title: Three-dimensional preoperative design of distraction osteogenesis for hemifacial microsomia.
abstract: The purpose of this research was to simulate mandibular movement calculated from three-dimensional computed tomography (CT) data to determine the linear distractor position to correct mandibular deformities in a series of patients with hemifacial microsomia (HFM). Preoperative CT scans from 6 HFM patients were obtained and imported into a CT-based software program (Mimics) to produce three-dimensional images and data. After measurement of the mandibular deficiency in 3 dimensions (horizontal and vertical), the angle between the distraction device and the ramus was determined by a geometric calculation, and then the surgery was performed on the three-dimensional model constructed using the rapid prototyping technique. This planning method was finally used in the treatment of 6 HFM patients. The HFM was corrected, and a symmetrical facial contour obtained without any complications in these 6 patients. The results matched the expectation before surgery that the distractor elongation would range from 18 to 22 mm. The distraction tracing model fitted the actual postdistraction tracing to within 2 mm. The preoperative design and three-dimensional modeling technique are considered to be helpful in enhancing the predictability and improving the outcome of the treatment of distraction osteogenesis.
authors.affiliation: From the Department of Craniomaxillofacial Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Science, Peking Union Medical College, Beijing, People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Niu
authors.forename: Bing
authors.initials: B
authors.lastname: Yu
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Liu
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.forename: Lai
authors.initials: L
authors.lastname: Gui
mesh_terms: D000293:Adolescent; D002508:Cephalometry; D002648:Child; D003198:Computer Simulation; D017076:Computer-Aided Design; D005260:Female; D006053:Goldenhar Syndrome / Q000000981:diagnostic imaging* / Q000601:surgery*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D019857:Osteogenesis, Distraction / Q000379:methods; D012985:Software Design; D014057:Tomography, X-Ray Computed / Q000379:methods*; D016896:Treatment Outcome