Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)This study evaluated the effect of mechanical properties of resin-based luting agents on the strength of resin-coated porcelain. The luting agents tested were two flowable resin composites (Filtek Z350 Flow and Tetric-N Flow), a light-cured resin cement (Variolink Veneer [VV]), and a dual-cured resin cement (Variolink II) in either light-cured (base paste) or dualcured (base + catalyst pastes [VD]) mode. Flexural strength (sigma(f)) and modulus of elasticity (E-f) of the luting agents were measured in three-point bending mode (n=5). Porcelain discs (Vita VM7) were tested either untreated (control) or acid etched, silanized, and coated with the luting agents. Biaxial flexural strength (sigma(bf)) of the porcelain discs was tested using a ball-onring setup (n=30). The sigma(bf) of the resin-coated specimens was calculated at z-axial positions for multilayer specimens in the ball-on-ring test: position z = 0 (ceramic surface at the bonded interface) and position z = -t(2) (luting agent surface above ring). The sigma(f) and E-f data were subjected to analysis of variance and the Student-Newman-Keuls test (alpha=0.05). A Weibull analysis was performed for sigma(bf) data. Weibull modulus (m) and characteristic strength (sigma(0)) were calculated. Linear regression analyses investigated the relationship between mechanical properties of the luting agents and the strengthening of porcelain. VD had higher and VV had lower mechanical strength than the other materials. At z = 0, all resin-coated groups had higher sigma(bf) than the control group. No significant differences between the luting agents were observed for sigma(bf) and sigma(0). At z = -t(2), VD had the highest sigma(bf) and sigma(0), whereas VV had the poorest results. No significant differences in m were observed across groups. A linear increase in flexural strength of the porcelain was associated with increased sigma(f) and E-f of the luting agents at position z = -t(2). In conclusion, resin coating and use of luting agents with better physical properties generally improved the mechanical performance of porcelain.41 179188FAPERGS/Brazil [0902063]CNPq/Brazil [503897/2012-4]Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)