Effect of light-curing units on push-out fiber post bond strength in root canal dentin
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Data
2009-08-01
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Coorientador
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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.
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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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Inglês
Como citar
Laser Physics, v. 19, n. 8, p. 1867-1871, 2009.