Effect of fluoride varnish on glass ionomer microhardness changes in endogenous acid erosion challenge

Abstract

Objective: This study aimed to assess the effect of fluoride varnish on glass ionomer microhardness changes after endogenous acid erosion challenge. Methodology: In this study, 40 conventional glass ionomer (CGI; Fuji IX) and 40 resin-modified glass ionomer (RMGI; Fuji IILC) discs were fabricated and divided into 4 subgroups (n ¼ 10) for immersion in synthetic gastric acid or saliva for 27 h with/without fluoride varnish application. The surface microhardness was measured at baseline and after immersion, and the change in microhardness was calculated. Data were analyzed using analysis of variance and T-test. Results: A reduction in microhardness was noted in all subgroups following immersion. The lowest change in microhardness of both CGI and RMGI occurred in artificial saliva. In CGI groups, the highest reduction in microhardness occurred in synthetic gastric acid with fluoride varnish application, and the reduction was significantly different from that of the CGI group with fluoride varnish application (p value ¼ .01). In RMGI groups, the highest reduction in microhardness was noted in synthetic gastric acid without fluoride varnish application, and the reduction was significantly different from that of the other groups (p value < .05). Conclusions: Exposure to synthetic gastric acid caused a significant reduction in microhardness of RMGI. Varnish application significantly decreased the acid susceptibility of RMGI, but not that of CGI.

Evaluation of Struthio camelus eggshell as an in vitro alternative to extracted human teeth in preliminary screening studies on dental erosion

“…Specifically, the fluoride varnish demonstrated the ability to significantly decrease the rate of surface loss in both human enamel and ostrich eggshell, from 10.09 to 1.82 µm/h and 5.98 to 1.04 µm/h, respectively (Table 2 ). These results are consistent with previous studies that have also demonstrated the preventive impact of fluoride varnishes (Bezerra et al, 2021 ; Moharramkhani et al, 2021 ).…”

“…These results are consistent with previous studies that have also demonstrated the preventive impact of fluoride varnishes (Bezerra et al, 2021;Moharramkhani et al, 2021).…”

“…This study found that a fluoride varnish used as a preventive treatment was effective in reducing tooth erosion. This is consistent with a number of studies demonstrating the preventive impact of fluoride varnishes (Bezerra et al, 2021 ; Moharramkhani et al, 2021 ). The varnish significantly lowered the rate of surface loss in both human enamel and ostrich eggshell specimens.…”

Enamel Erosion Reduction through Coupled Sodium Fluoride and Laser Treatments before Exposition in an Acid Environment: An In Vitro Randomized Control SEM Morphometric Analysis

“…The most common forms of topical administration of fluoride are toothpaste, gel, varnishes, and mouthrinses. The protective effect of fluoride is due to the formation of a superficial CaF layer that prevents the enamel from being exposed to acids and dissolution [2][3][4]. However, some studies have shown that the efficacy of fluoride therapy in combating dental erosion is limited because it correlates with the constant presence of fluoride in the oral cavity.…”