Preferred gingival finish line for veneer metal restoration

 # The preferred gingival finish line for veneer metal restoration is:
a) Shoulder 
b) Chamfer
c) Shoulder with bevel 
d) Radial shoulder

The correct answer is B. Chamfer.

#Shoulder Finish Line
Indications: • All ceramic crowns • PFM crowns • Injectable porcelains 
Advantages:  • Good crown contours • Esthetics  • Less distortion • Provides adequate bulk
Disadvantages: • Least conservative • Inferior marginal adaptation

# Shoulder with bevel Finish Line
Indications: • Proximal boxes of onlays and inlays • Labial finish line of metal ceramics • Occlusal shoulder of onlays 
Advantages:  • Superior marginal adaptation • Resists distortion • Facilitates removal of unsupported enamel rods
Disadvantages: • Requires subgingival extension • Detection of post cementation caries is difficult

# Chamfer Finish Line
Indications: • Cast metal restorations • Lingual aspect of metal ceramics
Advantages:  • Conservative • Good marginal adaptation • Provides bulk
Disadvantages: • Improper fabrication may result in an unsupported tip

# Knife edge Finish Line
Indications: • Young patients • MOD onlay • Inaccessible areas • Finish lines in cementum
Advantages:  • Conservative • Ideal for marginal adaptation 
Disadvantages: • Does not provide a distinct finish line • Waxing, polishing and casting becomes critical • Overcontoured restoration in an attempt to obtain bulk

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