Christensen Posterior Tooth Separation — NDEB AFK MCQ
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Correct answer: D — Posterior teeth (a gap develops between posterior teeth as the condyles move inferiorly along the articular eminence during protrusion)
During protrusion, the condyles translate anteriorly and inferiorly along the posterior slope of the articular eminence (condylar guidance). This posterior-inferior movement of the condyles causes the posterior jaw to drop away from the maxilla, creating a gap (Christensen gap) between the posterior teeth. In complete denture prosthodontics, this gap must be compensated by the arrangement of posterior teeth along a compensating curve to maintain bilateral balanced occlusion during protrusion.
Reference: Zarb – Prosthodontic Treatment for Edentulous Patients, 13th ed., 2013