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

为探讨全口义齿佩戴者的咀嚼效能与剩余牙槽突缩小的关系，选择我科自行研制的28例全口义齿佩戴者(75.6&lt；正负；4.8岁)。采用本课题组研制的“硅胶复制法”对残存的牙列进行评价。用咬合力计、Seiving法和CT扫描测量咬肌的自主最大咬合力(VMCF)、最大咬合力(MP)和咬肌横截面积。42颗正常年轻齿(25.5(Sys.-2.4岁)作为对照组，用前量表测量其VMCF。此外，他们的下部研究模型复制了通过功能印模获得的正确的颊和舌侧凸缘，通过移除无牙牙脊上的所有完整冠而不进行任何缩小，将其转换为无牙列模型。假想的无义齿基托也通过基板和硅胶复制品进行评估。结果：1.全口义齿佩戴者以VMCF与残牙槽骨的面积、体积和高度为因变量，MP为自变量时，多元回归分析的复相关系数为0.834，VMCF与残牙槽骨的面积偏相关系数较高，是影响咀嚼功能的重要因素。在全口义齿佩戴者中，骨的废弃或功能性萎缩被认为是减少剩余牙槽骨的重要因素。

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.