Influence of ascorbic acid on bonding of peroxide-affected dentin and 4-META/MMA-TBB resin

Abstract

The purpose of this study was to evaluate the tensile bond strength to peroxide-exposed dentin. Furthermore, the effect of ascorbic acid on the bond strength of peroxide-exposed dentin was investigated. Extracted bovine dentin was exposed to 10% carbamide peroxide, 30% hydrogen peroxide or distilled water for 30 min, then treated with 10% ascorbic acid (0,30, 90, 180 min), and conditioned with 10% citric acid/3% ferric chloride. The PMMA rod was bonded to the treated bovine dentin with 4-META/MMA-TBB resin. A mini-dumbbell-shaped bonded specimen was prepared from these bonded assemblies and the tensile bond strength was tested. The fractured surfaces were also observed with SEM. Exposure to peroxide before bonding significantly reduced bond strength. The application of ascorbic acid to the peroxide-exposed dentin increased bond strength. On the other hand, an adverse effect of ascorbic acid was found in distilled water-affected dentin.Extended resin fibers were partially seen in the peroxide-exposed dentin. In conclusion, peroxide reduced the bond strength, and the stronger the oxidation, the weaker the obtained bond. Anti-oxidation with ascorbic acid recovered the bond strength, and the effect increased the longer the ascorbic acid was applied.

Review of methyl methacrylate (MMA)/tributylborane (TBB)-initiated resin adhesive to dentin

“…This meant that the chemical reaction between sodium hypochlorite and ferric ion could have inhibited the ability of ferric ions to effect interfacial initiation of polymerization. Similarly, exposure of dentin to oxidants like hydrogen peroxide and carbamide peroxide before bonding decreased the bond strength of 10-3/4-META/MMA-TBB system 79) . In other words, reductants could reverse the undesirable effect of oxidants, like hypochlorite, on dentin bonding.…”

“…In other words, reductants could reverse the undesirable effect of oxidants, like hypochlorite, on dentin bonding. Reductants such as ascorbic acid and sodium thiosulfate were reportedly effective [79][80][81] . In commercial 10-3/4-META/MMA-TBB sealer for root canal filling (SuperBond Sealer Accel, Sun Medical Co. Ltd., Moriyama, Japan), aromatic sulfinic salt is used as a reductant.…”

Effect of application time of colloidal platinum nanoparticles on the microtensile bond strength to dentin

“…On resin tag formation, the resin tags observed for CPN application groups (B) and (C) seemed to be longer and penetrate deeper into the dentinal tubules 29) than the control. Apart from hybrid layer thickness, resin tag length and density are also important factors that affect the quality of the bond 30,31) .…”

Effects of calcium hydroxide reagent on the bond strength of resin cements to root dentin and the retention force of FRC posts

“…Root dentin has lower potential for bonding with less exposure of dentinal tubules compared to coronal dentin 27) ; reagents used during root canal treatment can affect bond strength even more 13,22) . In this study, we investigated the effects of calcium hydroxide on the bond strength of root dentin by bonding to resin composite, a core build-up material, with adhesive resin cement.…”

“…For example, sodium hypochlorite and hydrogen peroxide, used for root canal irrigation, are known to decrease bond strength of adhesive resin cements 12,13) . Calcium hydroxide reagents, which have been shown to be challenging to completely remove from root canals, are also commonly used on root canals as antibacterial medication [14][15][16][17] .…”