中文摘要：

目的：分析恒牙撕脱性损伤的分布特征。方法：对131名患者共179个撕脱性损伤患牙进行临床特征回顾性研究,包括年龄、性别、病因、牙保存方法、牙离体时间及是否伴有软硬组织伤等,并对观察半年以上且伴有牙槽骨骨折的撕脱性患牙愈后进行统计分析。结果：主要病因为摔伤（59%）,好发于上颌中切牙（78%）。仅3%的人能够在30 min内就医;45%伴发软组织损伤;34%伴发牙槽骨骨折,其中10%牙槽骨骨折在初诊中被漏诊;撕脱性损伤伴牙槽骨骨折牙根吸收率略高于无牙槽骨骨折（P〉0.05）。结论：多数患者由于就诊延误再植牙属于延迟再植;牙撕脱性损伤多伴发软硬组织的损伤,但撕脱性损伤患牙是否伴有牙槽骨损伤与其远期根吸收无明显关联。

英文摘要：

AIM： To analyze the clinical characteristics of avulsion of permanent teeth. METHODS： A retrospective analysis was performed on the dental records of 131 patients with avolsion of 179 permanent teeth. The clinical data of avulsed teeth were collected,and the follow- up period was more than 6 months. The factors were analyzed in relation to postoperative outcomes. RESULTS： Wound in fall was the major reason for tooth avulsion（ 59%）,and the maxillary incisors were the mainly avulsed permanent teeth（ 78%） Tooth avulsion was accompanied with injuries of the alveolar bone in 10% cases,with soft tissue injuries in 45% cases. Only 3% the avulsed teeth were replanted within30 min at Emergency Department. 10% alveolar bone fracture was not diagnosed at the first visit. Tooth avulsion accompanied with and without injuries of alveolar bone on showed no stastitic significance in root resorption（ P 〉 0. 05）. CONCLUSION： Most tooth replantation was delayed due to delayed clinical visit. Alveolar bone fracture may not be correlated with root resorption in avulsed permanent teeth.