą

15~20um


Q&A  Comparison of Bond-Strength after build-up on Zirconia coping


Q&A  Temporary Cementation • If you are planning to use a composite cement to cement the restoration permanently, a eugenol-free luting cementmust be used for the temporary cementation. – Residuals of products containing eugenol inhibit the setting of composite cement during the permanent cementation process! • If you are planning to use a conventional cement to seat the restoration permanently, you may use eugenol-free temporary luting cements or such containing eugenol

 Permanent Cementation • Thoroughly clean the restoration and blast the interior surfaces of the crowns with aluminum oxide ≤ 40 µm. • For Cementation of Frame zirconia on tooth, adhesive cementation is not absolutely necessary. • Conventional Cementation - In case of conventional cementation we recommend the use of glass ionomer cement, e.g. - The use of phosphate cements fail to provide the desired esthetic results. • Self-adhesive cementation - Recomanded cement : Unicem (3M), Super bond, etc - For cementation with the self-adhesive universal composite cement like the RelyX™ Unicem, and Super bond. • Adhesive cementation with composites - For the adhesive cementation with composite cements, the adhesive surfaces must be silicatized with Rocatec™ Soft or Cojet™ sand for 15 sec and silanized with ESPE Sil. - If desired, a ‘fit test’ has to be done before silicatization/silanization. - For details on processing, please refer to the Instructions for Use of the Rocatec™


Trouble Shooting Error

Cause  

Coping breaks during removal from the holding structure.

Holding pin was separated too far from the object.

Solution   Separate closer to the object to reduce vibrations.

  Handpiece wobbles.

  Check the handpiece. Use a turbine, if available.

  Cutter is blunt.

  Use a new cutter.

 

Ensure proper positioning during sintering as described under “Positioning for Sintering”.

  Die was not placed correctly on the model.

 

Prior to scanning, check the proper position of the die on the model.

  The preparation guidelines were not observed.

  Contact dentist/customer, rework model as necessary.

  Inadequate model preparation.

Observe the model in the guidelines Scan operating instructions.   Rework the framework as necessary and contact the customer, or do the work again..

 

Erroneous positioning of crowns and bridges during sintering.

Framework does

 

Not all of the data for the die surface was captured during scanning (causing gaps in the data)

 

Contamination on the coping surface.

 

The dyeing liquid was used too often and is contaminated.

  Do not use the dyeing liquid for more than 24 hours!

Whitish spots apparent on the coping surface.

  Milling dust was not removed.

Use Scan Spray before scanning. Depending on the scale, rework the framework or create a new one.

  Carefully remove all milling dust prior to dyeing.


Zirkonio Cad-Cam System