Long-term bond strength of adhesive systems applied to etched and deproteinized dentin

Abstract

The aim of this study was to evaluate the early and 12-month bond strength of two adhesive systems (Single Bond-SB and One Step-OS) applied to demineralized dentin (WH) and demineralized/NaOCl-treated dentin (H). Twenty flat dentin surfaces were exposed, etched, rinsed and slightly dried. For the H groups, a solution of 10% NaOCl was applied for 60 s, rinsed (15 s) and slightly dried. The adhesives were applied according to the manufacturer's instructions and composite resin crowns were incrementally constructed. After 24 h (water-37°C), the specimens was sectioned in order to obtain resin-dentin sticks (0.8 mm2). The specimens were tested in microtensile (0.5 mm/min) immediately (IM) or after 12 months of water storage (12M). The data (MPa) were subjected to ANOVA and Tukey's test (α=0.05). Only the main factors adhesive and time were significant (p=0.004 and p=0.003, respectively). SB (42.3±9.1) showed higher bond strengths than OS (33.6±11.6). The mean bond strength for IM-group (42.5±8.7) was statistically superior to 12M (33.3±11.8). The use of 10% NaOCl, after acid etching, did not improve the immediate and the long-term resin-dentin bond strength.

In Vitro Study Compared The Shear Bond Strength of HEMA-free and HEMA-containing Bonding Agents To Different Dentin Surface Treatments

“…Also oxygen released by sodium hypochlorite molecules is another factor that might justify the decreased bond strength values, as it may inhibit adhesive polymerization and hence compromise the mechanical performance of the obtained bonding interfaces (23) . This is confirmed with the results obtained by Uceda-Gonez et al 2007 (24) , who concluded that: The use of 10% NaOCl for 1 min after dentin demineralization did not improved the bond strength to dentin either immediately or after a 1-year period.…”

Effect of chemical interaction on the bonding strengths of self-etching adhesives to deproteinised dentine

“…Deproteinisation of dentine by NaOCl is generally believed to exert negative effects on bond strength because of degradation of the organic matrix and destruction of the stereo structure of fibrillar collagen. 34,35 However, in the present study, the immediate bond strength between NaOCltreated dentine and self-etching adhesives with functional resin monomers (4-MET in G-Bond and 10-MDP in S3 Bond) did not decrease. The pH of the self-etching adhesives investigated was 1-3, which is acidic enough to etch dentine and enhance adhesive penetration into dentine micropores to increase micro-mechanical interlocking.…”

Effect of Dentin Biomodification Using Naturally Derived Collagen Cross-Linkers: One-Year Bond Strength Study

“…The total depth of dentin demineralization is not fully infiltrated by monomers, which leaves an exposed collagen network, susceptible to hydrolytic degradation over time [9]. The removal of dentin matrix, the so-called deproteinization, has already been proposed as a possible treatment to increase bond strength longevity and decrease technique sensitivity [7, 22]. However, a long-term study revealed decrease in the deproteinized dentin-resin bonds [22].…”

“…The removal of dentin matrix, the so-called deproteinization, has already been proposed as a possible treatment to increase bond strength longevity and decrease technique sensitivity [7, 22]. However, a long-term study revealed decrease in the deproteinized dentin-resin bonds [22]. In addition, the HL is believed to be important as a stress-buffering layer under mechanical loading [7].…”