Effect of light-curing units on push-out fiber post bond strength in root canal dentin

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The purpose of this study was to evaluate the effectiveness of different light-curing units on the bond strength (push-out) of glass fiber posts in the different thirds of the root (cervical, middle and apical) with different adhesive luting resin systems (dual-cure total-etch; dual-cured and self-etch bonding system; and dual-cure self-adhesive cements), Disks of the samples (n = 144) were used, with approximately 1 mm of thickness of 48 bovine roots restored with glass fiber posts, that were luted with resin cements photo-activated by halogen LCU (QTH, Optilux 501) and blue LED (Ultraled), with power densities of 600 and 550 mW/cm 2, respectively. A universal testing machine (MTS 810 Material Test System) was used with a 1 mm diameter steel rod at cross-head speed of 0.5 mm/min until post extrusion, with load cell of 50 kg, for evaluation of the push-out strength in the different thirds of each sample. The push-out strength values in kgf were converted to MPa and analyzed through Analysis of Variance and Tukey's test, at significance level of 5%. The results showed that there were no statistical differences between the QTH and LED LCUs. The self-adhesive resin cement had lower values of retention. The total-etch and self-adhesive system resin cements seem to be a possible alternative for glass fiber posts cementation into the radicular canal and the LED LCU can be applied as an alternative to halogen light on photo-activation of dual-cured resin cements. © 2009 Pleiades Publishing, Ltd.



Blue LEDs, Bond strength, Bonding systems, Crosshead speed, Dual-cure, Fiber posts, Light-curing units, Load cells, Luting resins, Material test system, Photo-activated, Power densities, Push-out, Resin cement, Root canals, Self-adhesive, Self-etch, Statistical differences, Steel rod, Strength values, Universal testing machines, Bond strength (materials), Cell membranes, Cements, Curing, Fibers, Glass fibers, Hydraulic structures, Light transmission, Load testing, Regression analysis, Resins, Steel testing, Glass bonding

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Laser Physics, v. 19, n. 8, p. 1867-1871, 2009.