7Andreasen JO,Ravn JJ.Epidemiology of traumatic dental injuries to primary and permanent teeth in a Danish population sample[J].Int J Oral Surg,1972,1(5):235-239.
8Andleasen FM,steinhardt U,Bille M,et al.Bonding of enameldentin crown fragments after crown fracture.An expedmental study using bonding agents[J].Endod Dent Traumatol,1993,9(3):111-114.
9石四箴主编.儿童口腔医学.第2版.北京:人民卫生出版社,2007.112-120.
10Andreasen FM, Steinhandt U, Bille M, et al. Bonding of enam eldentin crown fragm cnts 'after crown fracture. An experim ental study using bond- ing agents. Endod Dent Traumatol, 1993,9 : 111-114.
