Prosthodontics & Occlusion · single question
Articulating paper marks a contact on the LINGUAL CUSP of tooth #4 (maxillary right first premolar). Which mandibular movement created this contact?
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Correct answer: D. Right lateral excursion
Tooth #4 is the maxillary RIGHT first premolar. In RIGHT lateral excursion, the right (working) side teeth occlude — the lingual cusp of #4 contacts on the right working side movement. In left lateral excursion, #4 is on the balancing/non-working side.
- A. Left lateral excursion = LEFT working side. #4 (right side) = balancing side — would be a balancing interference, not expected working contact.
- B. Retrusion produces contacts at RCP — posterior medial contacts, not specifically lingual cusp of premolar.
- C. Protrusion contacts occur anteriorly; posterior teeth should be in protrusive disclusion.
- D. CORRECT. Right lateral excursion = RIGHT working side. Lingual cusp of #4 contacts during right working movement.
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