Produção Nacional
Revisado por pares
Comparison of silorane and methacrylate-based composite resins on the curing light transmission
2010; Fundação Odontológica de Ribeirão Preto; Volume: 21; Issue: 6 Linguagem: Inglês
10.1590/s0103-64402010000600010
ISSN1806-4760
AutoresRicardo Danil Guiraldo, Símonídes Consani, Rafael Leonardo Xediek Consani, Sandrine Bittencourt Berger, Wilson Batista Mendes, Mário Alexandre Coelho Sinhoreti, Lourenço Correr‐Sobrinho,
Tópico(s)Laser Applications in Dentistry and Medicine
ResumoThe aim of this study was to investigate the influence of different composite resins - Filtek P90 (silorane-based composite) and Heliomolar (methacrylate-based composite) - on light transmission and decrease in Knoop hardness between the bottom and top of cured specimens. The irradiance of a light-curing unit (LCU) was measured with a power meter (Ophir Optronics; 900 mw/cm2) and spectral distributions were obtained using a spectrometer (USB 2000). Twenty standardized cylindrical specimens (2 mm thick x 7 mm diameter) of each composite resin were obtained by curing using the LCU for 40 s. Light energy transmission through the composite was calculated (n=10). The Knoop hardness number for each surface was recorded as the mean of 3 indentations. The difference in Knoop hardness between the top and bottom (DKH) of the same specimen was calculated (n=10). The irradiance of light that passed through Filtek P90 (272 mW/cm2) was not significantly greater than that the passed through Heliomolar (271 mW/cm2). The DKH of Filtek P90 (25%) was significantly higher than that of Heliomolar (12%). There was a greater degree of subsurface polymerization of the methacrylate-based composite compared to the silorane-based composite.
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