J Korean Acad Prosthodont.  1998 Aug;36(4):598-614.

EFECTS OF LATERAL GUIDANCE AND CHEWING PATTERN ON MASTICATORY MUSCLE ACTIVITY AND OCCLUSAL CONTACT

Affiliations
  • 1Department of Prosthodontics, School of Dentistry, Wonkwang University, Korea.

Abstract

This study was performed to investigate the influence of lateral guidance pattern and chewing pattern on masticatory muscle activity and occlusal contact pattern. Twenty-five patients with temporomandibular disorders and thirty students without temporomandibular disorders were selected for this study. Electromyographic examination and occlusal contact examination were performed simultaneously with Bio-Pak System(Bioresearch Inc.,U.S.A.) and T-Scan System(Tekscan Co., USA). The obtained results were as follows : 1. The EMG activity of masseter and anterior temporal muscle in patient group with canine guidance was higher than with non-canine guidance, but there was no significant difference(p>0.05). 2. The EMG activity of anterior temporal muscle in normal group with non-canine guidance was higher at preferred chewing side than at opposite side(p<0.05). 3. The EMG activity of masseter muscle was higher in normal group than in patient group (p<0.05). 4. The number of occlusal contact in patient group with canine guidance was higher than with non-canine guidance, but there was no significant difference(p>0.05). 5. The occlusal contact force at preferred chewing side was higher in patient group than in normal group(p<0.05).


MeSH Terms

Dental Occlusion
Humans
Masseter Muscle
Mastication*
Masticatory Muscles*
Temporal Muscle
Temporomandibular Joint Disorders
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