Upload
others
View
2
Download
0
Embed Size (px)
Citation preview
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!