Fluoride Release from Two High-Viscosity Glass Ionomers after Exposure to Fluoride Slurry and Varnish

Abstract

The effect of brushing with different fluoride slurries on the fluoride release (FR) of different high-viscosity glass ionomer cements (GICs) was investigated. Fifty-eight discs were fabricated from two high-viscosity GICs (GC Fuji IX (F9) and 3M ESPE Ketac-fil (KF)). Five specimens from each brand were used to measure Vickers microhardness and the remaining were randomly assigned to one of four groups (n = 6) based on two-factor combinations: (1) fluoride concentration in the abrasive slurry (275 or 1250 ppm fluoride as NaF) and (2) immersion in a 22,500 ppm fluoride-containing solution. Specimens were brushed for a total of 20,000 strokes over 4 days with daily FR measurement. Data were analyzed using analysis of variance and Bonferroni tests (α = 0.05). Baseline FR and microhardness values were different between the two tested material brands. Exposure to a 22,500 ppm solution was associated with higher FR but not the exposure to 1250 ppm slurries. Brushing and immersion of glass ionomer cements in a 22,500 ppm F solution led to higher FR that was more sustained for KF. Type of the glass ionomer, progressive brushing, and fluoride varnish affected FR but not the fluoride content in the abrasive slurry.

Effect of brushing on surface roughness, fluoride release, and biofilm formation with different tooth-colored materials

“… 24 The study by Hani M. Nassar showed that the amount of fluoride released from glass ionomer-based materials were decreased after undergone brushing since high fluoride release only in early period and abated significantly to reach an ambient sustained fluoride release over time. 32 Supported by the study of Wiegand A. which stated that brushing leads to a reduction of the surface concentration of fluoride. 33 Consequently, the amount of fluoride released significantly decreased after the brushing simulation in all materials except Z350XT.…”

Effects of ionizing radiation on surface properties of current restorative dental materials

“…Thus, the higher exposition of filler particles provided increased surface hardness values in the conventional resin composite tested. Also, a glass ionomer cement is softer than other restorative materials [38]. In this way, the resin coat remotion in the conventional glass ionomer cement post-radiation exposed a softer and more hydrophilic material with a decreased hardness and increased wettability.…”

Dental Restorative Materials for Elderly Populations

“…Studies have shown that glass ionomer can inhibit the growth of Streptococcus mutans and Lactobacillus , therefore, it can prevent secondary caries to a certain extent but cannot inhibit the growth of Candida albicans [ 33 ], one of the pathogenic bacteria responsible for root caries [ 34 ]. Since the release of fluoride ions is related to the glass ionomer composition, most high-viscosity and resin-modified glass ionomers have a lower total fluoride ion release than the conventional ones [ 35 ], therefore, conventional glass ionomers have better antibacterial properties [ 36 ]. The remineralization properties of glass ionomer are also related to the release of fluoride ions [ 37 ].…”