冠桩的长度一般为根长的A.1/4B.1/3C.2/3D.1/5E.1/2

作者: tihaiku 人气: - 评论: 0

问题冠桩的长度一般为根长的

选项

A.1/4
B.1/3
C.2/3
D.1/5
E.1/2

答案 C

解析桩核冠固位形与抗力形要求：桩的长度为根长的2/3～3/4，桩的直径应为根径的1/3。固定桥选择基牙时，基牙牙槽骨吸收不能超过根长的1/3。拔牙的适应证为牙齿其牙槽骨吸收超过根长的2/3。牙体缺损修复时，鸠尾固位形其鸠尾峡的宽度一般为磨牙牙合面颊舌尖宽度的1/3。

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