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Publication
Impacto da cor do substrato na estética das facetas
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Advisor(s)
Abstract(s)
Objetivo: O objetivo deste estudo compreende a avaliação in vitro das alterações de cor da cerâmica feldspática, quando utilizados diferentes cores de substratos, fazendo variar a espessura da cerâmica.
Materiais e Métodos: 40 amostras de cerâmica feldspática na cor A1 foram adquiridas, das quais 20 foram cortadas com uma espessura de 0,5mm e as restantes com 0,8mm. Com o intuito de simular a estrutura dentária subadjacente, foram confecionadas 40 amostras de resina composta na cor A2 e A3, 20 por cada cor. Todas as amostras foram polidas. Posteriormente, foram formados quatro grupos de estudo, emparelhando as
amostras de cerâmica com as de resina composta aleatoriamente, e, com recurso à glicerina, foi feita a sua união. A obtenção dos resultados do valor médio e desvio padrão de ΔE e das coordenadas (L*), (a*) e (b*) foram feitos com um espectrofotómetro.
Resultados: Relativamente aos resultados do valor médio de ΔE, o valor máximo obtido (21,69) corresponde à cerâmica de 0,8mm com a base A3 e o valor mínimo (15,53) à cerâmica de 0,5mm com a base A2. Existem diferenças estatisticamente significativas entre todos os grupos estudados em relação ao ΔE (p<0,05).
Conclusões: A cor da cerâmica feldspática é influenciada pela espessura da cerâmica e cor do substrato.
Objective: The aim of this study is to evaluate in vitro the color changes of feldspathic ceramics when different substrate shades are used and the thickness of the ceramic is varied. Materials and Methods: 40 A1 colored feldspathic ceramic specimens were acquired, of which 20 were cut at a thickness of 0.5 mm and the rest at 0.8 mm. In order to simulate the underlying tooth structure, 40 composite resin samples in A2 and A3 were made, 20 per color. All samples were polished. Subsequently, four study groups were formed by randomly pairing the ceramic and the composite resin samples, and using glycerin, they were bonded together. Obtaining the results of the mean value and standard deviation of ΔE and the coordinates (L*), (a*) and (b*) were done with a spectrophotometer. Results: Regarding the results of the mean value of ΔE, the maximum value obtained (21,69) corresponds to the 0.8 mm ceramic with A3 base and the minimum value (15,53) to the 0.5 mm ceramic with A2 base. There are statistically significant differences between all the groups studied regarding ΔE (p<0.05). Conclusions: The color of feldspathic ceramics is influenced by the thickness of the ceramic and color of the substrate. Conclusions: The color of feldspathic ceramics is influenced by the thickness of the ceramic and color of the substrate.
Objective: The aim of this study is to evaluate in vitro the color changes of feldspathic ceramics when different substrate shades are used and the thickness of the ceramic is varied. Materials and Methods: 40 A1 colored feldspathic ceramic specimens were acquired, of which 20 were cut at a thickness of 0.5 mm and the rest at 0.8 mm. In order to simulate the underlying tooth structure, 40 composite resin samples in A2 and A3 were made, 20 per color. All samples were polished. Subsequently, four study groups were formed by randomly pairing the ceramic and the composite resin samples, and using glycerin, they were bonded together. Obtaining the results of the mean value and standard deviation of ΔE and the coordinates (L*), (a*) and (b*) were done with a spectrophotometer. Results: Regarding the results of the mean value of ΔE, the maximum value obtained (21,69) corresponds to the 0.8 mm ceramic with A3 base and the minimum value (15,53) to the 0.5 mm ceramic with A2 base. There are statistically significant differences between all the groups studied regarding ΔE (p<0.05). Conclusions: The color of feldspathic ceramics is influenced by the thickness of the ceramic and color of the substrate. Conclusions: The color of feldspathic ceramics is influenced by the thickness of the ceramic and color of the substrate.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Cerâmica Cor Espectrofotómetro