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Journal of Dental Research
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*Joint Disorders
*Temporomandibular Joint Dysfunction
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Clinical

Occlusal Force and Condylar Motion in Patients with Anterior Open Bite

S. Miyawaki, Y. Araki, Y. Tanimoto, A. Katayama, A. Fujii, M. Imai and T. Takano-Yamamoto*

Department of Orthodontics and Dentofacial Orthopedics, Okayama University Graduate School of Medicine and Dentistry, 2-5-1, Shikata-cho, Okayama, 700-8525, Japan;

Correspondence: * corresponding author, t_yamamo{at}md.okayama-u.ac.jp

Patients with open bite often show a weak occlusal force and temporomandibular disorders (TMDs). If these are the main cause of open bite, it may be hypothesized that both pre-pubertal and adult open-bite patients would show a weak occlusal force and abnormal condylar motion. The purpose of this study was to test this hypothesis. Test group subjects consisted of 13 consecutive pre-pubertal and 13 adult patients with anterior open bite. They were compared with age-matched normal subjects. The adult open-bite group showed a weaker occlusal force and a shorter range of condylar motion compared with the control subjects. In the pre-pubertal subjects, however, there were no significant differences in the occlusal force and range of condylar motion between the open-bite and control groups. Therefore, these results suggest that a weak occlusal force or TMDs may not be the main cause of open bite.

Key Words: anterior open bite • condylar motion • occlusal force • orthodontic patients • temporomandibular joint (TMJ)

Journal of Dental Research, Vol. 84, No. 2, 133-137 (2005)
DOI: 10.1177/154405910508400205
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