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

Autor(es)

Calixto, L. R. ^[1] ; Bandeca, M. C. ^[1] ; Silva, F. B. ^[1] ; Rastelli, A. N. S. ^[1] ; Porto-Neto, S. T. ^[1] ; Andrade, M. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo State, Dept Restorat Dent, Araraquara Sch Dent, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Laser Physics; v. 19, n. 8, p. 1867-1871, AUG 2009.
• Citações Web of Science: 4

Resumo

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. (AU)

• Processo FAPESP: 07/06201-7 - Influência do sistema de cimentação adesiva e fonte de luz fotoativadora na resistência à extrusão de pinos de fibra de vidro
• Beneficiário: Luiz Rafael Calixto Lima
• Modalidade de apoio: Bolsas no Brasil - Mestrado