지대주의 일체형 및 분리형에 따른 내측연결시스템 임플랜트의 유한요소 응력분석

Abstract

The design of implant abutment can be classified as a one-piece abutment like the solid abutment and a two-piece abutment like the separating abutment part and the abutment screw part. The difference between both designs will effect the stress distribution of the implant. The purpose of this study was to compare the one-piece with the two-piece abutment connected to the internal connection implant using 3-dimensional finite element analysis. For a finite element model of the one-piece and the two-piece abutment, Solid abutment (Osstem Co.,Ltd.,Korea) and ComOcta abutment (Osstem Co.,Ltd.,Korea) were selected. Vertical and 20° oblique loads of 200N were applied to each model. 2 types of bone quality was good(2.0 mm cortical bone thickness and dense cancellous bone) and poor(0.5 mm cortical bone thickness and low cancellous bone). The results were as follows : 1. There was no difference between Solid abutment and ComOcta abutment in von Mises stresses of bone. 2. In von Mises stresses of abutment, loading to the abutment was concentrated mainly by the morse taper in the one-piece abutment but was concentrated by not only the morse taper but the neck of the abutment screw and the middle part of the screw at the cortical bone height. 3. When the bone quality was poor, the stress to the bone was concentrated on the cortical bone, and the stress to the abutment was moved to the level of the cortical bone and was concentrated in the lower part of morse taper, the stress to the abutment screw was concentrated at the middle part of the screw at the cortical bone height and the stress to the fixture was concentrated in its neck. In conclusion, there was no difference in von Mises stresses of bone between the one-piece and the two-piece abutment. However, the stress to the abutment screw of the two-piece abutment was greater than that to the thread of the one-piece abutment.