Bond strength comparison of a fiber‐reinforced composite resin: Different dentin conditions and preparation techniques

Abstract

AbstractThis study aimed to compare the bond strength of a fiber‐reinforced composite resin with traditional and bulk‐fill composite resins under different dentin conditions and preparation techniques. Eighty molar teeth, excluding the mesio‐distal half of the occlusal dentin surfaces of each teeth, were isolated with acid‐resistant nail varnish and stored in a demineralisation solution (pH 4.5). After mechanical removal of the varnish, the teeth were buried in acrylic resin blocks. In every composite resin group, one‐half of the specimens were prepared with a diamond bur and another half with Er: YAG laser. Then, the specimens were divided into four groups of composite resins (Filtek Z250, G‐aenial Posterior, SonicFill 2, Ever X Posterior) (n = 10). Shear bond strengths were measured using a universal testing device, and failure types were determined with stereomicroscope images. SEM images were obtained at 1000× magnification. Data were analyzed using a three‐way analysis of variance (ANOVA), and Bonferroni correction was used for multiple comparisons (p = .05). Differences in the dentin surface affected the bond strength results (p < .05), whereas there was no significant difference between cavity preparation methods (p > .05). EverX Posterior showed the highest bond strength results. Within the limitations of this study, fiber‐reinforced composite resin exhibited successful bond strength results in addition to improved mechanical properties.Research highlights Fiber‐reinforced composite had successful bond strength values. Bond strength values of sound dentin groups were higher than those of caries‐affected dentin groups. The use of an Er: YAG laser for preparation did not lead to insufficient bond strength results.