Malformations of the teeth are designated as dental anomalies,
including aberrant dimensions, numbers, morphology, and eruption patterns. Some
studies have shown that dental anomalies can increase the risk of caries and
periodontitis, and can lead to endodontic, aesthetic or orthodontic problems. For little studies
about dental anomalies of children were examined in Norway, the authors of this
paper conducted a study and aimed to examine the prevalence of dental anomalies
in a population of Norwegian school children and investigate their possible
association with gender and dental occlusion.
Diagnostic records:
panoramic and periapical radiographs, dental casts and dental histories of 500 12-year-old
school children (273 girls, 227 boys) were drawn from the growth files of the
Department of Orthodontics, University of Oslo, Norway. The subjects were
divided into three groups according to the Angle classification (Class Ι, n =
252. Class ΙΙ, n = 227. Class ΙΙΙ, n = 21). Data
were evaluated and classified by one of the authors (LH) after calibration with
an experienced orthodontist (VVR). And ten types of
dental anomalies were diagnosed from dental cast and radiographic material: agenesis,
taurodontism, pulp stones, microdontia, macrodontia, impaction, short roots,
supernumerary teeth, ectopic eruption and tooth transposition. Percentages and
chi-square test were used for evaluation of the data.
The results showed
that in this population, 28.2% of the subjects showed at least one dental
anomaly. And the most prevalent dental anomaly was impaction (8.4%), followed
by agenesis (6.6%) and taurodontism (6.2%). Statistically significant
associations were observed between agenesis and Angle Class II dental occlusion
(P = 0.03), and between agenesis and gender (P = 0.004);
none of the other dental anomalies showed significant differences between the
different malocclusion groups or with gender.
All in all, 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.
Article by Linn
Haugland, et al, from Norway.
Full access: http://mrw.so/1VXCli
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