What term describes posterior disclusion during certain movements, often achieved by canine guidance?

• A. Disclusion of posterior teeth during excursions.
• B. Simultaneous posterior contact during all movements.
• C. Posterior teeth locking in place.
• D. Anterior teeth contacting only during function.

Answer: (A)

The concept tested is posterior disclusion during jaw movements, typically produced by canine guidance. When the mandible moves laterally or protrusively, the canines guide the bite so the posterior teeth separate instead of contacting. This disclusion protects the posterior teeth and joints and helps channel forces to the anterior teeth during excursion.

That’s why this term fits best: it specifically describes the posterior teeth becoming disengaged during excursions. The other ideas imply ongoing posterior contact during movement, posterior teeth staying locked, or the anterior teeth alone guiding function in a way that doesn’t capture the disclusion of the posterior teeth.