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Assessment of premorbid occlusion is readily accomplished with careful history and, if available, dental or orthodontic records. Anterior open bites may be the result of bilateral fractures involving the condyles with posterior shortening of the rami. Anterior open bites that are premorbid may be identified by the presence of mammelons (rounded protuberances on the incisal edges) on the incisors, as seen in this orthognathic surgery patient.
