Estudo transversal da evolução da dentição decídua: forma dos arcos, sobressaliência e sobremordida

Abstract

The aim of this study was to evaluate the characteristics (shape of dental arches, overjet and overbite) of the primary dentition of 6- to 39-month-old children from four nurseries of Rio de Janeiro, Brazil, and to associate them to gender and dentition phase. It was observed that 68.6% of the children presented round upper arch, while 31.4% had triangular upper arch; 92% of the children presented U-shaped lower arch and 8% had square-shaped lower arch. Moderate overjet was observed in 38.3% of the children, and slight overjet, in 30.3%. Severe (26.6%) and negative (25.5%) overbites were the most prevalent modalities of that condition. There was no association between gender and the studied characteristics. There was statistically significant association between the dentition phase and the shape of the arch, overjet and overbite (p < 0.001, chi-square test). It was possible to observe, in the present study, that early signs of malocclusions appeared when first primary molars erupted, as the posterior vertical dimension of occlusion increased. It was, thus, verified that early signs of malocclusions appear as the primary dentition develops. It is very important that the first dental visit occur during the first year of age, since it allows the pediatric dentist to prevent or carry out an early diagnosis of malocclusions in the primary dentition.

Prevalence of and factors affecting malocclusion in primary dentition among children in Xi’an, China

“…In the preliminary stage of occlusal establishment, the lower dental arch is located in a distal position, exhibiting a vertical or distal terminal plane for the primary molars [25], corresponding to Angle’s II occlusion for the permanent dentition. Children with primary dentition usually have a higher risk of developing increased overjet.…”

Prevalence of Posterior Cross Bite in 3-5-Year-Old Children from Vitória, Brazil

“…The genetic factor is predominant in the growth and development pattern of arches, also influenced by environmental factors, oral functions, breathing pattern and nutritional quality [10,11]. With regard to occlusion of the deciduous dentition, functional factors are considered determinants for the development of malocclusions [11].…”

Prevalência de más oclusões em crianças com 12 a 36 meses de idade em João Pessoa, Paraíba

“…Os resultados obtidos neste estudo foram semelhantes aos relatados na literatura 6,12,20,27 no que diz respeito à prevalência da mordida aberta anterior e da mordida cruzada posterior (Tab. 1).…”

“…É possível observar um aumento significativo das más oclusões com a irrupção dos primeiros molares decíduos e elevação da dimensão posterior 6 . Dessa forma, torna-se extremamente importante que a primeira visita odontológica ocorra no primeiro ano de vida, possibilitando ao odontopediatra a prevenção e o diagnóstico precoce de más oclusões na dentadura decídua em desenvolvimento.…”