Individualized maxillary asymmetry rotation in correction of occlusal plane cant deformity

Abstract

Objective To evaluate the application of maxillary asymmetry rotation in the correction of occlusal plane cant and facial asymmetry deformity, to summarize the treating experience of patients with facial asymmetrical deformity and to provide a reference for clinical treatment. Methods An analysis of 32 patients with maxillary occlusal plane cant and facial asymmetry deformity with spiral CT before operation and radiography of the skull before and after operation. The CT data was used to simulate operation, and to design individualized scheme and asymmetric rotation of the maxillary plane with the assistance of computer. The preoperative and postoperative data were statistically analyzed with the paired t test. Results All the patients obtained satisfactory results both in face morphology and function. Facial deformities were corrected successfully without serious complications. The postoperative height difference of the left side and the right side (0.6 ± 0.5) mm was less than that preoperative height difference (4.7 ± 1.5) mm, which was statistically different (t= 15.172, P<0.001) . The postoperative angle of maxillary plane (0.5 ± 0.5) ° was less than the preoperative data (4.4 ± 1.7) °, which was statistically different (t= 12.934, P<0.001) . The postoperative asymmetric rate of jaw bone (0.7 ± 0.6) % was less than preoperative data (5.5 ± 1.7) % which was statistically different (t= 15.640, P<0.001) . Conclusions (1) Digital computer assisted surgical techniques can help simulate surgical procedures, design individual surgical scheme, rebuild postoperative soft and hard tissues and guide the accurate osteotomy of orthognathic surgery. (2) The asymmetric rotation of the maxillary plane can correct the deformity of the maxillary plane canting, achieve the symmetrical coordination of the facial soft and hard tissue and rectify the asymmetric deformity of the face. Key words: Dental occlusion, balanced; Stomatognathic system abnormalities; Osteotomy, Le Fort; Orthognathic surgery; Surgery, computer-assisted