치근형 임플란트 직경의 증가에 따른 골응력 감소 효과에 대한 유한요소해석법을 이용한 분석
Finite Element Analysis of the Influences of the Implant Diameter on the Cortical Bone Stress
치의학과 치과보철학 전공
치과보철 치근형 임플란트 골응력;
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Root analogue dental implants of the Frialit-2 Synchro models placed in the alveolar bone of thickness 11.5mm were axisymmetrically modelled for a series of finite element analyses. Five commercially available fixture models of which the diameter were 3.4, 3.8, 4.5, 5.5, and 6.5 mm, with the same length of 15mm, were analysed in order to investigate the influence of fixture diameters on the bone stress. Main 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. The axisymmetric vertical load of 50N as well as the non-axisymmetric lateral load of 20N were taken into consideration as load conditions. The results of present study indicated that the stress at the cervical cortical bone increased rapidly as the diameter of implant fixture decreased. Virtually the same trends in the stress reduction phenomena were observed for both the load cases. Comparison of the normalized stress indicated that for implants of larger diameters the stress reduction ratio was far greater than a simple arithmetic reduction in the stress due to the increased implant/bone contact area.