A study on the bite force and the electromyographic activity of masticatory muscle in deepbite

Jeong, Dong Ki; Kim, Kwang Won

Abstract

This study was undertaken to investigate the correlations bite force and the electromyographic activities of masticatory muscle in deepbite, using the Tr Scan system and electromyograph. The subjects of this study consisted of two groups; one of 20 individuals with normal occlusion, the other group of 30 with deepbite. The deepbite was composed of Class I deepbite(male 9, female 7) and Clas II div. 1 deepbite(rnale 8, female 6). The obtained results of this study were as follows: 1. The maximum bite force was 155.93 N in normal occlusion, 165.11 N in Class I deepbite group, 111.55 N in Class II div. 1 deepbite group. 2. The greater the number of tooth contacts, the more the bite force increased in all groups. 3. During maximum clenching, masseter and ant. temporalis muscle activity of normal and Class I deepbite group were significantly higher than that of Class II div. 1 deepbite group, and the activity of masseter muscle was higher than that of ant. temporalis muscle in all groups. 4. The greater the maximum bite force, tile more the muscle activities increased in all groups.