关键词: 牙撕脱性损伤, 再植牙, 牙根吸收, 根面处理, 干细胞治疗

Abstract: The prognosis of tooth avulsion is poor in dental trauma. At present，dental replantation is generally used in the treatment of permanent tooth avulsion. The periodontal tissue activity of root surface at replantation is very important to its prognosis. Clinical investigations show that the replantation of avulsed teeth is mostly delayed replantation，while the periodontal ligament remaining on the root surface of the isolated tooth will be dehydrated and necrotic in a dry state，which is the main reason for pathological absorption after replantation. The International Dental Trauma Association recommends that appropriate treatment measures be taken at delayed replantation to promote periodontal healing and regeneration of replanted teeth，reduce pathological absorption，and extend the service life of replanted teeth. This article summarizes the related literatures of promoting periodontal healing of replanted teeth based on the 2020 edition of treatment guidelines for avulsed teeth by the International Dental Trauma Association，including root surface treatment，medicine and the application of stem cell therapy in replantation. 

Key words: tooth avulsion, tooth replantation, root resorption, root surface treatment, stem cell therapy