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Anatomy & Histology · single question

What is the main physiologic purpose of anterior (incisal/canine) guidance in occlusion?

  1. To increase the total occlusal contact area during chewing
  2. To disengage the posterior teeth during excursive movements, reducing the lateral/protrusive force load placed on them by the elevator muscles
  3. To increase vertical dimension of occlusion
  4. To eliminate the need for a centric stop
Show answer and explanation

Correct answer: B. To disengage the posterior teeth during excursive movements, reducing the lateral/protrusive force load placed on them by the elevator muscles

Anterior guidance causes posterior tooth disocclusion during lateral and protrusive excursions (mutually protected occlusion), which reduces the destructive lateral forces — generated by the elevator muscles (masseter, temporalis, medial pterygoid) — that would otherwise load the posterior teeth and periodontium.

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