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  • Title: Sequential analysis of head movement during mandibular open-close movements in TMD patients with disc displacement with reduction.
    Author: Kon H, Sakurai N, Tanaka M, Kobayashi H, Sato N, Makita S, Yoshida R, Kai A, Nomura S.
    Journal: Cranio; 2012 Oct; 30(4):272-9. PubMed ID: 23156968.
    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.
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