根管治疗时器械折断根管内的常见原因不包括A.器械陈旧有折痕 B.操作方法不当 C.器械质量不佳 D.开髓不充分，进路不通畅 E.根管闭锁

作者: tihaiku 人气: - 评论: 0

问题根管治疗时器械折断根管内的常见原因不包括

选项 A.器械陈旧有折痕 B.操作方法不当 C.器械质量不佳 D.开髓不充分，进路不通畅 E.根管闭锁

答案 E

解析

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