Journal Article

Prevalence of asymmetric molar and canine relationship

Faraj Behbehani, Rino Roy and Badreia Al-Jame

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 34, issue 6, pages 686-692
Published in print December 2012 | ISSN: 0141-5387
Published online July 2011 | e-ISSN: 1460-2210 | DOI:
Prevalence of asymmetric molar and canine relationship

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The purpose of this study was to investigate the prevalence and severity of occlusal asymmetries in the molar and canine regions in a large population-based sample of adolescent Kuwaitis. Using a stratified cluster sampling method, 1299 Kuwaiti adolescents (674 boys mean age 13.3 years and 625 girls mean age 13.2 years), representing approximately 6.7 per cent of that age stratum in the population, were examined clinically for sagittal molar and canine relationships, with a view to recording half and full-step asymmetries. In this sample, 1244 subjects were examined clinically, while for the remaining 55, pre-treatment study models were assessed. All subjects were in the early permanent dentition stage. Descriptive statistical analyses were used to determine the proportion of different molar and canine asymmetries.

Antero-posterior asymmetries were found to be a distinctive and common feature of the dental arches, with half-step outweighing full-step asymmetries both in the anterior and posterior regions. The total prevalence of an asymmetric molar or canine relationship was 29.7 and 41.4 per cent, respectively, with more than 95 per cent falling in the mild category. Patient gender did not influence the prevalence or magnitude of asymmetry. The results showed a clinically significant prevalence of asymmetric molar and canine relationships, which were mainly in the category of half-step asymmetry. Class II half and full-step asymmetries were more prevalent than Class III asymmetries in the molar and canine regions.

Journal Article.  3293 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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