J Korean Dent Sci.  2024 Mar;17(1):36-44. 10.5856/JKDS.2024.17.1.36.

Effect of Dentin Bonding Agent Acidity on Surface Microhardness of Mineral Trioxide Aggregate

• Im YH
• Lee Y

• KMID: 2554961
• DOI: http://doi.org/10.5856/JKDS.2024.17.1.36

Abstract

Purpose
This study investigated the effect of dentin bonding agent acidity on surface microhardness of MTA.
Materials and Methods
Forty cylindrical molds (3 mm×5 mm) were prepared, and three dentin bonding agents with different acidities: Adper Single Bond 2 (ASB), Single Bond Universal (SBU), and Clearfil SE bond 2 (CSE) were applied to the inner surface of the molds (n=10). No bonding agent was applied in the control group. MTA was mixed and inserted into the molds and sealed with a wet cotton pellet for 4 days. After setting, the Vickers microhardness (HV) test was done at 200, 400, 600 μm from the inner surface of the mold. One-way ANOVA was conducted for all samples. A P-value of less than .05 was considered significant. Tukey HSD test was performed for post-hoc analysis.
Results
The mean HV values and standard deviations were 67.02±11.38 (Con), 48.76±11.33 (ASB), 43.78±11.19 (CSE), 37.84±9.36 (SBU), respectively. The difference between the control group and the experimental groups was statistically significant (P<0.001). The difference between ASB and SBU was statistically significant (P<0.001), while the difference between SBU and CSE was not. There were no statistically significant differences between the various points from the inner surface of the mold within each group (P>0.05).
Conclusion
Results of the current study indicate that use of dentin bonding agents with MTA can reduce the surface microhardness of MTA. Moreover, there is a direct relationship between the acidity of dentin bonding agents and the surface microhardness of MTA.

Keyword

Acidity; Dentin adhesive; Vickers microhardness; Mineral trioxide aggregate