题目内容
下列对冠桩的描述中,错误的是
2021-11-10
A.冠桩长度约为根长的2/3~3/4
B.冠桩长度应为根径的2/3
C.冠桩呈锥形,与根管壁密合
D.冠桩的形态椭圆形优于圆形
E.冠桩的固位力是摩擦力和黏固力
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