Effect of brushing with two different abrasives on fluoride release by high-viscosity glass ionomer cement

Abstract

Keywords: topical fluoride; glass ionomer cements; toothbrushing; abrasion. IntroductionFluoride release from restorative materials has been proposed as a possible mechanism to reduce the occurrence of dental caries (1,2). Glass ionomers (GIs) are considered important in this regard due to their exceptionally high fluoride release (3,4). Multiple factors, including daily exposure to fluoridated dentifrices, affect the release of fluoride from GIs (5-7). Exposure to 1,250 ppm fluoride slurry for 5 min was shown to significantly increase fluoride release from compomer specimens (8). Furthermore, fluoride re-release from GIs is reportedly increased by brushing the specimens instead of merely storing them in a dentifrice slurry (9). A lower, but more transient and sustained, fluoride release has shown to play a significant role in caries prevention (10). To the best of our knowledge, the effect of brushing with dentifrice slurries containing different abrasive levels on fluoride release of high-viscosity GIs has not been previously reported. Slurries with high abrasive content could enhance fluoride release from GIs owing to the faster abrasion of such materials and exposing deeper, more fluoride-rich layers.The main objective of this study was to investigate the effect of brushing with two levels of abrasives on fluoride release from high-viscosity GIs. We hypothesized that brushing with slurries containing higher abrasive levels would enhance fluoride release from the GI material. Materials and Methods Specimen preparationTo minimize the possible effects of pigments and other GI ingredients, a single shade (A2) of a high-viscosity GI

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

“…This goes well with our observations that specimens were more abraded as the brushing protocol continued. We witnessed the same phenomenon in our previous investigation where abrasion was accompanied by more fluoride release in the brushed groups [12]. Still, the initial high fluoride values diminished with each day of the protocol.…”

“…Even though KF was relatively harder, indicating more resistance to surface abrasion, fluoride release was higher possibly owing to a better recharging potential. It was shown previously that GICs with high fluoride release had more particles exposed owing to the vulnerability to surface abrasion which was not the case in the current investigation since KF had higher microhardness values [12,31].…”

“…It is known that brushing GIC restorations will lead to an enhanced fluoride release [11]. Further, brushing with slurries that contain high abrasive content can lead to further fluoride release enhancement [12]. This is particularly helpful in patients with multiple carious lesions; however, caution must be taken since carious lesions tend to have a softer surface layer compared to sound enamel probably leading to more surface abrasions of these lesions [19,20].…”

“…Furthermore, it was reported previously that fluoride release from GIC can be enhanced when specimens are brushed in the presence of a fluoridated dentifrice slurry [11]. Additionally, brushing with slurries containing high abrasive loads increases the fluoride release from conventional GICs [12]. Still, fluoride release can be dependent on other factors, such as the fluoride concentration of the slurry as well as the brand of the material.…”

Genotoxicity in the oral cells of older people from a Brazilian rural area: a population-based study

“…Then, the specimens were immersed in artificial saliva for 60 min, under gentle agitation, and at room temperature. 18 The specimens were positioned in an automated custom-made toothbrushing machine 18,19 and brushed with the respective abrasive slurries for 15 s (45 back-and-forth movements) using medium stiffness toothbrushes (Soft Oral-B 40, Procter & Gamble, Cincinnati, USA) and a load of 150 g. After brushing, the specimens were rinsed with deionized water for 10s and were stored in artificial saliva in a 150 rpm agitation during the night period 18 20…”