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Prosthodontics & Occlusion · single question

For a completely edentulous patient, what is the significance of centric relation (CR)?

  1. It represents the most protruded jaw position
  2. It is the most reproducible and repeatable jaw position
  3. It is determined by the patient's comfortable resting position
  4. It coincides with maximum intercuspation in edentulous patients
Show answer and explanation

Correct answer: B. It is the most reproducible and repeatable jaw position

  • A. CR is not the most protruded position; that is maximum protrusion.
  • B. Correct. Centric relation (CR) is the most reproducible and repeatable position of the mandible because it is a bone-to-bone relationship (condyles in their most superior-anterior position in the glenoid fossae), independent of tooth contacts. This is why it is used as the reference position for complete denture fabrication.
  • C. CR is not determined by comfortable rest — that is the resting vertical dimension, a different concept.
  • D. In dentate patients, CR and MIP (maximum intercuspation) often don't coincide. In edentulous patients, there IS no maximum intercuspation — CR is used to establish the occlusal position.

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