Relationship between Occlusal/Masticatory Performance and Residual Ridge Reduction in Complete Denture Wearers

为探讨全口义齿患者的咀嚼效能与残牙槽嵴减少的关系，选择了28例（75.6 ± <plus-minus>4.8岁）自行研制的全口义齿患者。用本课题组提出的“硅胶复型法”评价其残留牙槽嵴。采用咬合力仪、筛选法和CT扫描测量其最大咬合力（VMCF）、最大咬合力（MP）和咬肌横截面积。42例正常青年牙（25.5（[SY. ±. [2.4岁]为对照组，采用Pre-Scale测量VMCF。此外，通过去除无牙嵴上所有完整的牙冠，将通过功能印模获得的再现适当颊侧和舌侧凸缘的下研究模型转换为无牙模型，而不进行任何复位。并通过基托和硅树脂复型对他们的无牙基托进行了评价。以VMCF和残牙槽嵴底面积、体积和高度为因变量，以MP为自变量，全口义齿患者VMCF和残牙槽嵴底面积的偏相关系数为0.834，VMCF和残牙槽嵴底面积的偏相关系数较高，是影响咀嚼功能的重要因素.骨废用或功能性萎缩被认为是全口义齿佩戴者剩余牙槽嵴减少的重要因素。

To elucidate the relationship between masticatory performance (MP) and reduction of the residual ridge in complete denture wearers, 28 complete denture wearers (75.6<plus-minus>4.8yrs) whose dentures were developed by our department were selected. Their residual ridges were evaluated by the "silicone replica method" developed by our group. Their voluntary maximal clenching force (VMCF), MP and cross sectional area of masseter muscle were measured by an occlusal force meter, the seiving method and CT-scan. Forty two normal young dentates (25.5([SY.+-.[)2.4yrs) were selected as the control group and their VMCF were measured by a Pre-Scale. Moreover, their lower study casts reproducing proper buccal and lingual flange obtained by a functional impression were converted into edentulous casts by removing all crowns that were intact on the edentulous ridge without any reduction. Their assumed edentulous denture foundations were also evaluated by a baseplate and silicone replicResults obtained were as follows1. When VMCF and basal area, volume and height of residual ridge replica were dependent variables, and MP was an independent variable, multiple correlation coefficient on multiple regression analysis was 0.834 in complete denture wearers.VMCF and basal area of residual ridge indicated a high value in the partial correlation coefficient and were confirmed to be an important factor in masticatory function.2. Bone disuse or a functional atrophy were supposed to be a significant factor in the reduction of the residual ridge in complete denture wearers.