Obiective to study the application of root apex locator to diagnose vertical root fracture.
目的研究应用根尖定位仪诊断牙根纵裂。
To explore clinical features of vertical root fracture (VRF) and analyze the possible causes of VRF.
目的观察研究牙根纵裂的临床特征，分析其发病原因。
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。
Objective:To observe the clinical effect of tooth extrusion with progressive methods for anterior teeth with crown-root fracture.
目的观察牙冠延长术治疗断缘位于龈下的冠根联合折断牙的临床效果。
Objective To observe the clinical efficacy of endodontic-orthodontic combined treatment for anterior teeth with crown-root fracture.
目的观察牙体牙髓-正畸方法联合处理恒上前牙冠根折的临床疗效。
In cast metal post and core group 4 teeth were found root fracture, 3 cast metal post and core were loose and 8 teeth were with gingival grey line.
而铸造金属桩核组发生根折4颗、铸造金属桩核脱落3颗，出现牙龈色素沉着8颗。
Methods: 47 cases were analyzed by respective study to analysis the cauese , clinical characters . diagnosis and prevention methods of vertical root fracture.
方法：通过观察4 7例冠根纵折的病例，对牙位、牙髓状态、牙髓治疗情况进行回顾性分析。
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。
Conclusion the fracture strength of premolar teeth filled with light curing composite resin was higher than filled with amalgam after root canal therapy.
结论根管治疗后用光固化树脂充填前磨牙的各类洞，牙体的抗折强度优于用银汞充填者。
Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.
目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。
Objective To compare the resistance to fracture of the root canals after instrumentation or not.
目的比较预备与不预备的根管以及预备后充填与不充填的根管抗折力。
Objective: to observe the effects of different root canal file and the restoration of occlusal surface on the fracture resistance of premolars.
目的：观察不同根管锉预备根管及不同面充填物对前磨牙牙体抗折强度的影响。
File fracture was a frequent complication of root canal therapy.
根管 治疗的常见并发症之一。
File fracture was a frequent complication of root canal therapy.
根管 治疗的常见并发症之一。
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