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Prosthodontics & Occlusion · single question

Using complete dentures in place, the phrase 'San Francisco' (sibilant test) is used to evaluate fit. What finding should be observed?

  1. Approximately 1 mm of interocclusal (closest speaking) space between the posterior teeth during sibilant sounds
  2. Heavy posterior contact during the 'S' sound
  3. No tongue contact with the palate
  4. Complete separation of the lips
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Correct answer: A. Approximately 1 mm of interocclusal (closest speaking) space between the posterior teeth during sibilant sounds

The 'S' (sibilant) sounds bring the mandible to the closest speaking position; about 1 mm of clearance should remain posteriorly, indicating an appropriate vertical dimension.Other options: Posterior contact during sibilants suggests excessive vertical dimension; the other findings are not the assessed parameter.Key exam takeaway: Sibilant test: about 1 mm closest speaking space; contact during 'S' means VDO is too great.

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