Topical fluoride application is able to reduce acid susceptibility of restorative materials

Abstract

This study aimed to investigate the effect of topical fluoride application on the acid susceptibility of restorative materials. Four restorative materials were investigated in this study: 2 composite resins (Tetric EvoCeram and Filtek Silorane), a polyacid-modified resin composite (Dyract Extra), and a conventional glass-ionomer cement (Ketac Fil Plus). The samples were treated once with 1 of 8 different fluoride solutions (TiF4, NaF, AmF, and SnF2, each at native pH or pH 4) for 3 min or remained untreated (control). The samples were then eroded by citric acid (pH 2.6) for 5 days (6×1 min daily). Erosive substance loss, surface topographic and compositional changes were investigated using surface profilometry, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS), respectively, after fluoride pretreatment and after erosion. The results indicate high-concentrated AmF solution at native pH was effective in inhibiting erosion in the conventional glass-ionomer cement and polyacid-modified resin composite.

Water sorption and solubility of a nanofilled composite resin protected against erosive challenges

“…The erosion phenomenon induces loss of substances, surface degradation and reduction of abrasion resistance of restorative materials. [15] In addition, the surface of restorative material is more susceptible to erosive attacks than when compared to dental enamel. [15] Previous studies have shown that when the restorative material, especially the composite resin, is exposed to the erosive challenge, for example there is loss of hardness, greater wear and marginal infiltration.…”

“…[15] In addition, the surface of restorative material is more susceptible to erosive attacks than when compared to dental enamel. [15] Previous studies have shown that when the restorative material, especially the composite resin, is exposed to the erosive challenge, for example there is loss of hardness, greater wear and marginal infiltration. [15,16] When exposed to chemicals substances, the resin matrix of the composite resin can be softened and its constituents can be filtered out of the structure, causing functional and aesthetic damage to the restoration.…”

“…[15] Previous studies have shown that when the restorative material, especially the composite resin, is exposed to the erosive challenge, for example there is loss of hardness, greater wear and marginal infiltration. [15,16] When exposed to chemicals substances, the resin matrix of the composite resin can be softened and its constituents can be filtered out of the structure, causing functional and aesthetic damage to the restoration. [17] The chemical composition of the organic matrix of the restorative material has a direct effect on its degradation.…”

“…[28] There are evidences that shows a possible damaging effect of fluoride on restorative materials, causing changes in morphological and abrasion resistance. [15] In addition, fluoride can cause depolymerization of the matrix-body constituent interface, causing loss of important constituents of the composite resin. [15] In the present study, this fact can be confirmed, since the topical application of fluoride presented a similar result to the absence of surface protection, in the different levels of simulated erosion.…”

Restorative Therapy of Erosive Lesions

“…In their study of the susceptibility of five restorative materials to damage by common erosive acids, Wan Bakar and McIntyre [29] found in vitro restorations of resin composite or porcelain not to be affected at all by the erosive challenges, while restorations of the resin-modified glass ionomer cement were moderately damaged and the two conventional glassionomer cements were severely damaged. Besides confirming that resin composites have higher resistance to erosive attack than conventional glassionomer cement and compomer as well as reporting resin composite also to have higher resistance to topical fluoride application, Yu et al [30] found the application of a high-concentrated AmF solution at native pH to increase the acid resistance of conventional glass-ionomer cement and compomer.…”