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all ceramic crowns and extended veneers in anterior dentition (case report)

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by

alaa tarek

on 4 December 2012

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Transcript of all ceramic crowns and extended veneers in anterior dentition (case report)

All ceramic veneers and extended veneers in anterior dention
(case report) Supervised by :

Prof. dr. Ahmed naguib





Presented by :

Mohammed ayman ellaethy

Alaa tarek Abu-elkomsan Ceramic it’s the most natural looking synthetic replament of missing teeth ( low tensile , low britlness )

When fused to metal ……. Full coverage



When its placed subgingival … increase darkening (umbrella effect )



So ceramic veneers are produced :

High success rate 98.9% anteriorly after 11 year



Causes of failure of veneers:

1- catastrophic fracture

2- chipping

3- recurrent caries

Advantages:

1- less invasise to tooth structure



causes of fauilure of of ceramc veneers

1- frature

2- microleakage

3- debonding



(shouldn’t be the first choice of restoring an anterior dentition ) case report

29 years old patient… after complete diagnosis it showsthe following

• class III, class IV secondary caries

• discoloration after root canal treatment

• slight malalignment

• no probing

• normal class I occlusion

• upper left central and lateral incisors are endo treated … with compromised crowns

• fiber posts

• veneers over vital teeth

• partial overage on premolars





problem facing :

1- interproximal cosmotic mismatch due to the differing thickness of adjacent restorations

2- secondary caries on premolars

3- enamel cracks



(leucite glass ceramic was the treatment of choice because it allows for adhesive cementation ) finish line preparation Crown preparation extended veneer preparation : (supragingival margins )

1- same previous steps except in

• depth reduction 0.5 mm

• the interproximal F.L should be located at lingo-proximal line angle

• if preexisting restoration were placed …. F.L should be placed deeper into palatal surfaces Provisionalization: Impression taking : prepared facial wall
interproximal reduction palatal reduction Definitive restoration : procedures.

After removal of the provisional restorations,the preparations were cleaned withpumice and dried.

The transparent try-in paste was placed, and any excess was removed with a spatula

1- removal of additional silicone

2- etching of ceramic by hydrofluoric acid for 60 seconds

3- Etching by 37% phosphoric acid

4-rinsing of phosphoric acid

And applying silane coupling agent with a micro brush in inner surface of restoration Patient-related factors There may be an increased load due to the lack of

1- posterior dentition,

2-reduced salivary flow resulting from the use of medication

3-periodontal problems that can weaken the stability of the tooth. Remaining tooth tissue Ceramic system 1- the type of restoration (crown or veneer),
2- type of cementation (adhesive or
traditional),
3- esthetic and functional However, the choice of ceramic
system is highly dependent on Thank you .... :) facial wall preparation remove excess cement incisal reduction acid etching of tooth applying resin cement finishing preparation after preparation removal of retraction cord scraping polymerized cement applying retraction cord hybridization of tooth structure finger gentle pressure light curing final result
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