치과용 임프란트의 식립후 약 3-6개월의 초기 적응 기간 중에는 임프란트와 그 주위의 골조직간에 유착 이 일어나 임프란트와 골간의 경계면을 가로지르는 하중전달경로가 이루어지게 된다. 임프란트 상부에 보철물이 장착되고 임프란트 보철물이 저작력 등 기 능하중을 지탱하기 시작함에 따라 골조직에는 응력이 작용하게 되는데 그 크기와 빈도에 상응하는 골의 반 응이 일어난다.
Dental implants of different lengths but of the same fixture diameters were investigated to analyse the influence of fixture dimensions on the bone stress. Root analogue Frialit-2 Synchro models of diameter 4.5mm and the length 8, 10, 13, and 15mm placed within the jaw bone were modelled axisymmetrically for finite element analysis. Primary consideration was given to the stress at the cortical bone around the implant fixtures where the acute stress concentration was likely to take place thereby eliciting the higher risk of bone resorption. Axisymmetric vertical load of 50N as well as non-axisymmetric lateral load of 20N were taken into consideration as load conditions. The results of present study indicated that the stress decreased rapidly as the length of implant increased from 8mm to 13mm, but the reduction in the stress got less significant with the implant length of beyond 13mm. Similar trends in the stress pattern were observed for the both load cases. Result of the normalized stress, however, indicated that for longer implants the reduction in the stress was less than what was arithmetically attainable as a result of the increased implant/bone contact area. It was concluded that the benefit of implant of longer than 13mm was less obvious in terms the bone stress.
I. 서 론 II. 재료 및 방법 Ⅲ. 성적 Ⅳ. 고찰 Ⅴ. 결론 REFERENCES
