A Case of the Jaw Deformity with Facial Asymmetry and Fibrous Dysplasia

Abstract

A 13-year-old female with facial asymmetry and fibrous dysplasia on the right side of the mandible complained of cross bite and facial asymmetry due to a shift of the mandible to the left. The problems were: 1. Cross bite of the left side and scissors bite of the right side; 2. A 9.0 degree tilt of the occlusal plane; 3. Spaced dental arch of the right molar region of the mandible; 4. Facial asymmetry; and 5. Fibrous dysplasia of the mandible.
Orthodontic treatment followed by surgical procedures was performed. Before the orthognathic surgery, the upper arch was aligned in two segments; one segment, including canine, premolars, and molars of the right side, was prepared for alveolar segmental osteotomy. After alignment of the upper and lower dental arches, the posterior maxillary alveolar segmental osteotomy on the upper right segment and SSRO were performed. The upper right segment was moved to the planned position to enable expansion and elongation, and the mandible was also moved to enable a mandibular shift. Post-operatively, detailing and finishing were performed in the orthodontic treatment, after which the fibrous dysplasia of the mandible was reduced by operation, and the final result was an improved occlusion.