2종의 임플란트 내부결합구조체에 따른 치조골상 유한요소응력 분석
Finite Element Stress Analysis of Bone Tissue According to the Implant Connection Type
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임플란트 고정체-지대주 결합구조체의 형태에 따른 교합부하의 반응이 다양하여 본 연구에서는 하중위치 및결합구조체 접촉 비율에 따라 3단 계단형 결합구조체와 경사형에서 어떠한 차이가 있는 지를 3차원 유한요소분석을 시행하였다. 2종의 임플란트-지대주 결합 구조체에 연결된 상부 치관을 제작하여 각 치관에 설정된 하중위치에 200 N의하중을 부여하였다. 임플란트 중심 부위에서 하중조건이 멀어질수록 피질골정에 가해지는 응력이 증가되기에하중조건은 응력발생에 영향을 미치는 주요 요소이며 다음으로 결합구조형태에도 영향을 받았다. 또한 수직 하중에 비해 빗금 경사 하중이 부여된 경우 계단형은 경사형에 비해 유리한 응력 분포를 보였다. 그리고 지대주 결합구조체가 고정체의 내벽에 대해 접촉이 많아 질수록 골질에 대한 응력분산이 유리한 것으로나타났다. 결론적으로 고정체 폭경에서 벗어난 빗김 수직 및 경사 하중은 결합구조체의 종류와 관계없이 피질골정에 응력을 집중시키므로 저작기능시 교합접촉면을 고정체의 폭경 내에 위치하도록 하는 것이 생체역학적으로 바람직 할 것으로 사료되었다.
Abstract
The purpose of this study was to make the stress distribution produced by simulated different load under two types of internal connection implant system (stepped and tapered type) by means of 3D finite element analysis,The finite element model was designed with the parallel placement of the one fixtures (4.0 mm×11.5 mm) with reverse buttress thread on the mandibular 1st molar. Two models were loaded with 200 N magnitude in the vertical direction on the central position of the crown, the 1.5mm and 3 mm buccal offset point from the central position of the fixture. The oblique load was applied at the angle of 30on the crown surface. Von Mises stress value was recorded and compared in the fixture-bone interface in the bucco-lingual dimension. The results were as follows;1. The loading conditions of two internal connection implant systems (stepped and tapered type) were the main factor affecting the equivalent bone strain, followed by the type of internal connections. 2. The stepped model had more mechanical stability with the reduced max. stress compared to 11tapered models under the distributed oblique loading. 3. The more the contact of implant-abutment interface to the inner wall of implant fixture, the less stress concentration was reduced.
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