title: Influence of temporomandibular joint disc displacement on mandibular advancement in patients without pre-treatment condylar resorption.
abstract: The purpose of this study was to clarify the correlation between pre-treatment anterior disc displacement and mandibular stability after orthognathic and orthodontic treatment among patients with a skeletal class II malocclusion and without pre-treatment condylar resorption. Thirty-seven patients were included (7 male, 30 female). The mean length of follow-up was 6.76±3.06 years. Patients with condylar resorption before treatment were excluded. Magnetic resonance images and lateral cephalometric radiographs were taken before treatment (T0), after treatment (T1), and at follow-up (T2). Patients were classified according to the degree of disc displacement: -10-10° 'normal', 11-50° 'slight to mild', ≥51° 'moderate to severe'. Results showed the condyle moved posterosuperiorly after treatment, and then moved anteriorly to a more concentric location during the long follow-up period. Condylar movement was found not to correlate with disc displacement. The degree of disc displacement before treatment did not correlate with the post-surgical mandibular positional change in either the sagittal or vertical direction. To conclude, the mandibular bilateral sagittal split ramus osteotomy was stable in the long-term after orthognathic and orthodontic treatment. In the absence of pre-treatment condylar resorption, the degree of initial anterior disc displacement did not have a significant influence on the stability of mandibular advancement.
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Curriculum in Oral Biology, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Miao
authors.affiliation: Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: X-D
authors.initials: XD
authors.lastname: Wang
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: L-X
authors.initials: LX
authors.lastname: Mao
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: Y-H
authors.initials: YH
authors.lastname: Xia
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: L-J
authors.initials: LJ
authors.lastname: Yuan
authors.affiliation: Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: M
authors.initials: M
authors.lastname: Cai
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: J-Q
authors.initials: JQ
authors.lastname: Liu
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: B
authors.initials: B
authors.lastname: Wang
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: X
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Radiology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: L
authors.initials: L
authors.lastname: Zhu
authors.affiliation: Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: H-B
authors.initials: HB
authors.lastname: Yu
authors.affiliation: Division of Craniofacial Orthodontics, Department of Oral and Craniomaxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. Electronic address: fangbing@sjtu.edu.cn.
authors.forename: B
authors.initials: B
authors.lastname: Fang
mesh_terms: D000328:Adult; D001862:Bone Resorption / Q000473:pathology; D002508:Cephalometry; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008313:Malocclusion, Angle Class III / Q000473:pathology* / Q000601:surgery*; D019186:Mandibular Advancement; D008335:Mandibular Condyle / Q000473:pathology; D019224:Temporomandibular Joint Disc / Q000473:pathology* / Q000601:surgery*; D013705:Temporomandibular Joint Disorders / Q000473:pathology* / Q000601:surgery*; D016896:Treatment Outcome
keywords: Le Fort I and BSSRO; disc displacement; mandibular stability; skeletal class II malocclusion