Prosthodontics & Occlusion · single question
For the same patient with over-contoured crowns on #8 and #9 — which mandibular movement would most likely be affected?
Show answer and explanation
Correct answer: C. Protrusive movement
- A. Opening movement is a hinge movement primarily — not directly affected by crown contour on anterior teeth.
- B. Right lateral excursion is guided by the right canine (#6) — not primarily by #8 and #9.
- C. PROTRUSIVE movement is guided by the maxillary anterior teeth, primarily the central incisors (#8 and #9) through the principle of anterior guidance. Over-contoured lingual surfaces of #8 and #9 create premature contact during PROTRUSION, making this the movement most directly affected.
- D. Left lateral excursion is guided by the left canine (#11) and posterior teeth — not primarily by #8 and #9.
Practice Prosthodontics & Occlusion questions Prosthodontics & Occlusion study notes