title: Temporomandibular joint ankylosis contributing to coronoid process hyperplasia.
abstract: The purpose of this study was to investigate the association between coronoid process hyperplasia and temporomandibular joint (TMJ) ankylosis and to analyze the pathological mechanism and clinical significance of coronoid process hyperplasia. Forty-four patients treated for TMJ ankylosis between January 2007 and December 2014 were studied retrospectively; 176 patients with normal TMJs served as controls. The original DICOM data were used to reconstruct the jaw, and a three-dimensional cephalometric analysis (SimPlant Pro software version 11.04) was performed to assess the association between the severity of TMJ ankylosis and the height of the coronoid process. The height of the coronoid process was 20.41±5.00mm in the case group and 14.86±2.67mm in the control group; there was a significant difference between the two groups (P<0.001). Long-standing TMJ ankylosis contributes to coronoid process hyperplasia. Therefore, attention should be drawn to the coronoid process in patients with TMJ ankylosis. A coronoidectomy together with arthroplasty is recommended in patients with TMJ ankylosis.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Kunming Medical University, Kunming, China. Electronic address: wwh2002191@gmail.com.
authors.forename: W H
authors.initials: WH
authors.lastname: Wang
authors.affiliation: Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Kunming Medical University, Kunming, China.
authors.forename: B
authors.initials: B
authors.lastname: Xu
authors.affiliation: Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Kunming Medical University, Kunming, China.
authors.forename: B J
authors.initials: BJ
authors.lastname: Zhang
authors.affiliation: Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Kunming Medical University, Kunming, China.
authors.forename: H Q
authors.initials: HQ
authors.lastname: Lou
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000844:Ankylosis / Q000150:complications* / Q000000981:diagnostic imaging; D001178:Arthroplasty; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006965:Hyperplasia / Q000000981:diagnostic imaging / Q000209:etiology; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging / Q000473:pathology*
keywords: coronoid process hyperplasia; temporomandibular joint (TMJ) ankylosis; three-dimensional cephalometric analysis