Results: the variation of tooth position gave no effects to the directions of principle stress around apex area in symmetrical occlusal type.
结果：在对称性咬合，牙位的变化对各牙的根尖主应力方向无影响。
A method to improve the tooth shape of mill roller and adopt the built - up-welding with tungsten carbide on the curved surface of tooth apex has been introduced.
提出了一种改进榨辊齿形并在齿顶弧面上堆焊碳化钨的方法及其加工工艺。
Result:Stress concentration was markedly found on the neck and apex of bone-implant and bone-tooth interface;
结果：种植体与天然牙联冠修复时，种植体、天然牙骨界面颈部和根尖部出现应力集中；
Result:Stress concentration was markedly found on the neck and apex of bone-implant and bone-tooth interface;
结果：种植体与天然牙联冠修复时，种植体、天然牙骨界面颈部和根尖部出现应力集中；
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