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.
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