Efeito da intensidade de fontes de luz e barreiras de cerâmica na microdureza de cimento resinoso dual
Effect of intensity of light sources and barriers in ceramic hardness of dual-cured cement
Fonseca, Gabriela Santos; Correia, Ayla Macyelle de Oliveira; Griza, Sandro; Villarroel, Milko; Takeshita, Wilton Mitsunari; Mendonça, Adriano Augusto Melo de
Resumo
Introdução: O cimento resinoso dual é o principal material para cimentação de cerâmicas. Contudo, fatores, como fonte de luz, podem influenciar no desempenho do cimento. Objetivo: Avaliar a influência de duas fontes de luz de diferentes intensidades sobre a microdureza de um cimento resinoso quando fotoativado sob diferentes cerâmicas. Material e método: Foram fotoativados 40 espécimes de cimento resinoso dual (10 mm × 1,0 mm) por meio de duas fontes de luz LED, com intensidades de 1.000 mW/cm² e 800 mW/cm² durante 40 segundos, sob cerâmicas (15 mm × 2 mm) à base de zircônia, espinélio MgAl2O4 e dissilicato de lítio. No grupo controle, foi utilizada uma placa de vidro de mesma dimensão. As amostras tiveram a superfície regularizada com lixa d`água (600 e 1200). Após armazenagem a seco no escuro (24 h), foram realizadas as medidas de microdureza Vickers (HMV Shimadzu - 50g/10 segundos). Os dados foram submetidos à Anova fatorial e ao teste de Tukey com nível de significância de 5%. Resultado: O cimento polimerizado apresentou valor médio de microdureza e desvio padrão para o grupo controle de 43,9±1,5 e 43,4±1,3, para as intensidades de 1.000 mW/cm2 e 800 mW/cm2, respectivamente. O menor valor de microdureza do cimento foi observado para a cerâmica à base de espinélio MgAl2O4, polimerizado a 800 mW/cm², com valor de 34,3±3,3. Conclusão: O tipo de cerâmica e a intensidade da fonte de luz influenciam na microdureza do cimento. A intensidade de 1.000 mW/cm2 sobre as cerâmicas à base de zircônia e espinélio MgAl2O4 resultaram na melhor combinação de valores de dureza do cimento.
Palavras-chave
Abstract
Introduction: The dual-cure resin cement is the main material for luting of ceramic. However, factors such as light source can influence the performance of the cement. Objective: Evaluate the influence of two light sources of different intensities on the microhardness of a resin cement when cured under different ceramics. Material and method: Forty samples of dual resin cement were photoactivated by two LED light sources, with light intensity of 1000mW/cm² and 800mW/cm², respectively (40 seconds), under the base ceramic Zirconia, Spinel MgAl2O4 and Lithium Disilicate. In the control group, a glass plate was used. Each samples had the surface grounded (600 and 1200). After dry storage in the dark (24 hours), Vickers microhardness measurements were performed (HMV Shimadzu - 50gf/10 seconds). The data were submitted to factorial ANOVA and Tukey's test with significance level of 5%. Result: The average hardness and standard deviation in the control group for cement polymerized 1000mW/cm² was 43.9±1.5 and 800mW/cm² the value of 43.4±1.3. The lowest value was for the Ceramic base of spinel MgAl2O4, light cured with 800mW/cm² with a value of 34.3±3.3. Conclusion: The ceramic type and intensity of the light source influence the hardness of the cement. The polymerization 1000mW/cm2 on the ceramic based on zirconia and spinel MgAl2O4 resulted in the best combination of hardness cement.
Keywords
References
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