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Abstract

The etiologies of skeletal Class III malocclusion include excessive growth of mandible, deficient growth of maxilla, and the combination of both. Anterior openbite may be due to skeletal, dental, habitual, or functional problems. Mini-implant can be a reliable anchorage for maxillary molar intrusion, which facilitate anterior openbite closure by counterclockwise rotation of the mandible. However, the mandibular counterclockwise rotation may increase antero-posterior jaw discrepancy in Class III malocclusion. Therefore, surgical orthodontics is often required in the treatment of Class III malocclusion with anterior openbite. In this report, we present the treatment of an adult Class III patient with mandibular prognathism, excessive maxillary dentoalveolar growth, and anterior open bite. Due to financial consideration, the patient preferred to have onejaw surgery instead of two-jaw surgery. Two mini-screws were installed on bilateral infrazygomatic crest of the maxilla to correct anterior open bite by maxillary molar intrusion. Then mandibular surgery was done to setback the mandible. During the post-surgery orthodontic treatment period, the tongue-thrusting habit was progressively eliminated with the tongue training exercise. At the end of treatment, the facial esthetics was significantly improved and stable occlusal relationship was established.

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