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


Autoria(s): CALIXTO, L. R.; BANDECA, M. C.; SILVA, F. B.; RASTELLI, A. N. S.; PORTO-NETO, S. T.; ANDRADE, M. F.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2009

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.

FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, SP/Brazil)[07/06201-7]

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Identificador

LASER PHYSICS, v.19, n.8, p.1867-1871, 2009

1054-660X

http://producao.usp.br/handle/BDPI/30185

10.1134/S1054660X09150067

http://dx.doi.org/10.1134/S1054660X09150067

Idioma(s)

eng

Publicador

MAIK NAUKA/INTERPERIODICA/SPRINGER

Relação

Laser Physics

Direitos

restrictedAccess

Copyright MAIK NAUKA/INTERPERIODICA/SPRINGER

Palavras-Chave #CURED RESIN CEMENT #ER-YAG LASER #ENDODONTICALLY TREATED TEETH #LUTING CEMENTS #INTRARADICULAR DENTIN #TEMPERATURE RISE #SURFACE HARDNESS #KNOOP-HARDNESS #SEM EVALUATION #COMPOSITE #Optics #Physics, Applied
Tipo

article

original article

publishedVersion