A veneer preparation at the incisal edge of a maxillary central incisor should use which type of margin?

Correct answer: C. Shoulder

• A. A knife edge margin provides inadequate resistance and is contraindicated for incisal veneer margins.
• B. A chamfer margin is used for all-ceramic crowns and the gingival margin of veneers, not the incisal edge.
• C. Correct. A shoulder (butt joint) margin at the incisal edge provides a definitive seat for the porcelain veneer, creating a positive stop and preventing the thin porcelain from chipping at the incisal. This is the recommended incisal margin design for ceramic veneers.
• D. A feather edge margin provides insufficient bulk of ceramic at the incisal and does not create a definitive seat.