[Posterior bite collapse. 1. Etiology and diagnosis].

The posterior Bite Collapse is a sequelae of advanced break down. The presence of periodontal inflammation and loss of osseous support can induce teeth migration in a direction partially imposed by occlusal forces. Posterior Bite Collapse often causes mesial drifting of the posterior teeth and flaring of the anterior segments. It may be aggravated by early loss of teeth that are not replaced, by malocclusion or by a neuro muscular disorder.