Prosthodontics & Occlusion · single question
A patient has crowns on teeth #8 and #9. Over-contouring of which surface will most compromise the restoration's success?
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Correct answer: C. Lingual incline
- A. Over-contouring mesially affects proximal contacts and tissue health but is less critical than lingual.
- B. Over-contouring distally affects proximal contacts similarly.
- C. Over-contouring of the LINGUAL INCLINE of maxillary anterior crowns (#8 and #9) creates premature contact in PROTRUSION and/or CENTRIC, interfering with anterior guidance and potentially causing occlusal trauma, crown failure, or TMD symptoms. The lingual surface of upper anterior crowns is critical for anterior guidance (protrusive movement) — over-contoured lingual surfaces create deflective contacts that disturb the occlusal scheme.
- D. Over-contouring of the incisal edge changes the vertical dimension and length but does not typically cause the most clinically significant occlusal or periodontal failure.
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