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

本研究旨在为老年部分缺牙患者建立临床可调的人工牙及咬合关系。第一步，作者完成了先进的计算机化研究设备，以监测患者的颌骨运动和肌电活动，并准确地将两者联系起来，分析咀嚼周期，咀嚼运动和负荷的一组部分缺齿，下颌双侧延伸鞍修复插入患者。研究人工咬合面大小和形状对咀嚼运动的影响，以及剩余牙槽嵴形态与对牙的形态关系，评价人工咬合面对部分缺牙患者口腔支持的重要性。本研究对部分缺牙患者在正中牙合最大咬紧状态下的支持能力进行了评价，并与治疗前和义齿安装后进行了比较，结果如下：（1）戴义齿时咀嚼肌肌电活动增加约30%，颞前肌肌电活动增加率高于咬肌肌电活动增加率，（2）戴义齿后咀嚼肌肌电活动增加约2.5倍，戴义齿后增加约3倍，与形态关系及正中咬合稳定性密切相关。

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.