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引起根管壁侧穿的原因不包括

单选题
2021-09-01 23:57
A、根管治疗时预备不良,已形成薄壁
B、操作粗糙,未及时校正方向或圆钻直径过大,速度过快
C、使用超声根管治疗仪操作不当
D、根管壁有继发龋坏
E、失败重做的桩冠,去除冠桩时不慎
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正确答案
C

试题解析

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