通过手术方法去除小型猪第一磨牙牙颈部的牙槽骨和牙周韧带，从而形成牙周损害。
The periodontal lesion was generated in the first molars area of miniature pigs by the surgical removal of bone and subsequent silk ligament suture around the cervical portion of the tooth.
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.
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.
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