Denture Vertical Dimension — ORE Part 1 MCQ
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Correct answer: C — Excessive occlusal vertical dimension (OVD)
Explanation lettering: C = shown as A · A = shown as C
The correct answer is A: Excessive OVD. When OVD is excessive, the freeway space (interocclusal clearance) becomes inadequate. During speech, the mandible moves dynamically, but reduced freeway space forces rapid jaw closure and sudden contact between denture bases, producing a clicking or clacking sound. This represents 'tension in functional speech' as documented in the prosthodontic literature. Insufficient OVD (B) causes loose, ill-fitting dentures and aesthetic complaints but not speech-specific clicking. Poor retention (C) and overextended flanges (E) cause slipping or tissue irritation rather than clicking. Incorrect centric relation (D) affects occlusal comfort and bite stability but not speech-related impacts.
Reference: Increased vertical dimension of occlusion: signs, symptoms, diagnosis, treatment and options. PubMed PMID 23579908 (2013), and Effect of denture fabrication and wear on closest speaking space and interocclusal distance during deglutition. PubMed PMID 17618921 (2007), https://pubmed.ncbi.nlm.nih.gov/23579908/