牙折,toothfracture,docin/sundae_meng,病因,外力直接撞击,咀嚼咬到沙石、碎骨等硬物。beimpactedbyforce,bitinghardfood.,Etiology,docin/sundae_meng,临床表现,Cliniccharacteristics,按部位分:,冠折,Crownfracture,根折,Rootfracture,冠根联合折,Crown-rootfracture,docin/sundae_meng,按损伤和牙髓关系分:,露髓,不露髓,docin/sundae_meng,冠折crownfracture,前牙:横折、斜折,Anteriortooth:horizontalorinclined,docin/sundae_meng,后牙:斜折、纵折,Posteriorteeth:inclinedorvertical,docin/sundae_meng,根折rootfracture,docin/sundae_meng,颈1/3、根中1/3、根尖1/3,cervix-thirds,middle-thirds,apical-
