Variations in number and morphology of permanent teeth in 7‐year‐old Swedish children

• Published in: International Journal of Paediatric Dentistry
• Main Authors: Bäckman, B., Wahlin, Y.B.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2001
• Subjects: Northern Sweden
• Online Access: http://dx.doi.org/10.1046/j.1365-263x.2001.00205.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-263x.2001.00205.x; https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-263x.2001.00205.x

Summary. Objectives . To establish the prevalence of numerical and morphological variations of permanent teeth in Swedish 7‐year‐olds and to accept or reject the hypothesis of a higher prevalence for these conditions in northern Sweden compared to other areas. Design . Cross‐sectional. Setting . Department of Odontology/Pedodontics, Umeå University, Sweden. Sample and methods . A total of 739 healthy Caucasian 7‐year‐olds residing in the city of Umeå, northern Sweden in 1976. The children were examined clinically and radiographically. Results . The prevalence of hypodontia (excluding third molars) in girls was 8·4%, in boys 6·5%, and in both sexes combined 7·4%. Of the children with hypodontia, the majority (90·9%) lacked one or two teeth. Lower second premolars were the teeth most frequently missing. The prevalence of hyperdontia was 1·9%; 11 girls and three boys were affected; 78% of the supernumerary teeth were mesiodenses. Of the morphological variations, peg‐shaped upper lateral incisors were found in 0·8% of the children, double‐formation (gemination) in 0·3%, taurodontism in 0·3% and dens invaginatus in 6·8%. One diagnosis was found in 18% of the children, and in almost 8% of them more than one diagnosis was found. Conclusions . The results agree with those obtained in similar populations and are considered representative of this ethnic group. The hypothesis of a genetically determined higher prevalence of numerical and morphological variations in the study population was not verified.