1. Clarkson BH, Longhurst P, Sheiham A: The prevalence of injured anterior teeth in English school children and adults. J Dent Child. 1973, 4: 21-24.
2. Jarvinen S: Fractured and avulsed permanent incisors in Finnish children. A retrospective study. Acta Odontol Scand. 1979, 37: 47-50.
3. Baghdady VS, Ghose LJ, Enke H: Traumatized anterior teeth in Iraqi and Sudanese children-A comparative study. J Dent Res. 1981, 60: 677-680.
4. Otuyemi OD, Sofowora CA: Traumatic anterior dental injuries in selected rural Primary school children in Ile-Ife, Nigeria. Nig Dent J. 1991, 10: 20-25.
5. Akpata ES: Traumatised anterior teeth in Lagos school children. Nig Med J. 1969, 6: 40-45.