밀도가 다른 치조골에서 임플란트 수복물의 하중위치에 따른 유한요소 분석

Abstract

This study was performed to compare the stress distribution pattern in the crestal cortical bone and cancellous bone using 3-dimensional finite element stress analysis when 2 different Young's modulus(high modulus, model 1; low modulus, model 2) of cancellous bone was assumed. For the analysis, a finite element model was designed to have two square-threaded implants fused together and located at first and second molar area. Stress distribution was observed when vertical load of 200N was applied at several points on the occlusal surfaces of the implants, including central fossa, points 1.5mm, 2mm, 3mm and 4mm buccally away from central fossa, and 1.5mm ligually away from central fossa. The results were as follows; 1. In both model, the maximum Von-Mises stress in the cortical and cancellous bone was greater when the load was applied at points 1.5mm and 2mm buccally away and 1.5mm lingually away from central fossa than other cases. 2. In the cortical bone around first and second molar, model 2 showed greater Von-Mises stress than model 1. 3. In the cancellous bone around first and second molar, model 2 showed greater Von-Mises stress than model 1. It is concluded that when the occlusal contact is afforded, the distribution of stress varies depending on the density of cancellous bone and the location of loading. More favorable stress distribution is expected when the contact load is applied within the diameter of fixtures.