患者,女,30岁,1周前因外伤至<img src='https://img2.soutiyun.com/shangxueba/ask/18102001-18105000/18103867/2015092411022043155.jpg' />冠折,已做完善根管治疗,检查:冠折断面在龈上、牙齿无松动,无叩痛,咬合关系正常,X线片示<img src='https://img2.soutiyun.com/shangxueba/ask/18102001-18105000/18103867/2015092411022043155.jpg' />根充完善无根折。根管预备时应长度达到根管的()

A.1/2 B. 1/3 C. 2/3 D. 1/4 E. 4/5

时间:2024-03-02 09:29:37

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