1. 2. JO Andreasen, and F. Andreasen, Textbook and color atlas of traumatic injuries to the teeth . 1st ed. Copenhagen: Munksgaard, 1994 ; 383 -425 .
2. 3. Protocols for clinical pediatric dentistry . 3rd ed. Boston: The Journal of Pedodontics, 1995 ; 31 -2 .
3. 4. G Roberts, and P. Longhurst, Oral and dental trauma in children and adolescents . 1st ed. New York: Oxford, 1996 ; 77 -80 .
4. Challenges in clinical dental traumatology