The Study of the Relationship between Habitual Chewing Side and Tooth Guide

• Published in: Nihon Hotetsu Shika Gakkai Zasshi Vol. 37; no. 5; pp. 961 - 973
• Main Authors: Ieiri, Yoshika, Matsuo, Kouichi, Okimoto, Kimie, Terada, Yoshihiro
• Format: Journal Article
• Language: English; Japanese
• Published: Japan Prosthodontic Society 1993
• Subjects: habitual chewing side; principal component analysis; tooth guide
• ISSN: 0389-5386; 1883-177X
• DOI: 10.2186/jjps.37.961

We examined the relation between the tooth guide in lateral excursion and habitual chewing side. Out of the 90 subjects studied, 45 had a chewing side preference (habitual chewing group), 19 preferring the right side and 26 preferring the left side. 32 subjects were randomly selected as the control from the subjects without chewing side preference. The data of working side guidance and balancing contacts in those groups were evaluated by principal component analysis. The following results are obtained: 1. In the control group, the working side guidance by cuspid and premolars was predominantly observed compared with that in the habitual chewing group. 2. The M-type guide of the cuspid was observed on both sides in the control group, while that in habitual chewing group was more predominant on the habitual side than on the opposite side. 3. The balancing contacts were considered to be influenced when the working side guidance was not confirmed clearly. The habitual chewing side may be the side with less balancing contact on the working side in mastication. 4. The features of tooth guide in lateral excursion had some similarities between the subjects with right/left TMJ symptoms and right/left chewing group. The above suggests TMJ symptoms may appear on the habitual chewing side.