Which tooth surface's overcontouring on an anterior crown would most likely lead to occlusal interference during protrusive movement?

Correct answer: C. Lingual incline

• A. Distal edge overcontouring affects proximal contacts; it does not primarily interfere with protrusive guidance.
• B. Incisal edge overcontouring affects the height of the crown but is less likely to create a protrusive interference compared to the lingual incline.
• C. Correct. The lingual incline (palatal surface) of maxillary anterior crowns is critical for anterior guidance during protrusive movement. Overcontouring the lingual incline creates premature contact during protrusion, which can lead to occlusal trauma, muscle pain, and TMD.
• D. Mesial edge overcontouring affects proximal contacts and embrasures, not primarily protrusive guidance.