下顎臼歯部に加わる頬および舌の機能圧に関する研究
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概要
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The position where the artificial teeth are arranged to be in harmony with physiological function is named denture space or neutral zone. Their actual state has not yet been clarified. In order to investigate the muscle pressure and morphological characteristics of the neutral zone for lower dentures, muscle pressures exerted on the lower denture flange on swallowing of saliva and warm water were measured. Moreover, the positional relationship of neutral zone to alveolar ridge was discussed. The results were as follows : 1. The muscle pressure of lingual side of the denture flange on swallowing saliva was 1.2 times as large as that of buccal side at premolar region, 1.4 times at molar region when it was measured on imaginary dentition arch (A type). The lingual muscle pressure was significantly larger than the buccal muscle pressure at both regions. 2. The muscle pressure of lingual side of the denture flange on swallowing saliva was 1.4 times as large as that of buccal side at premolar region, 1.0 times at molar region when it was measured on the 2mm outer position at buccal side and 2mm inner position at lingual side than imaginary dentition arch (B type). The lingual muscle pressure was significantly larger than the buccal muscle pressure at premolar region. 3. The muscle pressure of lingual side of the denture flange on swallowing warm water was 1.4 times as large as that of buccal side at premolar and molar regions for A type. The lingual muscle pressure was significantly larger than the buccal muscle pressure at both regions. 4. The muscle pressure of lingual side of the denture flange on swallowing warm water was 1.4 times as large as that of buccal side at premolar region, 1.2 times at molar region for B type. The lingual muscle pressure was significantly larger than the buccal muscle pressure at premolar region. 5. Significant differences were not recognized between the muscle pressure on swallowing of saliva and warm water at every region, except for buccal side at premolar region. 6. The middle point of the neutral zone was 0.3mm more outer than the alveolar ridge at retromolar pad region, and 1.5-1.7mm outer at premolar and molar regions.
- 九州歯科学会の論文
- 1990-12-25