Porcelain Veneering the Zirconia by Phibo · 2015-02-26 · CAD-CAM 4 1. Preliminary Considerations...
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Protocol Porcelain Veneering on Phidia ® , the Zirconia by Phibo ® Phibo ® CAD-CAM We decode nature.
Transcript of Porcelain Veneering the Zirconia by Phibo · 2015-02-26 · CAD-CAM 4 1. Preliminary Considerations...
ProtocolPorcelain Veneeringon Phidia®, the Zirconia by Phibo®
Phibo®
CAD-CAM
We decode nature.
CAD-CAM
2
CAD-CAM
3
1. Preliminary Considerations 4
2. Devices 6
3. Procedure 7
4. Observations 8
5. Material: Zirconia Phibo® 9
Table of contents
CAD-CAM
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1. Preliminary Considerations
To successfully fuse porcelain veneering onto Phidia®, the Zirconia by Phibo®, the following aspects of the design of the structure should be taken into consideration:
w The structure reproduces the final shape of the reduced piece, as the design may influence the success or failure of the ceramic restoration on Zirconia.
w The structures have to be designed with compensation (fully ana-tomical design with reduced final volume adapted to the ceramic coating). The thickness of the porcelain covering the surface of the structure must be uniform.
w The minimum thickness of Phidia® structures must be 0.2 mm on the marginal line, and 0.5 mm for the rest of the piece for screw-retained structures, and 0.5 mm over the whole piece for cement-retained struc-tures.
w When designing structures with more than one piece, ensure bond stability in areas between the abutments and pontics. The minimum cross-section for the connectors should be 9 mm2.
CAD-CAM
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w Make sure that the CTE (coeffi cient of thermal expansion) of the porce-lain coating is similar to that of Phibo® Zirconia (CTE: 11,4 x 10-6 K-1).
w The structure should not be retouched.
w Phidia® structures should not be sandblasted, as this procedure could cause phase changes and result in surface tensions that may cause cracks in the long term.
w If it is absolutely essential to retouch and/or sandblast a structure, prevent any adverse effects by only using tools for Zirconia and/or fi ne-grain diamond burs and sand-blast with aluminium oxide of a maximum of 125 µm at no more than 4 bar pressure. On completion of the retouch or sand-blasting, the structure should be heat treated at 1000°C during 15 minutes to revert the phase transformation and restore the initial properties of the material after sintering.
w The required conditions of cleanliness must be maintained to prevent contamination of the structure during the process.
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Porcelain kiln
Steam machineDiamond burs
and silicone tips
Porcelain (Wash / Dentin / Incisal)
2. Devices
CAD-CAM
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Step 1
Clean the Phidia® structure with steam. The structure must be free of grease and grime. Once clean, prevent any contamination.
Step 2
Preparatory wash: Apply the preparatory coat (Wash) to the structure and fi re it according to the porcelain manufacturer’s instructions.
Step 3
1st fi ring for dentin and incisal: Apply dentin and incisal and fi re according to the porcelain manufacturer’s instructions.
apply fi ring
3. Procedure
apply cocción
apply fi ring
Step 4
2nd fi ring for dentin and incisal: Apply dentin and incisal and fi re accor-ding to the porcelain manufacturer’s instructions.
Step 5
Finish: Revise and polish the restoration with diamond burs. Apply glaze and cosmetics and fi re according to the porcelain manufacturer’s instruc-tions.
Step 6
Final result: The fi nished piece in the model.
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w The best results are achieved when the CTE of the porcelain coating is slightly lower than the CTE of the structure material.
w The thickness of the porcelain layer must be even over the entire coated surface.
w The thickness of the porcelain layer should not exceed 2 mm. The ideal thickness is between 0.7 and 1.2 mm.
w Reduce any residual thermal stress present in the porcelain coating, particularly in large restorations with considerable material thick-ness, by means of slow cooling after the last firing process.
4. Observations
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ZrO2 (Tetragonal zirconium oxide, partially stabilised with Yttria, Y-TZP) Phidia® by Phibo® complies with Medical Device Directive 93/42/EEC Type II Class 2b, 4, 5, 6 (Classification as per ISO 6872:2008 standard).
CHEMICAL COMPOSITION
ZrO2+Hf2O3+Y2O3 > 99
Y2O3 4.5 < 5.4
Hf2O3 ≤ 5
Al2O3 < 0.5
Other oxides < 0.5
PROPERTIES UNITS VALUE
Density ρ (g/cm3) 3.5
Coefficient of thermal expansion (CTE) α (K-1) 11.4 x 10-6
Vickers hardness of sintered disks GPa 13 (1326 HV)
Microstructure: grain size µm 0.60
Solubility µg·cm-2 < 100
Radioactivity Bq·g-1 238U, 232Th < 0.03
Flexural strength of sintered discs MPa 950-1100
5. Material: Zirconia Phibo®
Porcelain Veneering on Phidia®, the Zirconia by Phibo®
Protocol
Este documento ha sido revisado y aprobado en 2014-12-10.
REF: PROTCERPHIEN_rev001
We decode nature.www.phibo.com
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