OJST  Vol.3 No.6 , September 2013
Prevalence of Dental Anomalies in Norwegian School Children
Abstract: Introduction: Dental anomalies have been widely examined, but no such studies have been conducted in Norway. The purpose of this study was to examine the prevalence of dental anomalies and investigate their possible association with gender and dental occlusion. Methods: Panoramic radiographs and study models of 500, 12-year-old school children (273 girls, 227 boys) were analyzed for the presence of dental anomalies including agenesis, taurodontism, pulp stones, microdontia, macrodontia, impaction, short roots, supernumerary teeth, ectopic eruption and transposition. The subjects were divided into three groups according to the Angle classification (Class Ι, n = 252. Class ΙΙ, n = 227. Class ΙΙΙ, n = 21). Percentages and chi-square test were used for evaluation of the data. Results: In this population 28.2% of the subjects showed at least one dental anomaly. Statistically significant associations were observed between agenesis and Angle Class II dental occlusion (P = 0.03), and between agenesis and gender (P = 0.004). Conclusions: Agenesis was a predominant dental anomaly in girls and was found twice as often in subjects with Class ΙΙ, than with Class Ι dental occlusion.
Cite this paper: Haugland, L. , Storesund, T. and Vandevska-Radunovic, V. (2013) Prevalence of Dental Anomalies in Norwegian School Children. Open Journal of Stomatology, 3, 329-333. doi: 10.4236/ojst.2013.36055.

[1]   Brook, A.H. (1984) A unifying aetiological explanation for anomalies of human tooth number and size. Archives of Oral Biology, 29, 373-378. doi:10.1016/0003-9969(84)90163-8

[2]   Basdra, E.K., Kiokpasoglou, M.N. and Komposch, G. (2001) Congenital tooth anaomalies and malocclusions: A genetic link? European Journal of Orthodontics, 23, 145-152. doi:10.1093/ejo/23.2.145

[3]   Kotsomitis, N., Dunne, M.P. and Freer, T.J. (1996) A genetic aetiology for some common dental anomalies: A pilot twin study. Australian Orthodontic Journal, 14, 172-178.

[4]   Aasheim, B. and Ogaard, B. (1993) Hypodontia in 9-year-old Norwegians related to need of orthodontic treatment. Scandinavian Journal of Dental Research, 101, 257-260.

[5]   Uslu, O., Akcam, M.O., Evirgen, S. and Cebeci, I. (2009) Prevalence of dental anomalies in various malocclusions. American Journal of Orthodontics and Dentofacial Orthopedics, 135, 328-335. doi:10.1016/j.ajodo.2007.03.030

[6]   Peck, S., Peck, L. and Kataja, M. (1998) Class II division 2 malocclusion: A heritable pattern of small teeth in welldeveloped jaws. The Angle Orthodontist, 68, 9-20.

[7]   Basdra, E.K., Kiokpasoglou, M. and Stellzig, A. (2000) The class II division 2 cranio facial type is associated with numerous congenital tooth anomalies. European Journal of Orthodontics, 22, 529-535. doi:10.1093/ejo/22.5.529

[8]   Gupta, S.K., Saxena, P., Jain, S. and Jain, D. (2011) Prevalence and distribution of selected developmental dental anomalies in an Indian population. Journal of Oral Science, 53, 231-238. doi:10.2334/josnusd.53.231

[9]   Ezoddini, A.F., Sheikhha, M.H. and Ahmadi, H. (2007) Prevalence of dental developmental anomalies: A radiographic study. Community Dent Health, 24, 140-144.

[10]   Thongudomporn, U. and Freer, T.J. (1998) Prevalence of dental anomalies in orthodontic patients. Australian Dental Journal, 43, 395-398.

[11]   Ooshima, T., Ishida, R., Mishima, K. and Sobue, S. (1996) The prevalence of developmental anomalies of teeth and their association with tooth size in the primary and permanent dentitions of 1650 Japanese children. International Journal of Paediatric Dentistry, 6, 87-94. doi:10.1111/j.1365-263X.1996.tb00218.x

[12]   White, S.C. and Pharoah, M.J. (2002) Oral radiology principles and interpretation. 6th Edition, Mosby, St. Louis.

[13]   Angle, E.H. (1907) Treatment of malocclusion of the teeth: Angle’s system. S.S. White Manufacturing Co., Philadelphia.

[14]   Ramazanzadeh B.A., Ahrari F. and Hajian S. (2013) Evaluation of tooth size in patients with congenitally-missing teeth. Journal of Dental Research, Dental Clinics, Dental Prospects, 7, 36-41

[15]   Bronoosh, P., Haghnegahdar, A. and Dehbozorgi, M. (2012) Prevalence of taurodontism in premolars and molars in the South of Iran. Journal of Dental Research, Dental Clinics, Dental Prospects, 6, 21-24.

[16]   Ranjitkar, S., Taylor, J.A. and Townsend, G.C. (2002) A radiographic assessment of the prevalence of pulp stones in Australians. Australian Dental Journal, 47, 36-40. doi:10.1111/j.1834-7819.2002.tb00301.x

[17]   Kocabalkan, E. and Ozyemisci, N. (2005) Restoration of severe hypodontia associated with microdontia by using an overdenture: A clinical report. Chinese Medical Journal, 20, 350-352.

[18]   Daskalogiannakis, J. (2000) Glossary of orthodontic terms. Quintessence Books, Michigan.

[19]   Apajalahti, S., Holtta, P., Turtola, L. and Pirinen, S. (2002) Prevalence of short-root anomaly in healthy young adults. Acta Odontologica Scandinavica, 60, 56-59. doi:10.1080/000163502753472014

[20]   Cho, S.Y., Chu, V. and Ki, Y. (2012) A retrospective study on 69 cases of maxillary tooth transposition. Journal of Oral Science, 54, 197-203. doi:10.2334/josnusd.54.197

[21]   Afify, A.R. and Zawawi, K.H. (2012) The prevalence of dental anomalies in the Western region of Saudi Arabia. ISRN Dentistry, 2012, Article ID: 837270. doi:10.5402/2012/837270

[22]   Guttal, K.S., Naikmasur, V.G., Bhargava, P. and Bathi, R.J. (2010) Frequency of developmental dental anomalies in the Indian population. European Journal of Dentistry, 4, 263-269.

[23]   Walkow, T.M. and Peck, S. (2002) Dental arch width in Class ΙΙ Division 2 deepbite malocclusion. American Journal of Orthodontics and Dentofacial Orthopedics, 122, 608-613.

[24]   Magnússon, T.E. (1977) Prevalence of hypodontia and malformations of permanent teeth in Iceland. Community Dentistry and Oral Epidemiology, 5, 173-178.