The aim of this study was to investigate the effects of pretreatment of different irrigating solutions with and without the application the Nd: YAG laser on the bond strength (RU) of the adhesion of the fiberglass post relined with resin composite to the root dentin.

Sixty-six single bovine incisor roots were divided into 6 groups according to irrigating solution and with/without the apllication of the Nd: YAG laser after root canal filling: S- saline; C-2% chlorhexidine solution, H-2.5% sodium hypochlorite; SL-saline + laser, CL-2% chlorhexidine + laser; HL-2.5% sodium hypochlorite + laser (all n = 11). The roots were standardized up to a file # 80 and root-filled with gutta-percha (Dentsply) and Sealer 26 (Dentsply) by lateral condensation. The root canal filling was partly removed. Afterward, root canals were irrigated with 5 ml of the selected irrigant and the fiberglass post were cemented with epoxy resin curing dual Bifix QM (VOCO) and a self-etch adhesive system Futurabond DC (VOCO). All roots were sectioned transversely, and the push-out tested was performed. The bond strength means were analyzed by the analysis of variance and Tukey test (α= 5%).

The following bond strength MPa values—were recorded for each group: group C—7.77(±1.8)^a, LC—6.46 (±2.2)^a, S7.33 (±2.2)^a, LS 7.35 (±1.68)^a, H 5.43 (±1,3)^b, LH 5.13 (±1,6)^b. A signifcant bond strenght decrease was noticed with the use of 2.5% NaOCl (p < 0.05). No statistical significant difference were found with our without the apllication of the Nd:YAG laser (p > 0.05).

Regardless the irrigant tested, the use of Nd: YAG laser can be indicated prior to cementation of fiberglass without loss in bond strength.

Pucci CR, Lacerda AJF, Gullo M, Xavier ACC, Torres CRG, Martinho FC, Carvalho CAT. Evaluation of the Influence of the Nd:YAG Laser and Different Irrigants on the Bond Strength of the Adhesion of the Fiber Posts to Root Dentin using a Self-etching Adhesive System. World J Dent 2013;4(3):170-174.