Shear Bond Strength Evaluation of Resin Composite Bonded to GIC Using Three Different Adhesives

Abstract

SUMMARYThe current study evaluated the bonding ability of composite to glass ionomer cement (GIC) using three different bonding systems. One hundred samples of composites bonded to GIC were prepared and divided into five groups. In Group A, the composite was bonded to GIC after the initial setting of the GIC being employed as a total-etch adhesive. In Group B, the self-etch primer was employed to bond composite to GIC before the initial setting of the GIC. In Group C, the self-etch primer was employed to bond composite to the GIC after the initial setting of the GIC. In Group D, the GIC-based adhesive was employed to bond composite to the GIC before the initial setting of the GIC. In Group E, the GIC-based adhesive was employed to bond composite to the GIC after the initial setting of the GIC. Shear bond strength analysis was performed at a crosshead speed of 0.5 mm/minute. The results were tabulated and the statistical analysis was performed with one-way ANOVA; the Tukey's test showed that the bond strength of composite to GIC was significantly higher for the self-etch primer group employed on unset GIC and the GIC-based adhesive group employed on the set GIC for bonding composite to GIC. V Gopikrishna • M Abarajithan Clinical RelevanceThe bond strength of resin composite to glass-ionomer cement can be enhanced when a selfetching primer is employed over unset GIC or when a glass-ionomer based adhesive is employed over set GIC when compared to using a total-etch adhesive.

Shear Bond Strength Evaluation of Resin Composite Bonded to GIC Using Different Adhesives

“…Zhang and others observed that total-etch adhesive has a lower bond strength than the self-etch adhesives when bonded to conventional GIC [20]. Gopikrishna and others showed that the bond strength of composite to GIC was significantly higher for the self-etch primer group employed on unset GIC [13]. But they observed superior performance of GIC based adhesive over set GIC which could be attributed to chemical bonding between the composites and resin modified glass-ionomers, which has been proven by previous reports [21].…”

“…Studies have proven that self-etch systems produce bondstrength similar to total-etch systems to both dentin and enamel [11,12]. The other advantage of these systems is their feasibility to be employed over unset GIC, as there is no need to rinse the GIC prior to application of the bonding agent, thus preventing moisture contamination or desiccation of the underlying GIC and saving precious chairside clinical time [13].…”

Influence of surface treatment of glass-ionomers on surface free energy and bond strength of resin composite

“…It has been reported that the oxygen-inhibited layer is always produced when resin based material is polymerized in air 25) . The residual unreacted methacrylate groups on the polyacid chain within the oxygen-inhibited layer has been suggested to form strong chemical bonds with the resin composite 26,27) . Acid etching or air-abrasion of RMGIC can result in lower shear bond strength as these surface treatments may partially or completely remove methacrylate groups in the availability of the oxygen-inhibited layer, which contributes to copolymerization with resin composite.…”

Bond strength of a composite resin to glass ionomer cements using different adhesive systems

“…However, the lack of chemical bonding between composite resin and conventional GICs may interfere in the final properties of the restoration, and consequently, its longevity 6 . To improve the GIC/composite resin bond, the use of resin-modified glass ionomer cements may be indicated 3,7 .…”

“…Nonetheless, moisture contamination during setting of the GICs may cause dissolution of the calcium polyacrylate chains altering their physical properties 9 , therefore it is advisable to wait for the initial setting to occur before carrying out the acid etching and washing 6,10 .…”