Acute malocclusion outside the setting of macrotrauma is rare and therefore difficult to manage. Although some cases of acute malocclusion have been reported in the literature, to the authors' knowledge, there has been only one report of an acute anterior open bite. The authors review the current literature on acute malocclusion, with a focus on anterior open bite. A case of an acute-onset anterior open bite is reported, where a systematic workup with an emphasis on patient function is performed to narrow the differential diagnosis to one of an intra-articular etiology. Arthroscopic lysis and lavage with maxillomandibular fixation was performed to achieve restoration of the permorbid occlusion, which was maintained for at least 1 year.
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