title: Sequential analysis of head movement during mandibular open-close movements in TMD patients with disc displacement with reduction.
abstract: This study examined relationships between starting points of head and mandibular movements in 11 female control subjects and 10 TMD patients showing disc displacement with reduction during consecutive open-close movements, using a six-degree-of-freedom measuring device. During the first mandibular opening cycle, in the TMD group, head movement was significantly preceded in relation to mandibular movement when compared with the control group, and major differences in onset were seen between maximum and minimal values at the beginning of mandibular movements. After the second cycle, significant differences in starting points were not evident. In TMD patients showing disc displacement with reduction, in the first cycle, at the commencement of opening movements, it is proposed that the head precedes the mandible in order to compensate for irregular condylar movements, and the degree of the condylar movement irregularity might affect the onset relation between the head and the mandible.
authors.affiliation: Division of Comprehensive Prosthodontics, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, Japan. haruka@dent.niigata-u.ac.jp
authors.forename: Haruka
authors.initials: H
authors.lastname: Kon
authors.forename: Naoki
authors.initials: N
authors.lastname: Sakurai
authors.forename: Mikako
authors.initials: M
authors.lastname: Tanaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Naoko
authors.initials: N
authors.lastname: Sato
authors.forename: Saori
authors.initials: S
authors.lastname: Makita
authors.forename: Rumi
authors.initials: R
authors.lastname: Yoshida
authors.forename: Asako
authors.initials: A
authors.lastname: Kai
authors.forename: Shuichi
authors.initials: S
authors.lastname: Nomura
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007180:Incisor / Q000473:pathology; D007574:Jaw Relation Record / Q000379:methods; D004204:Joint Dislocations / Q000503:physiopathology*; D008334:Mandible / Q000473:pathology / Q000503:physiopathology*; D008335:Mandibular Condyle / Q000503:physiopathology; D008437:Maxilla / Q000473:pathology; D008875:Middle Aged; D009068:Movement; D016059:Range of Motion, Articular / Q000502:physiology*; D019224:Temporomandibular Joint Disc / Q000503:physiopathology*; D013705:Temporomandibular Joint Disorders / Q000503:physiopathology*; D013997:Time Factors; D014716:Vertical Dimension; D055815:Young Adult