Inhibition of enamel demineralization by buffering effect of S‐PRG filler‐containing dental sealant

Abstract

The buffering capacity and inhibitory effects on enamel demineralization of two commercially available dental sealants were evaluated in this study. The effects of filler particles were also examined. Disks of enamel and cured sealant materials of BeautiSealant (silica or S-PRG filler) or Teethmate F-1 were incubated in lactic acid solutions (pH 4.0) for 1-6 d. The pH changes and amounts of ions released in the solutions were assessed, and enamel surfaces were observed using a scanning electron microscope. The pH of the solution with BeautiSealant (S-PRG filler) was neutralized from pH 4.0 to pH 6.1 (after incubation for 1 d) and from pH 4.0 to pH 6.7 (after incubation for 6 d). In addition, no release of calcium ions was detected and the enamel surface was morphologically intact in scanning electron microscopy images. However, the pH of the solution with Teethmate F-1 remained below pH 4.0 during incubation from days 1 to 6. Calcium release was increased in solutions up to and after 6 d of incubation. Scanning electron microscopy images showed that the structures of hydroxyapatite rods were exposed at the specimen surfaces as a result of demineralization. Ions released from S-PRG filler-containing dental sealant rapidly buffered the lactic acid solution and inhibited enamel demineralization.

Synthesized mesoporous silica and calcium aluminate cement fillers increased the fluoride recharge and lactic acid neutralizing ability of a resin-based pit and fissure sealant

“…The results of our study confirmed the findings of previous studies showing that glass-ionomer material increased the pH of a lactic solution 13,42) . In agreement with previous studies, we determined that calcium aluminate cement and silica filler also increase the pH of an acid solution 43,44) . Higher pH tends to reduce demineralization and stimulate remineralization, resulting in a reduced prevalence of dental caries 13,42) .…”

Three-year clinical evaluation of posterior composite restorations placed with a single-step self-etch adhesive

“…Strontium and fluoride also increase the acid resistance of teeth by converting hydroxyapatite to strontium apatite and fluorapatite (29). S-PRG fillers exert a modulation effect that neutralizes the pH of the surrounding environment after contact with acidic solutions (30). The present study was adequately randomized and patients who did not maintain an acceptable standard of oral hygiene were not excluded from the study.…”

The effects of single application of pastes containing ion-releasing particles on enamel demineralization

“…A surface reaction-type pre-reacted glassionomer (S-PRG) filler forms a stable glass-ionomer phase by pre-reacting acid-reactive glass-containing fluoride with polycarboxylic acid in the presence of water [13][14][15] , and it can release Al, B, F, Na, Si, and Sr ions. Supplying Si and Na ions into the surrounding environment leads to a buffering effect 16,17) , further inhibiting demineralization. In addition, Si and F ions are known to improve the acid resistance of teeth by converting hydroxyapatite to strontiumapatite 18,19) and fluoroapatite, respectively [19][20][21] .…”