The Effect of Different Adhesive Resins, Composite Resins and Thermal Cycling on the Repair Bond Strength of Bulkfill Composite Resin

Year 2022, Volume: 23 Issue: 1, 31 - 39, 30.03.2022

Soley Arslan , Hacer Balkaya , Burhanettin Avcı , Ayşenur Doğan

Abstract

Objective: This study evaluated the influence of different adhesives, composites and thermal cycling on the repair bond strength of bulkfill composite.
Materials and Methods: A total of 54 bulkfill composite resin disks were obtained. The samples were stored in distilled water for 14 days and then the sample’s surfaces were air-abraded with Al2 O3 particles, etched with phosphoric acid, washed and dried. An adhesive was applied to the samples after the silane application. The samples were randomly divided into three main groups according to the type of adhesive resin used (a self-cured universal adhesive, a total-etch adhesive and a self-etch adhesive). After the adhesive application, four composite resin cylinders were placed on the sample surface using three different repair composites (bulkfill composite, microhybrid composite and nanohybrid composite). A total of 5000 thermal cycles were applied to half of the samples (n=12). A microshear bond strength test was performed using a universal tester. The data obtained were analyzed using Mann-Whitney U and Kruskal-Wallis tests.
Results: Of the repair composites, bulkfill composite tended to show the highest bond strength. There was no significant difference between the microhybrid and the nanohybrid composite groups (p>0.05). Generally, the adhesives did not significantly affect the repair bond strength.
Conclusion: The use of bulkfill composite to repair bulkfill composite provides more efficient repair bond strength. The tested adhesives can be used safely to repair bulkfill composite. The repair bond strength was not negatively affected after 5000 thermal cycles.

Keywords

Bulkfill composite, composite repair, microshear bond strength, self-cured adhesive

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