Improving the effect of NaOCl pretreatment on bonding to caries-affected dentin using self-etch adhesives

Effect of smear layer treatment on dentin bond of self-adhesive cements

“…Several previous studies have demonstrated that NaOCl pretreatment on smear layercovered dentin had a negative effect on the bond strength of etch & rinse adhesive systems 22,23) and self-etching adhesive systems 14,24,25) . It has been speculated that remnants of super-oxide radicals generated by NaOCl within the dentin surface inhibit polymerization of resin monomers, resulting in siginificant reduction of bond strength 14,23,24) . This negative effect is dependent upon the application time of NaOCl.…”

“…There have been many studies on the pretreatment effect of NaOCl solution on bonding to smear layercovered dentin 11,12,14,[22][23][24][25] . Several previous studies have demonstrated that NaOCl pretreatment on smear layercovered dentin had a negative effect on the bond strength of etch & rinse adhesive systems 22,23) and self-etching adhesive systems 14,24,25) .…”

“…This negative effect is dependent upon the application time of NaOCl. It has been demonstrated that a 15 s or less application of NaOCl did not significantly affect the bond strength of self-etching adhesive systems to dentin 14,24) although pretreatment with NaOCl for 30 s or longer compromised the bonding of adhesive systems to dentin 24,25) . In this study, the NaOCl treatment time was for 5 or 15 s, however unfortunately, the bond strengths of SA and BR significantly decreased.…”

“…This conditioned smear layer with less organic components may enhance the bonding performance of self-etching adhesives because the disorganized collagen and the gelatinous layer within the smear layer may prevent resin monomer infiltration and prevent a perfect seal at the resin-dentin interface 10,13) . It was reported that NaOCl pretreatment also strengthened the bond of self-etching adhesive systems to caries-affected dentin covered with organic-rich smear layer 14) . Deproteinization of the smear layer might be more effective in enhancing the dentin bonding performance of self-adhesive cements than self-etching adhesives because self-adhesive cements are more viscous than self-etching adhesives.…”

The Effect of Er:YAG Laser Irradiation and Different Concentrations of Sodium Hypochlorite on Shear Bond Strength of Composite to Primary Teeth’s Dentin

“…Sodium hypochlorite is a non-specific proteolytic agent which can remove organic material, carbonate and magnesium ions and may change the composition of dentin. 14,15 Some studies have proposed this agent to be used after dentin etching, in order to affect the remaining collagen layer, thus increase the adhesion. [16][17][18] It seems that the efficacy of this method is related to the type of solvent solution contained in the bonding system.…”