题目内容
有关恒牙髓腔的叙述，错误的是
2022-02-17
A.上前牙开髓部位在舌面窝
B.上前牙根管粗，根管治疗效果好
C.活髓牙作针道时应避开牙髄
D.下颌双尖牙根管治疗时防侧穿
E.下颌磨牙髓室顶底相距较远
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