Dental trauma may happen to a single tooth or more. Avulsion was most like to accompany with other traumatic teeth. Crown fracture was also like to involve more than one tooth.
牙创伤可以在单颗牙齿发生也可累及多颗牙，牙脱出最容易累及多颗牙，冠折也常累及多颗牙。
2
Since pulp injuries are reported in tooth fracture, displacement and avulsion, it is commonly thought that pulp injuries were involved in almost every type of dental injuries.