Methods Hemisections were performed on reserved canals of incomplete tooth fracture, complete root fracture and furcation involvement after root canal therapy.

方法选择隐裂、根折或根分叉病变患者，对欲保留牙根进行根管治疗后，行半牙切除术。

youdao

Root canal treatment and finished tooth, lost in the pulp cavity nutrition supplies such as nerves, blood vessels, lymphatic, makes itself become more brittle fracture of teeth.

且做完根管治疗的牙齿，失去了牙髓腔中神经、血管、淋巴等营养供应，使得牙齿本身变得较脆易断裂。

youdao

Conclusion: Tooth extrusion method with new method is an effective method for anterior teeth with crown-root fracture.

结论：使用改进的固定矫正器进行牙根牙合向牵引治疗前牙冠根折的方法有效可行。

youdao