Aoki H, Ozeki K, Ohtani Y, Fukui Y, Asaoka T
Frontier Research and Development Center, Tokyo Denki University, Ishizaka, Hatoyama, Hiki, Saitama 350-0394, Japan.
Biomed Mater Eng. 2006;16(3):157-69.
Three-dimensional finite element analysis was performed for thin hydroxyapatite (HA) coated and titanium dental implants to study the effects on stress/strain distribution in the mandible with application of axial and oblique loads. The implants were of screw and cylinder types. With an axial load, the maximum equivalent bone stresses in the titanium implants were 21.5 and 29.0 MPa for the cylinder and screw types respectively, and the stress and strain distributions differed. For the cylinder type, the highest stress was located at the implant base, and for the screw type, it was located at the top edge of the first thread within the cortical bone. For the HA-coated cylinder and screw implants, the maximum equivalent bone stresses were 7.1 and 7.2 MPa respectively. The stress and strain distributions were similar, and the highest stress was located on the upper side of the cortical bone around the implant neck for both implants. Of the implants examined, the screw type HA-coated implant had the most uniform stress distribution in bone.
对薄羟基磷灰石（HA）涂层和钛牙种植体进行了三维有限元分析，以研究在施加轴向和斜向载荷时对下颌骨应力/应变分布的影响。种植体有螺钉型和圆柱型。在轴向载荷作用下，圆柱型和螺钉型钛种植体的最大等效骨应力分别为21.5和29.0MPa，应力和应变分布不同。对于圆柱型，最高应力位于种植体底部；对于螺钉型，最高应力位于皮质骨内第一螺纹的顶部边缘。对于HA涂层的圆柱型和螺钉型种植体，最大等效骨应力分别为7.1和7.2MPa。应力和应变分布相似，两种种植体的最高应力均位于种植体颈部周围皮质骨的上侧。在所检查的种植体中，螺钉型HA涂层种植体在骨内的应力分布最均匀。
