title: Moving the mandible to the retruded contact position for simulating the hinge movement in virtual three-dimensional orthognathic surgery by integrating the plaster models.
abstract: The range of rotation of the mandible during virtual three-dimensional orthognathic surgery is small and may be similar to the hinge movement of the mandible. This current study offers a new method to move the mandible to the retruded contact position (RCP), a position of beginning hinge movement, during virtual three-dimensional orthognathic surgery. During this method, a three-dimensional skull model was reconstructed from the computed tomographic images in the Mimics software. Then the RCP in the patient could be obtained using Gothic arch tracer or swallowing method and was recorded using a wax plate, followed by transferring to plaster models. Subsequently, the plaster models in RCP were scanned using a dental surface scanner and imported into the Mimics software. Finally, we could move the mandible to the RCP based on the registration between the three-dimensional skull model and plaster model for simulating the hinge movement during virtual three-dimensional orthognathic surgery. This may be a small step forward for improving the accuracy of virtual three-dimensional orthognathic surgery.
authors.affiliation: From the *Department of Oral & Cranio-Maxillofacial Science, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai Key Laboratory of Stomatology; and †National Die & Mould CAD Engineering Research Center, Shanghai JiaoTong University, Shanghai, China.
authors.forename: Jiewen
authors.initials: J
authors.lastname: Dai
authors.forename: Jiangfei
authors.initials: J
authors.lastname: Zhang
authors.forename: Guanghong
authors.initials: G
authors.lastname: Hu
authors.forename: Pengfei
authors.initials: P
authors.lastname: Xin
authors.forename: Shunyao
authors.initials: S
authors.lastname: Shen
authors.forename: Steve Guofang
authors.initials: SG
authors.lastname: Shen
mesh_terms: D003760:Dental Impression Materials; D003761:Dental Impression Technique; D003766:Dental Occlusion; D006801:Humans; D021621:Imaging, Three-Dimensional; D007574:Jaw Relation Record; D008334:Mandible / Q000000981:diagnostic imaging / Q000502:physiology* / Q000601:surgery*; D008953:Models, Anatomic; D057909:Orthognathic Surgery / Q000379:methods*; D012399:Rotation; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed
chemical_list: D003760:Dental Impression Materials