The Effect of Oxalate Desensitizers on the Microleakage of Resin Composite Restorations Bonded by Etch and Rinse Adhesive Systems

Abstract

©Operative Dentistry, 2010, 35-6, 682-688 F Shafiei • M Motamedi AA Alavi • B Namvar Clinical RelevanceThe effect of oxalate desensitizer application after acid etching on the dentinal marginal sealing ability of resin composite restorations may be adhesive-specific. SUMMARYThis in vitro study evaluated the effect of an oxalate desensitizer (OX) on the marginal microleakage of resin composite restorations bonded by two three-step and two two-step etch and rinse adhesives. Class V cavities were prepared on the buccal surfaces of 126 extracted premolars at the cementoenamel junction and randomly divided into nine groups of 14 each. In the control groups (1-4), four adhesives were applied, respectively, including Adper Scotchbond Multi-Purpose (SBMP), Optibond FL (OBFL), One-Step Plus (OS) and Excite (EX). In the experimental groups (5-8), the same adhesives, in combination with OX (BisBlock), were applied. And, in one group, OX was applied without any adhesive, as the negative control group (9). All the groups were restored with a resin composite.After 24 hours of storage in distilled water and thermocycling, the samples were placed in 1% methylene blue dye solution. The dye penetration was evaluated using a stereomicroscope. The data were analyzed using non-parametric

Four-year randomized clinical trial of oxalic acid pretreatment in restorations of non-carious cervical lesions

“…After 2 years, they also showed that the potassium oxalate may adversely affect the baseline hardness of etch-and-rinse adhesives [34]. Therefore, in accordance with these previous studies [21,[29][30][31][32][33][34], it can speculate that crystal precipitation on the etched dentin surface impaired the adequate hybrid layer formation.…”

“…The coverage of the dentin surface with an acid-resistant layer of oxalate crystals may interfere with the formation of a sufficient hybrid layer, decreasing the bond strength to dentin [30]. In addition, they also believe that although the oxalate solution has been thoroughly rinsed before the adhesives' application, residual oxalic acid may have remained and reacted with calcium, causing crystal precipitation on the dentin surface, which, in turn, could disturb polymerization of the adhesives and, ultimately, compromise their bonding performance [30,31].…”

Effect of desensitizers on the microleakage of previously restored Class V resin composite restorations

“…[29][30][31] Shafie et al [32] reported that oxalate desensitizer adversely influenced the marginal sealing ability of composite restorations. In the light of the obtained results, BisBlock desensitizer has no positive effect on the marginal microleakage in the present study.…”

The Effect of the Application Sequence of Casein Phosphopeptide‐Amorphous Calcium Phosphate Paste on the Shear Bond Strength of Etch‐and‐Rinse Resin Cements to Dentin

“…The presence of mineral deposits at the base of the exposed collagen matrix might fill the resin‐free gaps of the hybrid layer that might decrease the permeability and enhance the polymerization of resin cements. Lowering the risk of nanoleakage and improving the bond durability might be expected …”

“…On the other hand, CPP‐ACP application in combination with OS/Duolink showed compromised results. The OS adhesive is less acidic (pH = 4.61) than Ex DSC and contains fluoride (806 ppm) . The formation of calcium fluoride (CaF 2 ) spherical globules following interaction of the free fluoride ions in the OS adhesive and available calcium and phosphate ions on the dentin surfaces after CPP‐ACP treatment plus the limited dissolving capacity of OS adhesive because of low acidity might interfere with resin infiltration and decrease the SBS of OS/Duolink.…”