Avaliação da espessura do esmalte proximal em segundos pré-molares superiores humanos e sua correlação com o diâmetro mésio-distal
Abstract
A determinação da espessura do esmalte proximal à altura do ponto de contato é de grande importância, visto que o desgaste desta região dental é freqüentemente utilizado na clínica ortodôntica com a finalidade de correção de discrepâncias dentais e estabilidade do tratamento. Com o intuito de determinar os valores do diâmetro mésio-distal e aferir os valores médios da espessura do esmalte nas faces proximais à altura do ponto de contato, foram avaliados 42 segundos pré-molares superiores. Os diâmetros mésio-distais foram mensurados com auxílio de um paquímetro digital, em seguida foram incluídos em resina e seccionados obtendo-se uma lâmina central de 0,7 mm de espessura, possibilitando a medição da espessura do esmalte em um perfilômetro de precisão milesimal. Com base nos dados obtidos, também foram analisadas as possíveis correlações entre a espessura do esmalte nas faces proximais e o diâmetro mésio-distal. Os resultados indicaram que o valor médio do diâmetro mésio-distal é de 6,85 mm para o segundo pré-molar superior e com espessura media do esmalte de 1,101 mm na mesial e 1,157 mm na distal. De acordo com os testes de Spearman e Pearson foram encontradas correlações estatisticamente significantes no lado direito entre a espessura do esmalte na face mesial e o diâmetro mésio-distal, entre a espessura na face distal e o diâmetro mésiodistal. No lado esquerdo foram encontradas correlações positivas entre a espessura do esmalte distal e o diâmetro mésio-distal. Em ambos os lados houve correlações estatisticamente significantes entre a espessura do esmalte mesial e a espessura do esmalte distal. Independente do lado, a espessura média do esmalte é maior na face distal que na mesial.
UNITERMOS: ortodontia; pré-molar; espessura de esmalte; diâmetro dental.
SUMMARY
The thickness determination of adjacent enamel at the height of the contact point is very important, seem that the erosion of this dental part is often used in orthodontic clinic to know the dental divergence and treatment stability correction. With the intention to determinate the mésio-distal diameter values and give the thickness average values of enamel in the adjacent sides at the contact’s point height, were rated 42 second superior pre-molar teeth. The mésio-distal diameter, were measured with digital pachymeter help and then, were included in resin and cut, having a central foil of 0,7 mm (thickness), allowing the tickness enamel measure in millesimal precision outline machine. Considering that were also analysed the relationship possibilities between the enamel thickness at the proximal face and mésio-distal diameter. The results show that the medium value of the mesio-distal diameter is 6,85 mm to the second superior pre-molar tooth and with the average’s thickness of enamel 1,101 mm at mesial and 1,157 mm at distal. According with Spearman and Pearson’s testes were found significant statistically correlation at the right side between the enamel thickness mesial face and mesio distal diameter, between the tickness at distal face and mesio distal diameter. At the left side were found positive correlations between the distal enamel thickness and mesio distal diameter. In both sides, there were significant statistically correlation between the distal enamel thickness and mesio distal diameter. In both sides, there were significant statistically correlation between the mesial enamel thickness and distal enamel thickness. Independent of the side, the enamel thickness average is bigger at distal face than mesial.
UNITERMS: orthodontics; second upper bicuspid; enamel thickness; crown diameter.
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