Degree of conversion and microhardness of resin cements photoactivated through glass ceramic
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Carolina-Nemesio-de Barros Pereira [1] ; Cláudia-Silami Magalhães [1] ; Frederico-Santos Lages [1] ; Raquel-da Conceição Ferreira [1] ; Emerson-Hamilton da Silva [2] ; Rodrigo-Richard da Silveira [1] ; Elaine-Carballo-Siqueira Corrêa [3] ; Cristiano-Leite Fantini [1] ; Allyson-Nogueira Moreira [1]
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[1] Universidade Federal de Minas Gerais
Universidade Federal de Minas Gerais
Brasil
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[2] PhD, Private office
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[3] PhD, Professor, Department of Metalography, Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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- Localización: Journal of Clinical and Experimental Dentistry, ISSN-e 1989-5488, Vol. 13, Nº. 11 (November), 2021, págs. 1068-1075
- Idioma: inglés
- Enlaces
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Resumen
To assess whether glass-ceramic shade, thickness and translucency affect degree of conversion (DC) and Knoop microhardness (KHN) of resin cements photoactivated using light-emitting diode (LED) or quartz-tungsten-halogen (QTH) units.
Glass-ceramic blocks were cut (2, 3 and 4mm) and sintered. For DC FT Raman spectroscopy (n=3), film specimens of cements (RelyX ARC, U200, Veneer, C&B) were obtained. For KHN test (n=3), cements were inserted in cylindrical matrix and covered by polyester strip. Specimens were photoactivated (30s) using LED or QTH according to each group: direct photoactivation (DP), interposing ceramic specimens or no photoactivation (NP). Data were analysed by ANOVA and Tukey’s test, Kruskal-Wallis and Dunn’s tests (p<0.05).
Ceramic features had significant effect on DC of RelyX ARC, U200 and Veneer (p<0.0017). Light source had no effect (p=0.9512). C&B and Veneer had higher DC, followed by dual cements. NP dual cements showed the lowest DC. For KHN, ceramic shade (p=0.1717) and light source (p=0.1421) were not significant, but ceramic translucency, thickness and resin cement were significant (p=0.0001). KHN was higher for U200 followed by ARC, and lowest for Veneer.
DC was affected by ceramic shade, translucency and thickness. KHN was dependent on ceramic translucency and thickness. Higher DC and KHN were achieved for dual-cured cements photoactivated through 2mm-thick low translucent or 3mm-thick high translucent glass-ceramic.
