Prosthodontics & Occlusion · single question
The incisal margin for a porcelain veneer on a central incisor is being prepared. Which finish line is MOST appropriate?
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Correct answer: B. Chamfer
A chamfer finish line is the preferred incisal margin for porcelain veneers. It provides a gentle concave transition that gives adequate porcelain bulk at the margin for strength without being overly destructive of tooth structure. A shoulder provides too much removal; a knife edge provides insufficient support and risks fracture; a butt joint (window preparation) is an alternative technique where the incisal edge is preserved entirely.
- A. ❌ A knife edge provides too little support and leads to veneer fracture at the incisal margin.
- B. ✅ CORRECT – Chamfer is the preferred incisal finish line for veneers, balancing porcelain bulk and tooth preservation.
- C. ❌ A shoulder requires excessive tooth reduction and is used for full-coverage crowns.
- D. ❌ A butt joint (window preparation) is an alternative approach — but when an incisal reduction IS performed, chamfer is standard.
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