Article Title and Bibliographic Information: Socio-environmental Factors Associated with Dental Occlusion in Adolescents. Frazao P, Narvai PC. Am J Orthod Dentofacial Orthop 2006;129(6):809-16. Level of Evidence: 3b. Purpose/Question: Which are the sociodemographic, environmental, and clinical factors associated with severe and very severe malocclusions? Source of Funding: Ministry of Health, Brazil. Type of Study/Design: Cross-sectional analytical study. © 2007 Elsevier Inc. All rights reserved.