Christensen Phenomenon — ORE Part 1 MCQ
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Correct answer: D — A posterior interocclusal space develops as the condyles move forwards and downwards
**A is correct.** The Christensen phenomenon is posterior disclusion, producing a posterior interocclusal space during protrusion. It occurs because forward/downward condylar movement is not matched by the anterior guidance; in complete-denture articulation this separation must be compensated for if balanced contacts in excursions are required. **B** describes return towards centric relation, not the protrusive phenomenon. **C** may occur with an unstable denture or inappropriate anterior contacts, but it is a clinical consequence rather than the definition. **D** is a phonetic/occlusal complaint, and **E** is a material-property issue. The key discriminator is posterior separation specifically during protrusive mandibular movement.
Reference: Csoma M. Significance of the Christensen phenomenon in complete denture construction. Quintessence International Dental Digest. 1973;4(5):33-38. https://pubmed.ncbi.nlm.nih.gov/4514104/