Prosthodontics & Occlusion · single question
Overcontouring of which surface leads to premature contact at the incisal edge during protrusive movements?
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Correct answer: C. Lingual incline of maxillary anterior teeth
The lingual incline of maxillary anteriors guides protrusive movements. Overcontouring this surface creates premature incisal contact during protrusion, disrupting anterior guidance.
- A. Mesial marginal ridges affect interproximal contacts, not incisal guidance during protrusion.
- B. The distal surface affects contacts in lateral excursions more than incisal guidance.
- C. CORRECT. The lingual incline of maxillary anteriors is the guiding surface for protrusion. Overcontouring creates a premature incisal edge contact, interfering with anterior guidance.
- D. The buccal surface affects esthetic contour but not the incisal guidance mechanism.
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