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方法能否准确预测牙种植体在咬合力作用下种植体周围骨的应力分布情况。用三维有限元方法研究了骨粘结型羟基磷灰石种植体颈部和种植体颈周围密质骨的应力分布，而骨适应钛种植体底部周围的松质骨则观察到应力分布。对成年犬下颌骨密质骨应力分布的测量结果表明，羟基磷灰石种植体的应力主要分布在颈部和粘结密质骨，而钛种植体底部的松质骨应力主要分布在松质骨附近。成年犬下颌骨种植后种植体周围骨改建的光镜观察表明，骨改建主要发生在与羟基磷灰石种植体颈部粘结的致密骨处，而钛种植体底部周围的松质骨骨改建主要发生在松质骨处。这些结果表明，用三维有限元方法检测种植体的强度分布，有可能预测临床种植的种植体在活骨中的强度分布和骨改建。

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.