Overcontouring of the lingual incline of a maxillary anterior crown would most likely affect which mandibular movement?

Correct answer: A. Protrusive movement

• A. Correct. The lingual inclines of maxillary anteriors guide protrusive movement (anterior guidance). Overcontouring creates premature protrusive contact, potentially leading to occlusal trauma and TMD.
• B. Lateral protrusive is less commonly tested; protrusive is the primary movement affected by maxillary anterior lingual surface contour.
• C. Right excursion similarly involves lateral guidance mechanics, not primarily anterior guidance.
• D. Left excursion involves working-side canine guidance (right-handed: left side) or group function; anterior crown overcontouring has less impact on lateral excursions.