Examination of potentiality of three dimensional finite element method for predict stress distribution and bone remodeling of occlusal force loaded dental implant.

本研究旨在探讨三维有限元法能否准确预测种植体周围骨组织在咬合力作用下的应力分布。采用三维有限元方法研究了骨结合型羟基磷灰石种植体颈部及种植体颈部周围密质骨的应力分布，骨适应型钛种植体底部周围松质骨的应力分布。用粘贴应力法测定了成年狗下颌骨密质骨的应力分布，结果表明：羟基磷灰石种植体的应力主要分布在颈部和粘结密质骨，而钛种植体的应力主要分布在底部周围的松质骨。成年狗下颌骨内种植体周围骨改建的显微镜观察结果表明，骨改建主要发生在羟基磷灰石种植体颈部的密质骨，而钛种植体底部周围的松质骨则主要发生骨改建。这些结果表明，用三维有限元法检测种植体的强度分布，对预测临床种植体在活骨中的强度分布和骨改建具有潜在的意义。

Purpose of this study was to investigated whether three dimensional finite element method can predict exactly about stress distribution of bone around dental implant which was implanted in living bone and it was loaded of occlusal force. The stresses distributions which were studied by three dimensional finite element method were observed at the neck of bone-bonded hydroxyapatite implant and the compact bone around the neck of implant, while stresses were observed at the cancellous bone around the bottom of bone-adapted titanium implant. Results of stresses distributions which were measured by sticked stress measure on mandibular compact bone of adult dogs showed that stresses were mainly observed at neck part and bonded compact bone of hydroxyapatite implant, whereas stresses were mainly observed at cancellous bone arouund the bottom of titanium implant. Microscopic findings of bone remodelings around implants that were implanted in mandibular bone of adult dogs were showed that the mainlyremodelings of bonewere observed at the compact bone which were bonded to neck part of hydroxyapatite implant, while mainly bone remodelings were obseved at cancellous bone around the bottom of titanium implant. These results suggested that examination of strength distribution of dental implant by three dimensional finite element method has potentiality for predict the strength distribution and bone remodeling of clinically implanted of dental implant in living bone.