manual coritec - agc new · pdf filemanual coriteczr version 2.0 1 manual coritec zr for the...

Manual CORiTEC Zr Version 2.0

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Manual CORiTEC Zr

For the Construction and Production of CORiTEC Zr Framework


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© imes - icore GmbH All rights reserved

imes - icore GmbH Im Leibolzgraben 16 D-36132 Eiterfeld

Phone.: +49 (0) 6672 898-460 Fax: +49 (0) 6672 898-461 eMail: [email protected] web: www.imes-icore.de

http://www.icoredental.com/


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Contents

1. Advice on construction ...................................... 4

2. Positioning of object in the blank ........................ 7

3. Attachment of bars and drops ........................... 9

4. Positioning of object in the blank .......................11

5. Colouring the framework ..................................14

6. Sintering the framework ...................................16

7. Trimming the framework ...................................17


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1. Advice on construction

Preparation Before you start to work, check that the tooth has been appropriately prepared for ceramic restoration, in particular with - a well- defined chamfer or rounded shoulder preparation. Unsuitable preparations can lead to failure. For detailed instructions please see the PreparationGuide.

Framework wall thicknesses Although it is possible to produce more space saving restorations - anteriors: 0,4mm - posteriors: 0,6mm - all abutment teeth: 0,6mm The framework should be designed in an anatomical form with extra support in the cuspal region so that an even layer of 1-2 mm bonding ceramic can be build up.


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Connection Design When constructing the connections ensure of a substantial cross section. The height of the connection is more important than the width. Double the width means only double strength, whereas double the height means 8 times the strength. For this reason, the ideal connection is an oval cross section.


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The relevant connection cross sections can be found on the table Recommended Framework Thickness

Gerüstspannweite

Die Spannwei The connection to a coping or pontic should be designed as rounded as possible. In general, try to avoid edges or sharp corners.

Recommended Framework Thickness

connection

cross section [mm²] OK/UK

wall thickness

[mm]

Single Crowns - 0,4

Anterior single crowns connected 5/4 0,6

Posterior single crowns connected 9/9 0,6

Telescope - 0,5

Anterior bridge 3 units

7/6 0,6

Anterior bridge 4 units

7/6 0,6

Premolar anterior bridge 3 units

7/9 0,6

Premolar anterior bridge 4 units

9/12 0,6

Posterior bridge 3 units

9/12 0,6

Posterior bridge4 units (2

premolars)

12/14 0,6

Posterior bridge 4 units (2 Molars)

16/18 0,6


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2. Positioning of object in the blank

Horizontal Positioning In order to work as economically as possible, place the pieces of work to be milled close together on the disc. Place larger bridgework with the arch preferably parallel to the edge of the blank. The distance to the edge of the blank should be approx. 1mm. Ensure that the areas of blank between single copings remain joined in one piece, otherwise there is a danger that the work pieces may break out during milling. In some cases is it acceptable to allow the milling surfaces to overlap slightly.

Rules for bridges of 8 units and more. With large spanned bridges always ensure that the area between the end units and the oral arch is not broken by other objects. The distance of other objects to the oral arch must be 5mm.


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Vertical Positioning of the object in the blank

The distance from the framework to the blank surface must not give a negative value, if this is so, than the framework is to big for the blank. As the machine is driven with greater strength from the cervical region, it is practical to position to position the work pieces as hight as possible. If the piece of work has Drops attached than the vertical distance to the blank surface should be adjusted to approx. 1mm. In lots of cases it is necessary to increase this vertical distance.

1mm


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3. Attachment of bars and drops

- Bars The Bars are the support rods which connect the framework to the blank. They create a stable connection between the framework and the blank during the milling process. In larger structures with more than seven units, the bars also have stabilizing effect during sintering. - Drops The Drops are the vertical pins on which the framework stands during sintering. The Drops support the structure and prevent deformation. - General rules on attaching Bars and Drops The Bars and Drops should have a diameter of 2mm. Bars always lie horizontally and in vertical direction to the flow of the bridge, with the exception of single copings. The amount of Drops and their location must be selected so that the work piece may stand securely during the sintering process. A minimum of three Drops must be attached.

∙

Ø = 2mm


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Single crowns - 3 Bars must be attached - No Drops are required

Rules for bridges with up to seven units - Bars a) End units must have 2 Bars –

oral and vestibular. b) All other units require one Bar

each, alternating oral and vestibular. require

c) Larger pieces of work can also

have additional Bars. - Drops

d) 3- unit anterior bridges do not require Drops. Posterior bridges must always have Drops. e) End units must always have one Drop. f) Pontics and molar copings must have always one Drop. g) Premolar and anterior copings can be left out, however at least every second unit must have a Drop. h) Drops must be attached alternating in and oral and vestibular region. The Drops should not be placed directly on the edge of the occlusal surface.

Rules for bridges with 8 units and more - In additional to the above rules the following applies:

The first and last units and the framework must have a Bar attached in the oral region, vertical to the flow of the bridge.


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4. Positioning of object in the blank

Smaller objects (1 to 7 units) can be completely removed from the blank before sintering. A turbine without water cooling is suitable for separation. First each Bar is cut halfway in order to create fractures. Then the Bars are completely cut and separated. The remains of the Bars are trimmed using the turbine.

Rules for bridges with more than 8 units Large spanned bridges must not be completely removed from the blank, instead they are sintered whilst still joined from the oral region to the blank. With large spanned bridges the amount of Bars remaining depends upon the curve of the bridge (arch). The following rules apply: The Bars should only remain attached to matching units. Bars shoul either remain attached to copings or to pontics. If possible the Bars should remain to the end units. If the end units are not the same, then the Bar should be attached to the next matching unit. It is possible to leave two Bars attached if the bridge is roughly symmetrical , i. e. the same number of units n each quadrant. These Bars remain attached according to the first two rules, to the end units. Three Bars remain attached if the bridge is assymetrical, for example if the bridge spans from 33 to 46. Two of the Bars remain attached according to the first two rules, to the end units. The third Bar remains attached to another unit.

Pontics

Abutment teeth


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Examples of possible situations

Situation Example Instructions

12 units, symmetrical

2 Bars end position, oral

11 units, roughly symmetrical


10 units, asymmetrical

2 Bars end position, oral 1 Bar within the arch, oral

Distance from bridge to the blank surface 2mm

9 units, asymmetrical, cantilever pontic

1 Bar end position oral 1 Bar orally attached to the coping next to the cantilever

bridge 1 Bar within the arch, oral

Distance from bridge to the blank surface 2mm

8 units, asymmetrical

2 Bars end position, oral 1 Bar within the arch, oral

One quadrant



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The following pictures show the preparation of a 14 unit bridge for sintering:

1. The bride directly after having been milled.

2. First the vestibular Bars are cut using a turbine.

3. Bridge with vestibular separated Bars.

4. Next the labial arch is removed using a separating disc

5. Bridge without labial arch.

6. Now the back of the blank is removed using a separating disc.

7. Bridge without the back end of the blank

8. The rest of the vestibular Bars are removed using a turbine.

9. Finally the Bars in the oral region are removed using a turbine, with the exception of the Bars required for sintering.

10. The bridge ready for sintering.


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5. Colouring the framework

Please, additional read the instruction from the CORiSHADE Shading Set! The CORiTEC Zr frameworks must be absolutely dry, clean and grease- free before CORiSHADE is used. If this not insured, failures might be result. If you are not sure whether the framework is absolutely grease- free, clean and dry, make in each case a cleaning bake according to the following parameters:

Startemp. [°C]

Drying time [min]

Heat rate [°C/min]

End-temp. [°C]

Holding time [min]

550 6 35 710 4

Dyeing should be performed in environment which can be ventilated well. The different colours can be achieved with appropriate changes of the concentration. Other colour can be achieved with appropriate changes of the concentration. E. g. the colour A 3,5 with is reached by 87,5% concentration. Shake the liquid bottle well before use! The colouring liquid has to be filled over from the original CORiSHADE bottle into the dyeing containers (fig. 1) For dyeing, the unsintered framework is placed carefully with the tweezer (supplied with the CORiSHADE shading set) in one of the dyeing containers. In order to prevent micro cracks, the tweezers must be handled with little pressure. Never use metal tweezers or metal containers.

Possible colours Concentration of solution [%]

A4, B4, C4, D4 100

A3, B3, C3, D3 75

A2, B2, C2, D2 50

A1, B1, C1 25

fig. 2 fig. 1


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The zirconia framework should be covered perfectly with liquid and must remain immersed for 2- 5 minutes. In order to support the dyeing process, you might place the dyeing container with the zirconia frame in a pressurized pot. Take care, that the maximum pressure does not exceed 2 bar. Subsequently, the framework is inferred from the container and dabbed with a clean tissue up to an even colour. The zirconia framework must be sintered only in absolutely dry condition. Therefore the zirconia frames must be predried with the following parameters:

Drying temp. [°C]

Drying time [min]

60 - 80 app. 30

Afterwards the sintering process can be started. Please consider the following recommendations as fact: You should

Never dilute CORiSHADE liquids with alcohol!

Clean CORiSHADE colorized frameworks with water or alcohol!

Never use compressed air for drying!


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6. Sintering the framework

The sintering process takes place in the i-SINT M2 / Austromat µsic furnaces. When sintering CORiTEC ZR select the program 1. Single crowns and small bridges without Drops are placed on the labial or occlusal surface for sintering. All other framework is placed onto the Drops. If the framework has been previously coloured with CORiSHADE, then ensure the surface is thoroughly dry before sintering! Observe the instructions for use for CORiSHADE. It is essential to use one of the two trays available for sintering. The framework is entirely covered with the flame proof cover. Turn the sintering tray over after each use. Please read the additional the instructions from i-SINT M2 / Austromat µsic.


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7. Trimming the framework

The densely sintered CORiTEC Zr framework should only be mechanically trimmed if absolutely necessary. If required, use only water cooled, diamante sintered burs, otherwise the material could overheat and cause cracks to occur. Please observe the following rules:

- The thinner the wall thickness, the more must be taken.

- The minimum wall thickness mentioned in Tab. Recommended Framework Thickness must be maintained.

- Trim carefully, only use gentle pressure.

- Only use diamond sintered burs which are in excellent condition.

- A bur with reduced cutting performance generates heat.

- Use mainly burs with a grain size of over 100 µm.

- Use burs with less than 100 µm only for finishing the edges or for detailed work on the surface.

- Avoid grinding the interdental connections and especially avoid carving notches in the basal area.

- Avoid sharp edges, try to maintain round surfaces.

- Clean the framework with water only. It is not advisable to sandblast.

- Use only ceramic for Zirconia.

manual coritec - agc new · pdf filemanual coriteczr version 2.0 1 manual coritec zr for the...

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