For a veneer on a tooth with a WORN incisal edge, which margin design is used at the incisal?

Shoulder/Butt joint (A) for a veneer with incisal coverage (window prep or incisal wrap). When the incisal edge is worn, a shoulder preparation at the incisal provides:
• Sufficient thickness of ceramic at the incisal edge for strength
• A definitive, well-defined margin for accurate seating
• Better aesthetics (full control of incisal shape and length)

Veneer preparation designs:
• No incisal reduction (window prep): no incisal margin needed — only facial margin (chamfer or feather edge).
• Incisal coverage/overlap prep: requires a margin on the lingual → shoulder or chamfer at the incisal edge.
• Feather edge (C): used for cervical margin of veneers — least tooth reduction but less precise.
• For worn edges: shoulder gives the ceramist room to add incisal length and translucency.