题目内容

下列根管治疗时，开髓的窝洞预备要求中哪一条不正确

A. 应从髓角最高处进入髓室顶
B. 开髓窝洞外形同髓室顶形态
C. 髓窝洞应使根管治疗器械可直达根尖部
D. 开髓窝洞制备应尽量保留无龋坏的牙体组织
E. 开髓窝洞壁可以形成台阶

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