咬合力負担領域の変化が睡眠時咬筋活動に及ぼす影響

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The present study was carried out to evaluate the effects of the change in occlusal area and region on nocturnal masseter muscle activity. The subjects were 8 adult males with normal masticatory function. The maximum occlusal force and occlusal contact area of each subject were tested by using Dental Prescale. The subjects were classified into two groups from the following two different criteria : the maximum occlusal force and the proportion of right-hand and left-hand occlusal forces. On the basis of the data obtained from the above-mentioned occlusal forces, three biteplates were designed. Partial contact biteplate having a contact area on a tooth of lateral side, bilateral contact biteplate having two contact areas on the respective teeth of bilateral side, and full contact biteplate contacting with whole teeth. Using a long-term EMG recording nocturnal EMG was recorded with application of a biteplate. The EMG at maximum clenching was also recorded in the beginning of the recording and 7 reference levels, namely 75, 50, 40, 30, 20, 10 and 5% of the maximum clenching, were determined to evaluate the nocturnal EMG. The duration and frequency of muscle activities in 7 reference levels were analyzed. The following results were obtained. 1. Significant relationship was found between maximum occlusal force and occlusal contact area. But no significant relationship was found between these numerical values and the electric potentials at maximum clenching. 2. No significant differences were found among the three types of biteplates through whole subjects. 3. In the masseter muscle activity of the group indicating strong occlusal force, significant decrease was found in application of all three types of biteplate, compared with that in control, but no significant differences were found among any three types of biteplate. In the masseter muscle activity of the group indicating weak occlusal force, significant decrease was found only in application of partial contact biteplate at low clenching levels. 4. In the masseter muscle activity of the group indicating disproportion in right-hand and left-hand occlusal forces, significant decrease was found in application of partial contact biteplates at low clenching levels, compared with that in control. In the masseter muscle activity of the group indicating proportion in right-hand and left-hand occlusal forces, significant decrease was found in application of all three types of biteplate, compared with that in control, but no significant differences were found among any three types of biteplate. Those findings suggest that the nocturnal masseter muscle activity be decreased when given occlusal contact on one side. But when given occlusal contact on lateral sides, the decrease of nocturnal masseter muscle activity is related to maximum occlusal force and the proportion of occlusion, but has no relation to the change of the occlusal area.
九州歯科学会の論文
1999-02-25

咬合力負担領域の変化が睡眠時咬筋活動に及ぼす影響

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