Veneering of fixed appliences - semmelweis.hu€¦ · Staining or layering n Stain and glaze...

Veneering of Fixed Partial Dentures

Shade selectionShade

communication Shade reproduction

How to tell?

ESTHETIC FIXED PARTIAL DENTURES

SHADE FOR FPDü Treatment planningü Shade selection, patient approvalü Communicationü Interpretationü Verification

Staining or layeringn Stain and glaze

techniquen Monolithic- fabricated in full

contour from a single block of material.

n weakest link in traditional PFM’s and other ceramic restorations is the porcelain layer over the substructure.

n In many cases the porcelain can chip or fracture from the substructure and ultimately cause the restoration to fail. Monolithic crowns have no suchweakness.

n Veneeringn Layeringn better esthetics n high translucence and lifelike

esthetics

Ceramic veneering/layering

The bonding of ceramic materials to alloys follows four principles:¨Shrinking the ceramic onto the metal frame - coefficient

of thermal expansion¨ Chemical bond The bond is formed by means of

oxygen bridges between the silicon atoms of the ceramic and the metal oxides of the alloy.

¨Mechanical retention is created through finishing and blasting of the frames-surface enlargement also takes place.

¨Bonding through adhesion takes place via intermolecular forces (VAN DER WAAL forces)

Hajdu Zoltán ftm

opaqueBase dentin

opaque dentin

dentin clear fluor-escence

enamel

Hajdu Zoltán ftm

Hajdu Zoltán ftm

Hajdu Zoltán ftm

All ceramic

Veneering

n Public perception that metal-free restorations are more aesthetic

n Disadvantages of the metal ceramic systems include radiopacity, some questions centring around metal biocompatibility and lack of natural aesthetics

n Difference in reliability between metal-ceramic systems and all-ceramic systems

VENEERING OF METAL/CERAMIC SUBSTRUCTURES

Thank You for Your Attention!