Prosthodontics & Occlusion · single question
A patient moves from maximum intercuspation (MIP) to a lateral excursion. What occurs at the condyles?
Show answer and explanation
Correct answer: C. One condyle rotates (working side) and the other translates (non-working/balancing side)
✓ C) One condyle rotates, the other translates is correct.
During lateral excursion: the working-side (ipsilateral) condyle rotates in place (pivot point), while the non-working/balancing-side (contralateral) condyle translates anteriorly and medially (Bennett movement). This is the fundamental biomechanics of lateral mandibular movement. The image in the PDF appears to show protrusion/lateral movement — in pure protrusion, BOTH condyles translate anteriorly.
During lateral excursion: the working-side (ipsilateral) condyle rotates in place (pivot point), while the non-working/balancing-side (contralateral) condyle translates anteriorly and medially (Bennett movement). This is the fundamental biomechanics of lateral mandibular movement. The image in the PDF appears to show protrusion/lateral movement — in pure protrusion, BOTH condyles translate anteriorly.
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