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Translucidez de diferentes zircónias
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Abstract(s)
Objetivo: O objetivo deste estudo foi comparar a translucidez de diferentes tipos e espessuras de zircónia.
Materiais e métodos: Foram fresados 20 espécimes de zircónia monolítica UT (Bloomden W00098014UT) e 20 espécimes de zircónia multilayer ST (Bloomden W00098016ST- ML-A2), pré-sinterizados, através do sistema CAD/CAM. Definiram-se 4 grupos segundo a espessura (0.5, 1.0, 1.5, 2.0 mm) tanto no grupo da zircónia monolítica como no grupo da zircónia multilayer, n=5. Os espécimes de zircónia monolítica foram submersos no corante (BloomZir® UT Coping Crown A2) durante 2 minutos, segundo as indicações do fabricante. Posteriormente, todos os espécimes foram sinterizados no forno (IMES-Wieland Zeno® Fire). Por fim, todos os espécimes foram submetidos a um banho de ultrassons. Os valores de L*, a* e b* foram medidos através do espectrofotómetro SpectroShade Micro em 6 localizações diferentes. A translucidez dos espécimes foi calculada através de duas fórmulas distintas: a relação de contraste (CR =𝐿𝑏𝐿𝑤) e o parâmetro de translucidez (TP=[(𝐿𝑏−𝐿𝑤)2+(𝑎𝑏−𝑎𝑤)2+(𝑏𝑏−𝑏𝑤)2]12⁄). Todos os dados foram analisados estatisticamente.
Resultados: Os valores de TP variaram entre 14,092 a 26,666 na zircónia UT monolítica e 9,997 a 18,624 na zircónia ST multilayer. Com o aumento da espessura verificou-se um decréscimo no TP em ambos os materiais. Os valores de CR variaram entre 0,718 a 0,862 na zircónia UT monolítica e 0,804 a 0,905 na zircónia ST multilayer. Com o aumento da espessura verificou-se um aumento no CR em ambos os materiais. Verificaram-se diferenças estatisticamente significativas na translucidez entre os materiais (p<0.001), entre as diferentes espessuras (p<0.001) e entre a interação da espessura com o material (p<0.001).
Conclusões: A zircónia UT monolítica demonstrou-se mais translúcida do que a zircónia ST multilayer. A translucidez foi afetada tanto pelo tipo de material como pela espessura. Quanto maior a espessura do material menor a translucidez.
Objective: The aim of this study was to compare the translucency of different types and thicknesses of zirconia. Materials and methods: 20 specimens of pre-sintered UT monolithic zirconia (Bloomden W00098014UT) and 20 specimens of pre-sintered ST multilayer zirconia (Bloomden W00098016ST- ML-A2) were cut through the CAD/CAM system. Four groups were defined according to thickness (0.5, 1.0, 1.5, 2.0 mm) in both monolithic and multilayer zirconia (n=5). The monolithic zirconia specimens were colored with coloring liquid (BloomZir® UT Coping Crown A2) for 2 minutes, according to the manufacturer’s instructions. Subsequently, all zirconia specimens were sintered in the furnace (IMES-Wieland Zeno® Fire). Finally, all specimens were cleaned in an ultrasonic bath. The values of L*, a* and b* were measured using the spectrophotometer SpectroShade Micro at 6 different locations. The translucency of the specimens was calculated using two different formulas: the contrast ratio (CR =𝐿𝑏𝐿𝑤) and the translucency parameter (TP=[(𝐿𝑏−𝐿𝑤)2+(𝑎𝑏−𝑎𝑤)2+(𝑏𝑏−𝑏𝑤)2]12⁄). All data was analyzed statistically. Results: TP values ranged from 14.092 to 26.666 in UT monolithic zirconia and 9.997 to 18.624 in ST multilayer zirconia. With the increase of thickness there was a decrease in TP in both materials. CR values ranged from 0.718 to 0.862 in UT monolithic zirconia and 0.804 to 0.905 in the ST multilayer zirconia. The increase in thickness showed an increase in CR in both materials. There were statistically significant differences in the translucency between the material (p<0.001), the different thicknesses (p<0.001) and between the interaction of thickness and material (p<0.001). Conclusions: UT monolithic zirconia was more translucent than the ST multilayer zirconia. The translucency was affected by both the type of material and thickness. The greater the thickness of the material the lower the translucency.
Objective: The aim of this study was to compare the translucency of different types and thicknesses of zirconia. Materials and methods: 20 specimens of pre-sintered UT monolithic zirconia (Bloomden W00098014UT) and 20 specimens of pre-sintered ST multilayer zirconia (Bloomden W00098016ST- ML-A2) were cut through the CAD/CAM system. Four groups were defined according to thickness (0.5, 1.0, 1.5, 2.0 mm) in both monolithic and multilayer zirconia (n=5). The monolithic zirconia specimens were colored with coloring liquid (BloomZir® UT Coping Crown A2) for 2 minutes, according to the manufacturer’s instructions. Subsequently, all zirconia specimens were sintered in the furnace (IMES-Wieland Zeno® Fire). Finally, all specimens were cleaned in an ultrasonic bath. The values of L*, a* and b* were measured using the spectrophotometer SpectroShade Micro at 6 different locations. The translucency of the specimens was calculated using two different formulas: the contrast ratio (CR =𝐿𝑏𝐿𝑤) and the translucency parameter (TP=[(𝐿𝑏−𝐿𝑤)2+(𝑎𝑏−𝑎𝑤)2+(𝑏𝑏−𝑏𝑤)2]12⁄). All data was analyzed statistically. Results: TP values ranged from 14.092 to 26.666 in UT monolithic zirconia and 9.997 to 18.624 in ST multilayer zirconia. With the increase of thickness there was a decrease in TP in both materials. CR values ranged from 0.718 to 0.862 in UT monolithic zirconia and 0.804 to 0.905 in the ST multilayer zirconia. The increase in thickness showed an increase in CR in both materials. There were statistically significant differences in the translucency between the material (p<0.001), the different thicknesses (p<0.001) and between the interaction of thickness and material (p<0.001). Conclusions: UT monolithic zirconia was more translucent than the ST multilayer zirconia. The translucency was affected by both the type of material and thickness. The greater the thickness of the material the lower the translucency.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Translucidez Zircónia Monolítica Multilayer