Effect of Osteoporosis on Bone Density of Orthognathic Osteotomy Sites in Maxillofacial Region.

Objectives: The aims of this study were to investigate the availability of Hounsfield unit (HU) measurement of computed tomography (CT) in evaluating the bone density of certain sites by comparing bone density between CT and dual-energy x-ray absorptiometry (DEXA), and to evaluate the effects of osteoporosis on osteotomy sites in orthognathic surgery. Methods: This retrospective study included 80 patients who had undergone both facial CT and DEXA at our hospital. We selected 7 regions of interest from among the osteotomy sites in bimaxillary orthognathic surgery. The patients were assigned to either the normal (control) group (n = 40) or the abnormal group (n = 40), and HU values were measured in each region of interest. Results: There were statistically significant differences in the mean HU values between 2 groups at all the osteotomy sites in the maxilla and mandible, with the normal group showing higher values than the abnormal group (P

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