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Abstract

To manage moderate mandibular prognathism combined with anterior open bite in adult cases,the dento-alveolar growth has to be guided and carefully utilized during orthodontic treatment, especially when the patients have acceptable profile before treatment and tend to deny the needs of orthognathic surgery. Two cases with similar diagnosis and treatment principle were reported. Extraction of mandibular molars provided spaces for lingual tipping movement of lower incisors, the lower occlusal plane showed a counter-clockwise rotation, the open-bite was accordingly corrected and the molar relationship was also normalized. To be able to command the occlusal plane changes is the key to archive the maintenance of the posterior facial height and the closure of the anterior open bite at the same time. Vertical control enhances the dento-facial esthetic results. Light orthodontic force is essential to limit unwanted extrusion of maxillary molars.

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