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Abstract
The present study was conducted to investigate whether there was a functional coupling between the head and mandibular movements in ten patients with mandibular protrusion (MP) and ten control subjects with normal occlusion (Normal), using a six degrees-of-freedom measuring device. Single-peak waveforms were predominantly seen in both MP (98.2%) and Normal (99.3%). However, vertical displacements of the upper and lower incisor points (VDUIP and VDLIP) were all significantly larger in MP than those in Normal. The ratio VDUIP/VDLIP also increased more sharply with an increase in VDLIP in MP, compared to that in Normal. Mandibular rotation in MP was also significantly larger than that in Normal. The results showed that, in MP, the head moves more vertically in rhythmical coordination with mandibular movement during tapping. Finally, it may be that this larger vertical head movement is related to the greater condylar rotation in MP subjects.
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Notes on contributors
Hiroshi Nibe
Dr Hiroshi Nibe received D.D.S. and Ph.D. degrees from the Niigata University Faculty of Dentistry, Niigata, Japan. Dr. Nibe is currently a resident in the Division of Orthodontics, Department of Oral Biological Science, Section for Oral Life Science, Graduate School of Medical and Dental Sciences, Niigata University. Dr. Nibe has done TMD treatment in many orthodontic cases.
Kazuhiro Yamada
Dr. Kazuhiro Yamada received his D.D.S. and Ph.D. degrees from the Niigata University, Faculty of Dentistry, Niigata, Japan. Dr. Yamada is currently a lecturer in the Division of Orthodontics, Department of Oral Biological Science, Section for Oral Life Science, Graduate School of Medical and Dental Sciences, Niigata University.
Tadao Fukui
Dr. Tadao Fukui received her D.D.S. and Ph.D. degrees from the Niigata University, Niigata, Japan. Dr. Fukui is currently an assistant professor in the Division of Orthodontics, Department of Oral Biological Science, Section for Oral Life Science, Graduate School of Medical and Dental Sciences, Niigata University.
Shoji Kohno
Dr. Shoji Kohno received his D.D.S. and Ph.D. degrees from the Tokyo Medical and Dental University, Faculty of Dentistry, Tokyo, Japan. Dr. Kohno is currently a professor and chair in the Division of Removable Prosthodontics, Department of Tissue Regeneration and Reconstruction, Section for Oral Life Science, Graduate School of Medical and Dental Sciences, Niigata University.
Kooji Hanada
Dr. Kooji Hanada received his D.D.S. and Ph.D. degrees from the Tokyo Medical and Dental University, Faculty of Dentistry, Tokyo, Japan. Dr. Hanada is currently a professor in Dental Hygiene and Speech, Meirin College for Dental Technology, Niigata, Japan.