Microtensile bond strength of silorane-based resin composite and its coresponding adhesive in class I restoration

Abstract

To investigate microtensile bond strength (µTBS) of silorane-based resin composite (Filtek P90®/ Silorane system adhesive®) compared to methacrylate-based resin composite (Filtek Z250®/ Scotchbond Multipurpose®), and to determine the effect of c-factor and water storage time on µTBS in class I cavity. Extracted human third molars were ground flat to expose dentin, and randomly divided into 8 groups according to the type of resin composite, c-factor and water storage time, group 1 Filtek P90®/high c-factor/24 hours (PHC24h), group 2 Filtek P90®/low c-factor/24 hours (PLC24h), group 3 Filtek Z250®/high c-factor/24 hours (ZHC24h), group 4 Filtek Z250®/low c-factor/24 hours (ZLC24h), group 5 Filtek P90®/high c-factor/3 months (PHC3m), group 6 Filtek P90®/low c-factor/3 months (PLC3m), group 7 Filtek Z250®/high c-factor/3 months (ZHC3m), and group 8 Filtek Z250®/low c-factor/3 months (ZLC3m). After 24 hours and 3 months of water storage, bonded hourglass specimen were tested for µTBS using 1 mm/min cross-head speed and failure types were also determined. Data were analyzed using three-way ANOVA and Tamhane post-hoc test (α = 0.05). Significant influence of the type of resin composite, c-factor and water storage time were observed. ZLC24h exhibited the highest µTBS (54.19 ± 9.05 MPa), and PHC3m the lowest (6.94 ± 2.07 MPa). All groups showed significant decrease in µTBS when used in high c-factor and 3 month water storage time, except when compared between PHC24h and PHC3m.