Abstract
Objective: The purpose of this study was to analyze the effect of 2% chlorhexidine gluconate (CHX) on the degradation of composite resin–dentin bond strength when using self-etch adhesive systems.Methods: CHX (2%) was applied before application of two-step self-etch (TSC) and one-step self-etch (OSC) adhesive. Resin composite was applied incrementally. Specimens from the degradation treatment group were immersed in 10% NaOCl for 1 h. Shear bond strength was tested with a universal testing machine and analyzed using one-way ANOVA and Dunnett’s T3 post-hoc test. The composite resin–dentin bonds were observed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).Results: In the treatment group without 10% NaOCl, shear bond strength values were higher in the 2% CHX-treated group (TSC 11.67±1.76 MPa and OSC 10.19±1.44 MPa) than in the untreated group (TSC 10.93±1.31MPa and OSC 9.97±1.41 MPa), although this difference was not statistically significant. In samples exposed to10% NaOCl, shear bond strength values were higher in the 2% CHX-treated group (TSC 11.14±1.22 MPa and OSC 9.95±1.21 MPa) than in the untreated group (TSC 10.08±0.45 MPa and OSC 8.62±0.85 MPa), although this difference was not statistically significant. The SEM of samples from the 2% CHX-treated group showed less degradation than samples from the untreated group did.Conclusion: Application of 2% CHX may decrease the degradation of the resin composite-dentin bond.
Highlights
Composite resins are widely used for esthetic restoration [1]
(Clearfil SE) group and one-step self-etch (OSC) (Clearfil S3) group. This indicates that 2% chlorhexidine gluconate (CHX) application may increase the shear strength of the composite resin–dentin bond when using self-etch adhesive systems
Several studies conducted by Shafiei et al and Chaharom et al have shown a decrease in the shear strength of the composite resin–dentin bond after the application of CHX 2%, when using a self-etch adhesive system [14,22]
Summary
Composite resins are widely used for esthetic restoration [1]. composite resin restorations may fail in the long term, at the adhesive resin-dentin interface because of degradation processes that occur in the oral cavity [2,3]. The MMP enzyme is a proteolytic enzyme that can degrade collagen fibrils and extracellular matrices in demineralized dentin. This enzyme can be activated by the etching material used in total-etch or self-etch adhesive systems, and can decrease the stability of the collagen matrix. Bonding to dentin is currently achieved using total-etch and self-etch adhesive systems, which vary in the treatment of the smear layer [8,9]. Self-etch adhesive systems aim to preserve the smear layer for the resin monomer to diffuse to, and bond the resin monomer to the collagen in the dentin tubule to form a hybrid layer [9]. These two techniques differ in the composition and number of application steps [8]
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