An investigation for adjustable artificial teeth form and occlusion in aged partially edentate mouth.

本研究的目的是为老年部分缺牙患者建立临床可调整的义齿和咬合。第一步，作者完成了复杂的计算机化研究设备，以监测患者的下颌运动和肌电活动，并准确地将两者联系在一起。分析部分牙齿组的咀嚼周期、咀嚼运动和负荷，并插入下颌双侧伸展鞍形修复体。此外，还研究了改变人工咬合面的大小和形状对咀嚼运动的影响，以及剩余牙槽骨形态与对位牙的形态关系，从而评价了支撑对部分无齿口的重要性。对部分无牙患者在正中牙合最大咬合时的支撑能力进行了评价，并与戴义齿前后进行了比较，结果表明：1)义齿植入时咀嚼肌活动度增加约30%，前额肌I-EMG值增加幅度大于咬肌；2)矫治1年后咀嚼肌活动度增加约2.5倍，戴义齿时增加约3倍，与正中牙合的形态关系和稳定性密切相关。

This investigation is undertaken for the purpose of establishing clinically adjustable artificial teeth and occlusion on aged partially edentate patient. At the first step, author completed sophisticated computerised research equipment to monitor patient's jaw movements and electromyographic activity,and to relate the two together accurately.Chewing cycles,masticatory movements and load were analysed on the group of partially edentate, and mandibular bilateral extension saddle prosthodontics were inserted patients. Also the effects of changing the size and shape of the artificial occlusal surfaces on masticatory movement were studied,and the morphological relation of the residual ridge form and opposing teeth,then the importance of support for partially edentate mouth was assessed. An evaluation of the supporting ability of partially edentate patient at maximal clenching in centric occlusion was carried out, compared with pre-treatment and after denture insertion.The results were as follows:i) The masticatory muscle activity was increased about 30 percent at the denture insertion, the rate of increasing I-EMG value of anterior temporal muscle was higher than that of masseter mascle.ii) The masticatory mascle activity increased about 2.5 times after one year treatment,and about 3 times when denture was worn,and these markedly related morphological relation and stability of centric occlusion.