fa Dental crowding ارتودنسی Orthodontics پژوهشي Research <p> <strong>Objective:</strong></p><p>  To evaluate the role of genetics and tooth wear in the etiology of dental crowding through the analysis of a split indigenous Amazon population. </p><p> <strong>Materials and Methods</strong>:</p><p>  Dental crowding prevalence (n  =  117), tooth wear (n  =  117), and inbreeding coefficient (n  =  288) were compared for both villages. A biometric investigation was performed by dental cast analysis of 55 individuals with no tooth loss. Mann-Whitney statistics, independent t-tests, and Fisher exact tests were used at P < .05. </p><p> <strong>Results</strong>:</p><p>  A high coefficient of inbreeding was confirmed in the resultant village (F  =  0.25, P < .001). Tooth wear was not significantly different (P  =  .99), while a significantly higher prevalence of dental crowding was confirmed in the original village (PR  =  6.67, P  =  0.02). Forty dental arches (n  =  20) were examined in the new group, and only one (2.5%) had a dental crowding ≥5 mm. In the original villages, we found 20 arches (28.6%) with dental crowding. No difference was observed for tooth size, while larger dental arch dimensions explained a lower level of dental crowding in the resultant village. </p><p> <strong>Conclusions:</strong></p><p>  Our findings downplay the widespread influence of tooth wear, a direct evidence of what an individual ate in the past, on dental crowding and emphasize the role of heredity, exacerbated through inbreeding, in the etiology of this malocclusion. </p><hr><p></p><p> <strong>Source: </strong>The Angel Orthodontists</p><p> <a href="http://www.angle.org/doi/abs/10.2319/020112-91.1" target="_blank"><font color="#0000ff">Full Text</font></a></p> Orthodontics, Tooth attrition, Epidemiology, Malocclusion, Inbreeding, Indigenous population 0 0 http://idai.ir/browse.php?a_code=A-10-32-1907&slc_lang=fa&sid=1 David Normando davidnormando@hotmail.com 10031947532846008929 10031947532846008929 Yes Department of Orthodontics, Federal University of Pará, Faculty of Dentistry, Belém, Brazil Marco A.O. Almeida 10031947532846008930 10031947532846008930 No Department of Orthodontics, State University of Rio de Janeiro, Rio de Janeiro, Brazil Cátia C. A. Quintão 10031947532846008931 10031947532846008931 No Department of Orthodontics, State University of Rio de Janeiro- UERJ, Rio de Janeiro, Brazil