Prosthodontics & Occlusion · single question
When planning a fixed bridge to replace tooth #30 (mandibular right first molar), what is the PRIMARY challenge?
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Correct answer: B. Path of insertion due to abutment tooth inclination
After first molar loss, adjacent teeth (second premolar anteriorly, second molar posteriorly) tip mesially. This creates divergent long axes, making path of insertion the primary challenge for a rigid bridge. Source confirms: 'path of insertion (está en bootcamp)' + 'mesializados rotados.'
- A. Span length matters biomechanically, but with one missing tooth and tipped abutments, path of insertion is primary.
- B. CORRECT. Path of insertion = primary challenge. Mesially tipped/rotated abutments create divergent axes preventing bridge seating.
- C. Shade matching is relevant anteriorly — not the primary challenge for a mandibular molar bridge.
- D. Interarch space may be a factor if opposing teeth have super-erupted, but path of insertion is primary here.
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