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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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Notes on contributors
Haruka Kon
Dr. Haruka Kon received her D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. She is currently an assistant professor in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Naoki Sakurai
Dr. Naoki Sakurai received D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr. Sakurai is currently an assistant professor in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Mikako Tanaka
Dr. Mikako Tanaka received D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr. Tanaka is currently a lecturer in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Hiroshi Kobayashi
Dr. Hiroshi Kobayashi received D.D.S. and Ph.D. degrees from the Tokyo Medical and Dental University Faculty of Dentistry, Tokyo, Japan. Dr. Kobayashi is currently an associate professor in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Naoko Sato
Dr. Naoko Sato received D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr. Sato is currently an assistant professor in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Saori Makita
Dr. Saori Makita received a D.D.S. degree from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr. Makita is currently a postgraduate student in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Rumi Yoshida
Dr. Rumi Yoshida received D.D.S. and Ph.D. degrees from the Nippon Dental School of Life Dentistry Niigata, Niigata, Japan. Dr. Yoshida is currently a resident in the Department of Orthodontics, Niigata University Graduate School of Medical and Dental Sciences.
Asako Kai
Dr. Asako Kai received D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr Kai is currently a resident in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.
Shuichi Nomura
Dr. Shuichi Nomura received D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr. Nomura is currently a professor and chair in the Division of Comprehensive Prosthodontics in the Department of Tissue Regeneration and Reconstruction at Niigata University Graduate School of Medical and Dental Sciences.