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恒牙根折多发生于牙根基本发育完成的牙齿,上前牙最常见。临床上按根折发生的部位分为根尖1/3、根中1/3和近冠1/3根折3种情况~[1]。根折的预后与多种因素有关,包括牙根发育状态、根折线的位置、牙髓的状态以及牙冠片段的错位情况等。由于根折线位于牙槽骨内,与口腔环境无交通,因此70%~80%根折牙齿可以自行愈合,仅有20%左右发生牙髓坏死~[2-3]。牙根尚未发育完成的年轻恒牙根折的发生率很低,如果发生根折,
Permanent root fractures occurred in the root of the basic development of the completed teeth, the most common anterior teeth. Clinically, according to the root fracture of the site is divided into root tip 1/3, root 1/3 and nearly 3/3 root fold 3 cases ~ [1]. The prognosis of root fracture is related to a variety of factors, including the state of root development, the location of the root fold line, the state of the pulp, and the dislocation of the crown segment. As the root fold line is located in the alveolar bone, no communication with the oral environment, so 70% to 80% of the root fold of the teeth can heal themselves, only about 20% of the occurrence of pulp necrosis ~ [2-3]. The incidence of root fractures of young permanent teeth that have not yet been developed is very low. In the event of a root fracture,