Sodeyama A
Department of Maxillofacial Rehabilitation, Faculty of Dentistry, Tokyo Medical and Dental University.
Kokubyo Gakkai Zasshi. 1996 Dec;63(4):599-619. doi: 10.5357/koubyou.63.599.
The aim of this study was to evaluate the influence of occlusal deficit by loss of bilateral posterior molars in masticatory habituation and how to improve by RPD, investigating the location center of occlusal load (by Prescale Fuji Film Co.) and in its amount, in connection with masticatory muscle activities by analyzing EMG. EMG measurements of masticatory masculature at maximal clenching with pressure indicator, were induced at intercuspal position, confirming by MKG. As controls, seven complete dentate adults were referred, the five mandibular and maxillary bilateral molar-edentate cases each of five were investigated. The results were as follows: i) The location of the center of the occlusal load in dentate mouth was about the midline of the maxillar first molar. ii) In the loss of bilateral molars, the center of the occlusal load was in the first premolar area. iii) By prosthodontic treatments the center of the occlusal load was changed to the second premolar area. iv) These results indicated that the prosthodontic treatment was estimated in physiological imperfection of recovery as yet dentate mouth.
本研究的目的是评估双侧后磨牙缺失导致的咬合缺陷对咀嚼习惯的影响，以及如何通过可摘局部义齿（RPD）进行改善，通过分析肌电图（EMG），研究咬合负荷的位置中心（使用富士Prescale薄膜公司的产品）及其大小与咀嚼肌活动的关系。在正中牙合位，使用压力指示剂诱导咀嚼肌在最大紧咬时进行肌电图测量，并通过下颌运动描记法（MKG）进行确认。作为对照，纳入了7名全口牙齿完整的成年人，对5名下颌和上颌双侧磨牙缺失的病例分别进行了研究。结果如下：i）有牙颌口腔中咬合负荷中心的位置约在上颌第一磨牙的中线处。ii）双侧磨牙缺失时，咬合负荷中心位于第一前磨牙区域。iii）通过修复治疗，咬合负荷中心转移至第二前磨牙区域。iv）这些结果表明，修复治疗在恢复尚未完全达到有牙颌口腔生理状态方面具有一定作用。
