Evaluation of Microtensile Bond Strength to Dentin of a Self-adhesive Bulk-fill Resin Composite Restorative Material after Aging (In Vitro Study)
Year: 2025
Type: article
Abstract: Aim and background: Self-adhesive composites were introduced to enhance clinical and mechanical characteristics of composite restorations as they contain self-etching monomers allowing their application to tooth without additional treatment.Aim: To evaluate microtensile bond strength of Surefil one self-adhesive composite with and without adhesive application and Filtek One bulkfill composite after different aging periods. Materials and methods:The occlusal enamel and superficial dentin of 90 sound human third molars were cut using water-cooled diamond saw.A total of 60 molars were restored using Surefil one composite, where half were applied without adhesive and the other half with adhesive.The remaining 30 molars were restored with Filtek One composite.All restored molars were exposed to thermocycling and load cycling, where each group was divided into three subgroups according to aging period (24 hours to 3-6 months).Microtensile bond strength was assessed with universal testing machine after sectioning each molar into beams with cross-sectional area 1.0 ± 0.1 mm 2 .Fractured specimens were analyzed using stereomicroscope at 25× magnification to determine the failure mode.Data were analyzed using Kolmogorov-Smirnov, Shapiro-Wilk, and Pearson's Chi-square tests.Results: Surefil one composite without adhesive showed significantly lower bond strength than Surefil one with adhesive and Filtek one composites.Surefil one composite without adhesive showed 100% adhesive failure.Adhesive and mixed failures were noticed in both composites with adhesive application with highest percentage for adhesive failure after aging.Conclusions: Self-adhesive composites microtensile bond strength is enhanced with adhesive application.Conventional composite has superior microtensile bond strength than self-adhesive composite with or without adhesive application.Aging has detrimental impact on microtensile bond strength regardless of composition of composite resin.Clinical significance: Using adhesive with self-adhesive composites improves their bond strength.Long-term clinical results of composite are impaired by aging.More research is required for strong evidence on clinical use of self-adhesive composites.
Authors: Nourhan S Ibrahim, Wael E Jamil, Nermin A Mahmoud
Institutions: Minia University, Al-Azhar University
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4411502553