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. 2018 Nov-Dec;21(6):602-606.
doi: 10.4103/JCD.JCD_112_18.

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

Marina Oliveira Gonçalves Galoza  1 , Keren Cristina Fagundes Jordão-Basso  1 , Wilfredo Gustavo Escalante-Otárola  1 , Keli Regina Victorino  1 , Andrea Abi Rached Dantas  1 , Milton Carlos Kuga  1
Affiliations

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

Marina Oliveira Gonçalves Galoza et al. J Conserv Dent. 2018 Nov-Dec.

Abstract

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.

Keywords: Adhesion; debris; obturation material; scanning electron microscopy.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Representative image of residues persistence (×500) according to the groups: G1 (a), G2 (b), G3 (c), G4 (d), and G5 (e). Image representative of open dentinal tubules incidence (×1000) according to the groups: G1 (f), G2 (g), G3 (h), G4 (i), and G5 (j). G1, 95% ethanol; G2, 95% ethanol and microabrasion with glass microparticles; G3, formamide solution; G4, formamide solution and microabrasion with glass microparticles; and G5, control, untreated. Vmx: maximum value and Vmin: minimum value
Figure 2
Figure 2
Failure mode incidence according to the groups. G1, 95% Ethanol; G2, 95% ethanol and microabrasion with glass microparticles; G3, formamide solution; G4, formamide solution and microabrasion with glass microparticles; and G5, control, untreated. Red: adhesive failure, yellow: mixed failure, and blue: cohesive failure
See this image and copyright information in PMC

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