치근형 임플란트의 길이 변화가 골응력 증감에 미치는 영향에 대한 유한요소해석적 연구
(A) Study on the Bone Stress Around the Root Analogue Dental Implants of Varying Fixture Lengths by Finite Element Analysis
치과보철 치근형 임플란트 골응력 증감;
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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.