[APPLICATION OF THREE-DIMENSIONAL CEPHALOMETRIC ANALYSIS IN ORTHOGNATHIC SURGERY].

OBJECTIVE: To establish a model of three-dimensional (3-D) cephalometric analysis to study dentomaxillofacial deformities. METHODS: Between January 2012 and October 2013, 15 patients with dentomaxillofacial deformities were treated using 3-D cephalometric analysis in orthognathic surgery plan. There were 7 males and 8 females with an average age of 23.6 years (range, 17-37 years), including 4 cases of mandibular protrusion with maxillary deficiency, 4 cases of maxillary protrusion with mandibular deficiency, 2 cases of long face syndrome, and 5 cases of facial asymmetry. CT images were reconstructed by Mimics software. The anatomical landmarks were located, the reference planes and analysis planes were defined and the 3-D coordinate was established. The distance and degree between landmarks and analysis planes which defined in the measure project were measured. RESULTS: Based on the 3-D CT quantitative analysis methods, cephalometric analysis project was defined in the 3-D coordinate. 3-D cephalometric analysis provided a convenient and precise method for the clinical measurement of dentomaxillofacial morphology, and reduce the time in preoperation analysis. CONCLUSION: The model of 3-D CT cephalometric analysis can provide precise information in the diagnosis and treatment planning of orthognathic surgery.