Mandibular Prognathism Case Report: Surgery Followed By Orthodontic Treatment

Mandibular prognathism is one of the clinical features of skeletal Class III malocclusion. Such malocclusions are often accompanied by facial concavity and a mesial occlusal relationship of the dentition, which can severely affect the patient's physical and mental health development. This article reports on a complex case of mandibular protrusion with a 4mm left deviation. Detailed preoperative analysis revealed that the patient was 18 years old, with mild crowding of the upper and lower dental arches and a generally matched width of the upper and lower dental arches. Surgical correction of the jaw disharmony was performed first to shorten the overall treatment time for the patient. Early improvement in facial profile can also enhance patient cooperation and satisfaction. The surgery induced localized accelerated osteogenesis, which can speed up the alignment of teeth during postoperative orthodontic treatment. After 32 months of treatment, the surgery first addressed the jaw disharmony, followed by precise postoperative orthodontic adjustments to the occlusal relationship. Post-treatment, the patient's anterior teeth had normal overbite and overjet, the posterior teeth had good cusp-fossa relationships, and the facial profile changed from concave to straight, achieving good clinical and aesthetic outcomes.