Occlusal factors contributing to the development of habitual chewing side.
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概要
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The purpose of this study was to examine the relationship between the habitual chewing side, symptomatic side of temporomandibular disorders (TMD) and occlusal factors.<BR>One hundred patients, from whom informed consents were obtained, participated in this study. They were questioned about their habitual chewing sides and TMD symptomatic sides. Occlusal contact was examined with Dental Prescale 50H, type R; the patients were instructed to bite as hardly as possible for 3 seconds in the intercuspal position. The occlusal force and the occlusal contact area were analyzed with the Occluzer. The statistical test for the proportion and the chi-square test for independence were carried out.<BR>54 patients had their habitual chewing side in the right side and 46 in the left. The greater occlusal force was recorded in the habitual chewing side in 72 patients and in the opposite in 27 (p<0.01) . The larger occlusal contact area was recorded in the habitual chewing side in 65 patients and in the opposite in 30 (p<0.01) . With regard to TMD, among 36 unilateral symptomatic patients, the habitual chewing side coincided with the symptomatic side in 26 but not in 10 (p<0.05) .<BR>It is inferred that the occlusal factors such as occlusal force and occlusal contact area in the intercuspal position could contribute to the development of an habitual chewing side, and the TMD symptomatic side also might be close relationship with the habitual chewing side.
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