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。
Methods Hemisections were performed on reserved canals of incomplete tooth fracture, complete root fracture and furcation involvement after root canal therapy.
目的：评价直接数字化影像技术在下颌第一磨牙牙根纵裂诊断中的作用。
Objective:To evaluate the contribution of radiogram in diagnosis of primary vertical root facture in mandibular first molar.
目的分析活髓下颌第一磨牙根纵裂的解剖学病因。
Objective to study the anatomical factors of vertical root fractures (VRFs) on vital pulp of maxillary first molar.
目的研究应用根尖定位仪诊断牙根纵裂。
Obiective to study the application of root apex locator to diagnose vertical root fracture.
目的分析牙根纵裂的致病因素。
Objective to study the pathogenic factors of vertical root fractures (VRFs).
结论：咬颌创伤，牙周疾病，牙髓无活力等是导致牙根纵裂的重要原因。
CONCLUSION: Traumatic occlusal force, periodontal lesions, teeth with root canal therapy are the major causes that led to vertical root fractures.
方法对27例牙根纵裂患者进行临床分析。
结果牙根纵裂好发于40岁以上年龄，以磨牙及前磨牙较为多见，均伴有牙周损害。
Results the predilection age of VRFs was over40 years old, the predilection teeth of VRFs were molars and premolars, and most teeth with VRFs had periodontal lesions.
目的观察研究牙根纵裂的临床特征，分析其发病原因。
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。
To explore clinical features of vertical root fracture (VRF) and analyze the possible causes of VRF.
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