A posterior open bite is most commonly associated with which etiologic factor?

A posterior open bite occurs when posterior teeth fail to reach the occlusal plane, from a lateral tongue posture/thrust interposed between the teeth, mechanical interference, or ankylosis of a posterior tooth preventing its eruption.Other options: Deep bite and excessive posterior eruption reduce (not create) an open bite; Class II division 2 is characterized by deep bite.Key exam takeaway: Posterior open bite = teeth that never reached the occlusal plane (tongue posture, interference, or ankylosis).