Observations of Dental Disease and Anomalies in 9- to 11-Year-Old Norwegian Children

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Abstract
Sets of intraoral radiographs consisting of ten periapicals and, in most cases, two posterior bitewings, from 99 girls and 101 boys aged 9–11 years were examined by four dentists. The study was undertaken to quantitate the disease and anomalies present in the sample and investigate the inter-examiner variability of the diagnosis. Each of the examiners independently recorded the disease and anomalies from the radiographs. Knowledge of previous dental treatment and abnormalities noted by the community dental officers were obtained from the children's dental records. The prevalence of disease and anomalies in the sample was low. Considerable examiner variability revealed a need for more objective criteria for the radiographic diagnosis of some of the dental anomalies. Girls had a significantly higher DMFT than boys. Hypodontia was found in 13 children, and dens invaginatus class III/IV (9) was observed on radiographs from 5 children.