ABSTRACT
Objective@#To measure and analyze the bone volume and thickness of mandibular angle area by computer-assisted CT.@*Methods@#From January 2010 to January 2016, 94 female patients with mandibular angle hypertrophy and bilateral mandibular angle osteotomy were selected. Twenty female patients with non-mandibular surgery were selected as control group (patient examined after nasal augmentation surgery), aged 18 to 37 years, with an average of 27.5 years. Three dimensional CT data of maxillofacial bone of patients were collected. The three dimensional reconstruction and measurement software Mimics 16.0 was used. A three-dimensional model of mandibular angle region was established. The thickness and volume of mandibular angle were measured and analyzed. The total difference between hypertrophic group and normal group was compared by two independent t-test.@*Results@#The thickness of mandibular angle area and mandibular angle area in hypertrophic group were (9.39±1.48) mm and (3 065.25±720.1) mm3 respectively, and the thickness of mandibular angle area and mandibular angle region in control group were (7.48±0.92) mm and (1 276.57±265) mm3, respectively. There was a significant difference between the two groups (P < 0.05).@*Conclusions@#Based on CT scanning data, a method of measuring the bone volume and thickness of mandibular angle region is established, which is helpful to the three-dimensional measurement and analysis of mandibular shape in patients with mandibular angle hypertrophy.