Research Information System
The 7th. International Congress on adhesive Dentistry, Konya, Turkey, 1 June - 03 September 2023, (Summary Text)
Introduction: This study aimed to evaluate the effects of different surface treatments on the repair bond strength between a fiber-reinforced dentin composite and a posterior composite.
Materials and Methods:40 fiber-reinforced dentin composite resin blocks 4x4x4 mm in size were divided into 8 different groups according to the surface preparation methods; (G1) negative control group, (G2) adhesive application, (G3) 50% dimethylsulfoxide (DMSO) application ,(G4) 50% DMSO + adhesive application, (G5) 37% phosphoric acid etch+ adhesive application (G6) air abrasion + adhesive application, (G7) 37% phosphoric acid etch + 50% DMSO application + adhesive application, (G8) air abrasion + 50% DMSO application + adhesive application group. The composite surfaces were repaired in two layers with a posterior composite. Composite sticks were subjected to a micro tensile bond strength test. Fractured surfaces were evaluated using a stereomicroscope (x25)
Short fiber reinforced composite samples’ surfaces were investigated by scanning electron microscope. Shapiro Wilk, one-way ANOVA, and Tukey HSD tests were used for statistical evaluation.
Results:The highest average micro tensile bond strength values were recorded in the eighth group. The lowest mean values were found in the negative control group. Statistically significant μTBS values were obtained in all adhesive-applied groups. SEM images showed that acid etching partially removed residues on the composite surface, while the air abrasion damaged the fiber structures.
Conclusion: In the repair of fiber reinforced dentin composite with posterior composite, it was detected that the adhesive applied groups showed higher average bond strength than the negative control group. It was noted that the application of 50% DMSO without the application of adhesive did not statistically increase the success of the bonding. Acid etch and air abrasion applications on the fiber composite surface roughened with the bur did not provide a statistically significant additional contribution when compared to the group in which only the adhesive was applied.
Clinical Significance: Adhesive application is an effective strategy for repairing a fiber- reinforced dentin composite, without needing additional surface treatments and DMSO application.
Keywords: Short fiber reinforced composite, Composite repair, Dimethylsulfoxide, Microtensile bond strength