Borate adhesive system protects against Effect of citric acid erosion on enamel and dentin

This study examined the ability of a borate adhesive to protect enamel/dentin surfaces from acidic erosion and its effect on the shear bond strength (SBS) of enamel/dentin to resin composite.

180 human enamel/dentin specimens were utilized. Enamel buccal surfaces were etched with phosphoric acid and then divided into (EBG) borate glass adhesive group; (ERS) resin-adhesive system group; (EF) fluoride gel 1.23% group, and enamel control (EC) group; followed by bonding to orthodontic-buttons. The dentin specimens were conditioned by EDTA (Ethylene-diamine-tetra-acetic acid) and divided into (DBG) borate glass resin, (DRS) resin adhesive; (DDA) group had a dentin-desensitizing agent VivaSens and (DC) control group. The treated enamel/dentin specimens had their SBS to composite. The enamel/dentin specimens were exposed to 1% citric acid (18 min). Enamel/dentin specimens were examined by (SEM/EDS) scanning-electron-microscope equipped with electron-dispersive-spectroscopy and (FTIR/ATR). Analysis-of-Variance (ANOVA) was used to compare the SBS and the Wilcoxon-signed-rank test was used to compare the enamel/dentin areas protected by the applied agents before/after erosion (p = 0.05).

Results

• There was no significant difference in SBS among all groups except for (DDA) group which showed a significant decrease 
• (EBG) and (DBG) groups were the only groups that significantly protected enamel and dentin from erosion 
• FTIR/ATR showed that erosion altered the chemical structure of (DRS), (DDA), and (DC) groups but did not affect the other enamel/dentin groups.
• The degree of conversion of the borate-adhesive system was acceptable.

Thus, the Borate adhesive system released calcium and phosphate compounds that decreased the erosive activity of the citric acid resulting in protecting simulated dentin-hypersensitive areas and enamel from erosion without affecting the SBS to resin-composite. A Borate adhesive system can be adopted as a therapeutic agent in a fully integrated program for protecting dentin-hypersensitive areas and in enamel next to orthodontic fixed appliances.

Reference:

Mona A. Abbassy, Ahmed Ibrahim Masoud, Fahd Faiz Alsulaimani, Ahmed S. Bakry. Effect of citric acid erosion on enamel and dentin and possible protection by a novel bioactive borate adhesive system, Journal of Dentistry, Volume 124, 2022, 104208, ISSN 0300-5712, https://doi.org/10.1016/j.jdent.2022.104208.