VITA All Ceramics

VITA In-Ceram®

YZ CUBES for CEREC®

M A C H I N A B L EC E R A M I C S

V I T A

Directions for useFabrication of bridge/crown frameworks

Preliminary e

dition

dated: 02.12.0

2

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Material-technical aspects of VITA In-Ceram® YZ Cubes for CEREC®

Zirconium oxide is an oxide ceramic material with numerous fascinatingproperties – from its translucency in case of thin walls and its bright color upto its excellent biocompatibility. Not without reason this material is widelyused in implantology. Additional features are the superior flexural strength amongoxide ceramic materials, the low modulus of elasticity and the fracture toughnessof the zirconium oxide. The latter results from the possibility of stabilizing ZrO2 inits denser high temperature phase through the appropriate addition of e.g. yttriumoxide. Only if external energy is supplied – as it occurs e.g. when a crack is formed –individual ZrO2 particles are transformed locally into their stable phase at room tem-perature. The compressive stress resulting in the structure avoids uninhibited crackgrowth and thus the failure of the ceramic – a behavior which creates astress and elongation progress which is otherwise only known from steel.This is why zirconium oxide is also referred to as "ceramic steel". This propertyalso ensures the high durability of zirconium oxide under permanent load.VITA In-Ceram® YZ Cubes for CEREC® are presintered (see fig. 1) zirconium oxideblocks partially stabilized with yttrium oxide. In this condition that allows easyprocessing they are used to grind enlarged bridge and crown substructuresin the CEREC inLab system. Then these structures are sintered (dense sinteringprocess) in a special high temperature furnace (see fig. 2) so that they shrinkand form highly stable and precision-fit structure which offer all physicalbenefits of zirconium oxide.

Important information:According to the information provided by Sirona Co., VITA In-Ceram YZ Cubesmay only be used in grinding systems with long traverse paths (from serial no. 5000)!The material can only be processed in Cerec 3/inLab, software update version1.40 R950 (or higher) of Sirona Co.

Indicationcrowns in the anterior and posterior area3-unit bridges in the anterior and posterior areaprimary crowns for telescopic work to be prepared

Counterindicationif sufficient oral hygiene is not presentin case of inadequate/inappropriate tooth preparationin case of insufficient hard tooth substancebruxism

Technical dataTEC (thermal exansion coefficient): 10,5 ·10-6 K-1

Flexural strength: >900 MPaFracture toughness (K10): 5,9 MPa·√mModulus of elasticity (E): 210 GPaComposition zirconium dioxide (ZrO2), yttrium oxide (Y2O3) 5%,

hafnium oxide (HfO2) < 3%, aluminium oxide (Al2O3)and silicon dioxide (SiO2) <1% (weight percentage)

Fig. 1: VITA In-Ceram® YZ Cubes for CEREC® inthe presintered state; magnification x 20,000

Fig. 2: VITA In-Ceram® YZ Cubes for CEREC® afterthe dense sintering process; magnification x 20,000

Clinical aspectsZirconium dioxide has been used in the field of hip-joint prosthetics for roughly30 years. It exhibits very high strength, high corrosion resistance and low thermalconductivity. The structure and the veneering material are both biocompatibleand do not have any allergic potential.

RadiopacityZirconium dioxide ceramic is radiopaque.

General preparation informationThe preparation can be carried out either using a chamfer or a shoulder preparationwith rounded interior angle. A circular cutting depth of one millimeter is required.The vertical preparation angle should be 3°, however, parallel preparation is also possibleif it is clinically required. All transitions from the axial towards the occlusal resp.incisal surfaces must be rounded.

Chamfer preparation

Incorrect chamfer preparation

Tangential preparation is counterindicated

Shoulder preparation

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Preparation of premolars and molars

In the case of posterior teeth a simplified occlusal relief should be preparedto provide more space for the ceramic. The aperture angle should be 120 – 140°.In the occlusal area at least 1.5 mm of substance should be removed.

1,0 mm

1,5 mm

1,5 mm1,5 mm

1,5 mm1,5 mm

1,0 mm

Preparation of anterior teeth

The incisal area of anterior teeth should be reduced by 2 mm.

1,0 mm

1,5 mm

2,0 mm

1,0 mm

1,5 mm

Fixation information

Restorations made of VITA In-Ceram® YZ Cubes for CEREC® are suitable for non-adhesive fixation with glass ionomer or zinc phosphate cements or adhesive fixationwith the self-hardening PANAVIA 21 TC or the dual-hardening PANAVIA F (Kuraray).

Pretreatment of the zirconium oxide restorations prior to adhesive fixation:

Sandblast the inner surfaces of the restoration usingaluminium oxide (max. 50 µm) at a pressure of = 2.5 bar. Avoid contactwith the cleaned surface.

Etching with hydrofluoric acid is not possible. Silanizing is not required.

Please observe the instructions for use of the manufacturersof the adhesive materials.

Removal of integrated restorations

To remove a fixed zirconium dioxide restoration it is recommended to usecylindrical diamond instruments whilst ensuring maximum cooling with waterand a speed of 120,000 rpm to separate the restoration.

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Trepanation

The veneering ceramic can be removed with a diamond instrument.Then the framework can be trepaned with a coarse-grained, spherical diamondwhilst ensuring maximum cooling with water and working at a speedof 120,000 rpm.

Scanning

Scanning in the CEREC inLab system is done analogously to the previous working steps.

The VITA In-Ceram® YZ Cubes for CEREC® bear a bar code which canbe read by a scanner. This way the shrinkage factor of the charge in use isscanned automatically and considered during grinding to achieve a finalresult with high precision of fit.

Constructing

Constructing in the CEREC inLab system is done analogously tothe previous working steps.

Design of the framework

Important:The default parameters for In-Ceram ZIRCONIA in the softwaremust be used for wall and connector thicknesses of restorations madeof VITA In-Ceram® YZ Cubes for CEREC®.

The average diameter of the connectors should not be less than 4 mm andmust be designed while observing the following two criteria:

1. Maximum value for height h must be selected.2. Height h should be at least as large as or larger than width b.

Important information:Please use suitable grinding tools for VITA In-Ceram® YZ CUBES for CEREC®

(e.g. cone-shaped diamond XL*).

After completing the grinding process and prior to sintering, the restorationis cut off using a diamond grinding tool, the cut-off area must be ground smoothand in some cases it may be required to reduce the thickness of the margin. After sinter firing, further adjustments must be avoided

* Sirona-Art.-No. 593 566 8 D3329

Bru

chla

st F

Verhältnis Höhe : Breite des Verbinders

Breite b

Höhe h

1:2 3:4 1:1 5:4 3:2

F

F

F

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Important note: Since grinding of sintered dental ceramic products includes the formation of dust,always wear a face mask or grind when wet. Additionally, use an extraction unit andwork behind a protective screen.

Sinter firing in the high temperature furnace Thermo-Star

Important information: Sinter firing is exclusively permissible in the high-temperature furnacesapproved by VITA. Only in this way perfect sintering with the resulting physicalproperties of the frameworks is ensured.

Switch on the furnace with the main switch (red rotary switch to "ON" position).

Open the furnace chamber with the "Open door" switch until the bottom ofthe furnace has been lowered completely. It must be ensured that the furnacetemperature is below 200°C (see temperature at the controller)

The ground anterior frameworks are placed on the aluminium oxide plate in the furnacewith the labial or lingual surface facing downward – posterior resp. bridge frameworkswith the occlusal surface facing downward – in a way to avoid damaging the margins.

Bridge structures require support if they lie hollow.

Cover with aluminium oxide crucible. Avoid the formation of gaps.

Temperature program on prog. 1 (switch to "1").

Start controller with "RUN" key.

Close the furnace ("Close door")

Switch on the heating switch (green switch at the heating)

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The sintering program runs automatically:

Heat-up rate 600°C / hourSintering temperature 1530°C, holding time 2 hoursCooling phase approx. 600°C / hour

Total time of the program cycles including cooling phase approx. 8 hours

The program can be interrupted or aborted by pressing the "RUN/HOLD" keyat the temperature controller approx. 5 sec.

Important:The furnace may only be opened when the furnace temperature is less than 200 °C!

Switch off the furnace with the main switch (red rotary switch to "OFF")

After sintering, the framework can be fitted on the die.

Reworking the sintered framework

Surface treatment/processing of dental ceramic materials is crucial for theflexural strength of the material. Reworking of sintered VITA In-Ceram YZ zirconiumoxide frameworks with grinding and milling tools must be avoided at any rate.Such work would create microcracks on the surface, which – in particular in the areaof the connector – would result in reduction of the strength caused by tensilestresson the completed restoration.

Important:Reworking should be carried out before sintering, if possible.Reworking of sintered objects may only be performed using a wet grinding systemand diamond grinding tools while exerting gentle pressure. Additionally,use an extraction unit and work behind a protective screen.

Hinweis:VITA In-Ceram® YZ Cubes for CEREC® must be veneered withVITA Verblendkeramik D 3D-MASTER (CTE (25 °C – 500 °C). Please adhereto the respective directions for use.

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Assortments - VITA In-Ceram® YZ Cubes for CEREC®

ZrO2 blocks for crowns Prod. No.Dimensions: 14 x 15 x 20 mmDesignation YZ-20

package cont. 5 pieces ECYZ205package cont. 25 pieces ECYZ2025

ZrO2 blocks for three-unit bridgesDimensions: 14 x 15 x 20 mmDesignation YZ-40

package cont. 2 pieces ECYZ402package cont. 10 pieces ECYZ4010

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Notices

Literature

Christel, P. et al: Mechanical properties and short-term in-vivo evaluationof ytterium-oxide partially-stabilized Zirconia.Jbiomed Mater Res 23, 45 (1993)

Filser, F. et al: Vollkeramischer Zahnersatz im Seitenzahnbereich.Quintessenz Zahntech 28, 1, 48-60 (2002)

Fischer, H. et al: Festigkeitsminderung von Zirkonoxid-Abutments Infolgeder Bearbeitung? Dtsch Zahnärztl Z 54, 7 443-445 (1999)

Geis-Gerstorfer, J.; Fäßler, P.: Untersuchungen zum Ermüdungsverhaltender Dentalkeramiken – Zirkondioxid-TZP und In-Ceram.Dtsch Zahnärztl Z 54, 692-694 (1999)

Kern, M.; Wegner, St.M.: Bonding to zirconia ceramic: adhesion methodsand their durability. Dent Mater 14, 1 64-71 (1998)

Lechner, J.: Fein raus mit Zirkonoxid.Zahntechnik Wirtschaft Labor 3, 26-29 (2001)

Luthard, R.: Stand und Perspektiven der Bearbeitung von Zirkonoxid-Keramik.Dental-Labor XLV, 12, 2187-2195 (1997)

Luthard, R. at al: Vergleich unterschiedlicher Verfahren zur Herstellung vonKronengerüsten aus Hochleistungskeramiken. State of the Art der CAD/CAM-gestützten Fertigung vollkeramischer Kronen aus Oxidkeramiken.Swiss Dent, 19, 6 5-12 (1998)

Luthard, R. et al: Festigkeit und Randzonenschädigung vonZirconia-TZP-Keramik nach simulierter Innenbearbeitung von Kronen.Dtsch Zahnärztl Z 55, 11 785-789 (2000)

Luthard, R.; Musil, R.: CAD/CAM-gefertigte Kronengerüste ausZirkonoxid-Keramik. Dtsch Zahnärztl Z 52, 5 380-384 (1997)

Marx, R. et al: Risparameter und Weibullmodule: unterkritisches Risswachstumund Langzeitfestigkeit vollkeramischer Materialien.Dtsch Zahnärztl Z 56, 2 90-98 (2001)

Reise, Michael: Das weiße Gold? ZWL 05, 32-37 (2002)

Stellungnahme DGZMK/DGZPW: Sind vollkeramische Kronen und Brückenwissenschaftlich anerkannt? Dtsch Zahnärztl Z 56 10, 575-576 (2001)

Stephan, M.: Beschichtungsverhalten von Verblendmaterialien auf Dentalkeramik.Diplomarbeit der Geowissenschaftlichen Fakultät, Tübingen (1996)

Tinschert, J.; Natt, G.; Spiekermann, H.: Aktuelle Standortbestimmung vonDentalkeramiken. Dental-Praxis XVII, 9/10 293-309 (2001)

Wegner, St.M.; Kern, M.: Long-Term Resin Bond Strength to Zirconia Ceramic.J Adhesiv Dent 2, 139-147 (2000)

Preparation diagrams on page 4 by Dr. Andres Baltzer, CH-Rheinfelden

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VITA Zahnfabrik H. Rauter GmbH & Co. KGPostfach 1338 · D-79704 Bad SäckingenTel.: +49/(0)7761/562-0 · Fax +49/(0)7761/562-299Hotline Tel.: +49/(0)7761/562-222 · Hotline Fax +49/(0)7761/562-446www.vita-zahnfabrik.com · www.vita-in-ceram.deinfo@vita-zahnfabrik.com

VITA In-Ceram® all ceramic materials areintegrated in the VITA SYSTEM 3D-MASTER.Shade compatibility with all components ofVITA SYSTEM 3D-MASTER® is ensured.

The unique VITA SYSTEM3D-MASTER® allows to systematicallydetermine and entirely reproduceall natural tooth shades.

1128E - 1202 (0.5) S

Please note:

Our products should be used according to the working instructions. We cannot be held liable for damages resulting

from incorrect handling or usage. The user is furthermore obliged to check the product before use with regard to its

suitability for the intended area of applications. We cannot accept any liability if the product is used in conjunction

with materials and equipment from other manufacturers which are not compatible or not authorized for use with

our product. Furthermore, our liability for the correctness of this information is independent of the legal ground and, in

as far as legally permissible, is limited to the invoiced value of the goods supplied excluding turnover tax.

In particular, as far as legally permissible, we do not assume any liability for profit loss, for indirect damages, for

consequential damages or for claims of third parties against the purchaser. Claims for damages based on fault

liability (culpa in contrahendo, breach of contract, unlawful acts, etc.) can only be made in the case of intent or

gross negligence. The VITA Modulbox is not necessarily a component of the product.

Date of issue of these working instructions: 12/02

With the publication of these working instructions all previous versions become invalid.

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The following products mentioned in these directionsfor use have been certified and bear the CE mark

VITA In-Ceram® YZ CUBES for CEREC®

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