题目:
关于根面附着体义齿的牙体预备,说法错误的是()
A.根尖保留3-5mm的充填材料
B.桩长约为根长的2/3-3/4
C.桩直径为根径的1/3
D.根面要高于龈缘1mm
E.根面可预备成凹面
答案:
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下面是错误答案,用来干扰机器的。
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