Christensen Phenomenon — NDEB AFK MCQ
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Correct answer: E — A gap between posterior teeth as the mandible moves forward (separation of posterior teeth during protrusive excursion)
The Christensen phenomenon (Christensen gap) is the space (wedge-shaped gap) that develops between the posterior teeth when the mandible is protruded. It occurs because the condyles move downward along the articular eminence (condylar guidance), creating posterior disclusion. In complete dentures, this gap causes instability as the posterior denture base lifts away from the ridge. The protrusive (compensating) curve and condylar guidance angle are adjusted to maintain posterior tooth contact during protrusion (bilateral balanced occlusion).
Reference: Zarb – Prosthodontic Treatment for Edentulous Patients, 13th ed., 2013