题目内容
下列关于桩冠固位要求的说法中,错误的是
2021-11-10
A.冠桩长度应为根长的2/3~3/4
B.冠粧直径应为根径的1/3
C.冠粧剖面形态圆形优于栖圆形
D.尽可能保留牙冠组织
E.根管口及根颈部做肩台制备
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