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중간 지대치 구조에 따른 단일 임플랜트의 삼차원 유한요소법적 응력 분석
심덕보,정재헌 朝鮮大學校 口腔生物學硏究所 1998 口腔生物學硏究 Vol.22 No.1
The attraction to endosseous implants lies in the potential for improved function, esthetic, and more favorable stress distribution in the superior prostheses, fixture and supporting bone. Implant for single tooth replace is especially needed esthetics, and that was mainly established by use of various superstructure. The purpose of this study was to compare the stresses and displacement in implant prosthesis and fixture, and supporting bone according to abutment type between fixture and superstructure. Using the finite element method, this study modeled 4.0×14㎜ cylindrical type implant fixture with the external hexed type of 0.75㎜, and two models are completed. Model A has one unit abutment type that is connected between intermediate abutment and retaining screw. Model B is separated between intermediate abutment and retaining screw. Model B is separated between intermediate abutment and retaining screw. The vertical load of 200N and 30°lateral load of 100N was applied at the cusp tip of the prostheses. The results were as follows : 1. Under vertical load of 200N, the maximum principal stress was 65.49 ㎏F/㎟ on the model A, 60.64 ㎏F/㎟ on the model B. The minimum principal stress was -44.39 ㎏F/㎟ on the model A, -34.93 ㎏F/㎟ on the model B. The von mises stress was represented 66.93 ㎏F/㎟ at the model A, 60.05 ㎏F/㎟ at the model B. 2. Under 30° lateral load of 100N, the maximum principal stress was 34.77 ㎏F/㎟ on the model A, 26.74 ㎏F/㎟ on the model B. The minimum principal stress was -24.89 ㎏F/㎟ on the model A, -15.77 ㎏F/㎟ on the model B. The von mises stress was represented 35.09 ㎏F/㎟ at the model A, 26.38 ㎏F/㎟ at the model B. 3. Under vertical load of 200N, the amount of displacement was 0.278㎜ on the ;model A, 0.187㎜ on the model B. So, the amount of displacement was larger at the model A than at the model B and displacement is occured to given load direction. 4. Under 30°lateral load of 100N, the amount of displacement was 0.337㎜ on the model A, 0.260㎜ on the model B. So, the amount of displacement was larger at the model A than at the model B and displacement is occured to counter direction of load. As the results of this study, in case of using one unit abutment that is connected between abutment and fastening screw, large displacement and stress was occured. The results means on unit type intermittent abutment more occured fasening screw loosening and fracture, fracture of fixture hex.