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Effect of cleaning protocols on bond strength of etch-and-rinse adhesive system to dentin

2018; Medknow; Volume: 21; Issue: 6 Linguagem: Inglês

10.4103/jcd.jcd_112_18

0974-5203

Milton Carlos Kuga, MarinaOliveira Goncalves Galoza, KerenCristina Fagundes Jordão-Basso, Wilfredo Gustavo Escalante‐Otárola, KeliRegina Victorino, Andréa Abi Rached Dantas,

Endodontics and Root Canal Treatments

Aim: This study aimed to evaluate the cleaning protocol of dentin impregnated with epoxy resin-based sealer (AH Plus) and the effects on the adhesive interface using 95% ethanol (E) or formamide solution (F) associated with microabrasion with glass microparticles (M). Methodology: Forty dentin specimens were impregnated with sealer (AH Plus). Specimens were cleansed according to the following protocols ( n = 10): G1 (E); G2 (F); G3 (E = M); and G4 (F = M). No treatment was performed in G5 (control). Specimens were subjected to standard error of the mean to evaluate the residues persistence (×500) and open dentinal tubules counting (×2000). Another fifty specimens were subjected to similar procedures and cleaning protocols. Seven days later, composite-resin-made specimens were performed on dentin using etch-and-rinse adhesive system, then submitted to microshear test. Results: G2 and G4 showed higher residues' persistence and lower incidence of open dentinal tubules than G1 and G3 ( P < 0.05). No difference was found between G1 and G3 or G2 and G4 ( P > 0.05). Adhesive system bond strength was similar in all groups ( P > 0.05). Conclusions: Microabrasion negatively affected the epoxy resin-based sealer residues' removal protocols' action; all groups presented residues on the dentin surface. However, 7 days later, the protocols did not affect the bond strength of adhesive system to sealer-impregnated dentin.