Shear bond strength of composite to demineralized enamel conditioned with resin infiltration

Aim: The aim of this in vitro study was to evaluate the influence of resin infiltration on bond-strength of composite resin to demineralized enamel. Methodology: Thirty bovine incisors were used in this study. Buccal enamel surfaces of bovine incisors were wet polished and then were divided into three groups: sound enamel; demineralized enamel; demineralized enamel infiltrated with a low-viscosity resin (ICON, DMG, Hamburg, Germany). After acid-etching with 37% phosphoric acid for 20 seconds, a two-step, total-etch adhesive (Single Bond 2, 3M ESPE, St. Paul, MN, USA) was applied using a microbrush for 20 seconds, followed by gentle air-drying for 5 seconds. The adhesive was light-cured for 10 seconds. Following the adhesive application, flowable composite resin (Filtek Supreme Flowable, 3M ESPE, St. Paul, MN, USA) was gently placed into a microtubule and was photopolymerized using an LED curing unit (Elipar Deep Cure; 3M ESPE, St. Paul, MN, USA). The microshear bond strength (µSBS) tests were performed using a microshear testing machine at a cross-head speed of 0.5 mm/min. One-way ANOVA and Bonferroni tests were used to analyze the data (5%). Results: Significant differences were found according to the ANOVA (p < 0.05). Pair-wise comparison results of µSBS (mean ± SD) were: sound enamel (25.16 ± 2.3); demineralized enamel (17.93 ± 2.1); demineralized enamel infiltrated with a low-viscosity resin (28.51 ± 3.76). Conclusion: Resin infiltration applied to demineralized enamel before composite application increased the bond strength. No difference was found in the bond strength values obtained for sound enamel and resin infiltrated enamel.   How to cite this article: Durukan SM, Gümüştaş B, Şişmanoğlu S. Shear bond strength of composite to demineralized enamel conditioned with resin infiltration. Int Dent Res 2022;12(Suppl.1):114-19. https://doi.org/10.5577/intdentres.441   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.