Effect of Vertical Cuspal Interferences on Occlusal Force.

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  • Kihara Nobuaki
    Osaka Dental University, Graduate School, Major in Prosthodontics

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  • 垂直的こう頭干渉がこう合力発現に及ぼす影響

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Abstract

This study was conducted to investigate the influence of the vertical cuspal interference with the madibular first molar on the appearance of occlusal force during maximum clenching and mandibule tapping.<BR>Occlusal force was measured using a three-dimensional transducer placed on unilateral first molars of mandible. Cuspal interference was applied using stainless foils (10, 30, 50, 70, 100, 200, 500, 1, 000 and 2, 000 m in thickness) to the flat occlusal table. The results were as follows:<BR>1. At the height of cuspal interferences of 10-100μm, the impulse of occlusal force increased by the centralization of force with the increase in height during clenching (10μm: 1.2 times compared to control, 100 m: 5.9 times).<BR>2. At the height of 10-100μm, the impulse of occlusal force increased by the centralization of force with the increase in height, although EMG activity (AOTC, DOTC, APTC·MV) was not changed (10μm: 1.7 times, 100μm: 5.3 times).<BR>3. At the height of 100-200μm, the mandibule became unstable, with marked changes in the impulse of occlusal force, EMG activity and mandibular position. In two of the three subjects, the increase of the occlusal force was inhibited and in the other increased.<BR>4. These findings indicate that cuspal interference is a very serious acute problem for concerned teeth.

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