NBDE Review Questions: Quiz 432 January 10, 2016 by Hassan Shah Leave a Comment When mandibular teeth are to be extracted, the patient should be positioned so that the occlusal plane of the mandibular arch is A. parallel to the floor when the mouth is wide open. B. perpendicular to the floor when the mouth is wide open. C. parallel to the floor when the teeth are closed together. D. perpendicular to the floor when the teeth are closed together. Δ
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