Effect of different adhesive strategies on the microshear bond strength of calcium-silicate-based materials
Journal of Advanced Oral Research. 2022;13(2):191-199.
ABSTRACT
Aim: To evaluate the microshear bond strength (μSBS) of mineral trioxide aggregate and Biodentine to various resin-based materials using different adhesive strategies.
Materials and Methods: Three resin-based materials—a self-adhering resin composite with or without acid etching (Vertise flow; Kerr, Orange, CA, USA), a conventional flowable composite with a total-etch adhesive (Filtek Ultimate Flowable; 3M ESPE, St. Paul, MN, USA), and a flowable resin-modified glass ionomer cement (RMGIC) without any surface modification (Ionoseal; VOCO GmbH, Cuxhaven, Germany)—and two calcium-silicate-based materials—Biodentine and BIOfactor mineral trioxide aggregate (MTA)—were tested. A total of 100 cylindrical acrylic molds were prepared. Biodentine and BIOfactor MTA were prepared and placed into the central holes on the molds. Specimens were divided into two main groups according to materials and into five subgroups (n = 10). μSBS were evaluated using a μSBS testing device. The failure modes were examined under a stereomicroscope with magnification. They were categorized as adhesive, cohesive, or mixed. Data were analyzed using two-way analysis of variance (ANOVA) and Tukey test. The significance level was taken as a = 0.05.
Results: It was observed that both calcium-silicate-based material type and resin-based material type influenced the μSBS significantly according to two-way ANOVA. Biodentine exhibited higher bond strength values than MTA. However, no statistically significant interaction was demonstrated between these factors (P = .396). The μSBS values of intermediate materials to Biodentine and MTA were listed from the lowest to the highest as follows: RMGIC < Acid Etch + RMGIC < SARC (self-adhering resin composite) < FC (flowable composite) < Acid Etch + SARC.
Conclusion: Self-adhering composites can be used on calcium-silicate-based materials in vital pulp treatments because of their mechanical properties. Acid-etching ensures high μSBS values. Although the μSBS of Biodentine were higher than MTA according to this study's results, there was no statistically significant difference in μSBS of FC and acid-etched SARC to MTA.
KEYWORDS
Resin composite · Resin-modified glass ionomer cement · Acid-etching · Calcium-silicate-based material · Microshear bond strength
STUDY SUMMARY
This in vitro study measured the microshear bond strength of two calcium-silicate-based materials to three resin-based materials applied with different adhesive strategies, using 100 specimens and examining failure modes under a stereomicroscope. Both the calcium-silicate material and the resin-based material significantly influenced bond strength, with Biodentine giving higher values than the MTA cement and no significant interaction between the two factors. Bond strength ranked lowest for the resin-modified glass ionomer and highest for the acid-etched self-adhering composite under the conditions tested.