Fluoride Release from a Resin-modified Glass-ionomer Cement in a Continuous-flow System: Effect of pH

2003 ◽  
Vol 82 (10) ◽  
pp. 829-832 ◽  
Author(s):  
C.M. Carey ◽  
M. Spencer ◽  
R.J. Gove ◽  
F.C. Eichmiller
Keyword(s):  
Continuous Flow ◽  
Glass Ionomer Cement ◽  
Measuring System ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
System Effect ◽  
Dental Tissues ◽  
Resin Modified Glass Ionomer ◽  
Dental Restorative ◽  
Ionomer Cement

Fluoride is added to many dental restorative materials, including glass-ionomer cements, for the specific purpose of leaching fluoride into the surrounding tissues to provide secondary caries inhibition. During the caries process, an acidic environment attacks the dental tissues as well as the glass-ionomer cement. We hypothesized that pH significantly affects the rate of release of fluoride from the glass-ionomer cement. A continuous-flow fluoride-measuring system that monitors the amount of fluoride released over time was used to determine the release of fluoride from a resin-modified glass-ionomer cement (KetacFil®). The results show that the release rate began with a fast burst of fluoride which quickly diminished to low levels in 3 days. Under neutral pH conditions, the rate of fluoride release at 72 hrs was significantly slower than at pH 4.

scholarly journals Fluoride-Releasing Dental Restorative Materials: An Update

2014 ◽  
Vol 18 (2) ◽  
pp. 60-69 ◽  
Author(s):  
John W. Nicholson
Keyword(s):  
Glass Ionomer Cement ◽  
Composite Resins ◽  
Glass Ionomer ◽  
Acid Attack ◽  
Dental Cement ◽  
Dental Restoratives ◽  
Resin Modified Glass Ionomer ◽  
Dental Restorative ◽  
Natural Tooth ◽  
Ionomer Cement

SUMMARYThe fluoride ion has a well-established beneficial role in dentistry in protecting the teeth from assault by caries. It is known to contribute to the dynamic mineralisation process of the natural tooth mineral, and also to become incorporated with the mineral phase, forming a thin layer of fluorapatite. This is more resistant to acid attack than the native hydroxyapatite, hence protects the tooth against further decay. Other recently discovered aspects of the role and uptake of fluoride will also be discussed.One of the widely used dental restoratives, the glass-ionomer dental cement, is able to release fluoride in a sustained manner that may continue for many years, and this is seen as clinically beneficial. The closely related resin-modified glass-ionomer cement, and also the polyacid-modified composite resin (“compomer”) are able to do the same. There are also fluoride-containing conventional composite resins able to release fluoride.These various materials are reviewed and the way in which they release fluoride are described, as well as the effectiveness of the release at the levels involved. Studies of effectiveness of fluoride release from these various classes of material are reviewed, and shown to suggest that release from conventional and resin-modified glass-ionomers is more beneficial than from composite resins. This is attributed to 2 causes: firstly, that it is not possible to replace the lost fluoride in composites, unlike glass-ionomers, and secondly because the other ions released from glass-ionomers (calcium, phosphate) are able to contribute to local remineralisation of the tooth. The absence of these other ions in fluoridated composites means that remineralisation is able to occur to a lesser extent, if at all.

Effects of extraction media upon fluoride release from a resin-modified glass-ionomer cement

1998 ◽  
Vol 2 (3) ◽  
pp. 143-146 ◽  
Author(s):  
W. Geurtsen ◽  
P. Bubeck ◽  
G. Leyhausen ◽  
F. Garcia-Godoy
Keyword(s):  
Glass Ionomer Cement ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

scholarly journals Effect of Hydroxyapatite on Surface Roughness of Zirconomer, and Conventional and Resin-Modified Glass Ionomers

2021 ◽  
Author(s):  
Farahnaz Sharafeddin ◽  
Somaye Bahrani
Keyword(s):  
Surface Roughness ◽  
Glass Ionomer Cement ◽  
Study Groups ◽  
Distilled Water ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Dental Restorative ◽  
One Way Anova ◽  
Ionomer Cement

Objectives: Glass ionomer cements (GICs) are among the most popular dental restorative materials, but their use is limited due to their clinical disadvantages. Many efforts have been made to improve the properties of these materials by adding various fillers. Incorporation of hydroxyapatite (HA) into the GICs is considered to improve the physical properties of restorations, and may prevent treatment failure. This study aimed to evaluate the surface roughness (Ra) of a conventional glass ionomer cement (CGIC), a resin-modified glass ionomer (RMGI) and a Zirconomer with and without micro-hydroxyapatite (µHA). Materials and Methods: This experimental study was conducted on 6 groups (n=10) including CGIC, CGIC + µHA, RMGI, RMGI + µHA, Zirconomer, and Zirconomer + µHA. A total of 60 disc-shaped samples (6 mm × 2 mm) were prepared in plastic molds and were stored in distilled water for 24 h. After polishing of the specimens, their Ra was measured by a profilometer in micrometers (µm). The data were analyzed using two and one-way ANOVA, Tukey's HSD test, and independent t-test. Results: Incorporation of µHA resulted in statistically significant differences in Ra between the study groups (P<0.05). Following the incorporation of µHA, the Ra significantly decreased in CGIC (P=0.013) and Zirconomer (P=0.003). However, addition of µHA to RMGI resulted in a significant increase in its Ra (P<0.001). Conclusion: Addition of µHA decreased the Ra of Zirconomer and CGIC, and increased the surface roughness of RMGI samples.

scholarly journals Fluoride release profile of a nanofilled resin-modified glass ionomer cement

2011 ◽  
Vol 22 (4) ◽  
pp. 275-279 ◽  
Author(s):  
Marco Aurélio Benini Paschoal ◽  
Carla Vecchione Gurgel ◽  
Daniela Rios ◽  
Ana Carolina Magalhães ◽  
Marília Afonso Rabelo Buzalaf ◽  
...  
Keyword(s):  
Resin Composite ◽  
Linear Regression Analysis ◽  
Glass Ionomer Cement ◽  
Strong Relationship ◽  
Release Profile ◽  
Dental Practice ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

The present study aimed to compare the fluoride (F-) release pattern of a nanofilled resin-modified glass ionomer cement (GIC) (Ketac N100 - KN) with available GICs used in dental practice (resin-modified GIC - Vitremer - V; conventional GIC - Ketac Molar - KM) and a nanofilled resin composite (Filtek Supreme - RC). Discs of each material (n=6) were placed into 4 mL of deionized water in sealed polyethylene vials and shaken, for 15 days. F- release (μg F-/cm²) was measured each day using a fluoride-ion specific electrode. Cumulative F- release means were statistically analyzed by linear regression analysis. In order to analyze the differences among materials and the influence of time in the daily F- release, 2-way ANOVA test was performed (α=0.05). The linear fits between the cumulative F- release profiles of RC and KM and time were weak. KN and V presented a strong relationship between cumulative F- release and time. There were significant differences between the daily F- release overtime up to the third day only for GICs materials. The daily F- release means for RC were similar overtime. The results indicate that the F- release profile of the nanofilled resin-modified GIC is comparable to the resin-modified GIC.

scholarly journals Biophysical and Fluoride Release Properties of a Resin Modified Glass Ionomer Cement Enriched with Bioactive Glasses

Symmetry ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 494
Author(s):  
Ascensión Vicente ◽  
Francisco Javier Rodríguez-Lozano ◽  
Yolanda Martínez-Beneyto ◽  
María Jaimez ◽  
Julia Guerrero-Gironés ◽  
...  
Keyword(s):  
Cell Migration ◽  
Bond Strength ◽  
Glass Ionomer Cement ◽  
Fluoride Ion ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
Ion Release ◽  
Bioactive Glasses ◽  
Resin Modified Glass Ionomer ◽  
Ionomer Cement

The aim of this study was to evaluate the bond strength, microleakage, cytotoxicity, cell migration and fluoride ion release over time from a resin-modified glass-ionomer cement (RMGIC) enriched with bioactive glasses (BAGs) and a nanohybrid restorative polymer resin agent used as adhesion material in the cemented brackets. One hundred and twenty bovine lower incisors were divided into three groups: (Transbond Plus Self Etching Primer (TSEP)/Transbond XT (TXT), TSEP/ACTIVA, orthophosphoric acid gel/ACTIVA) and brackets were bonded. A bond strength test and microleakage test were applied. A fluoride release test was applied after 60 days for the TXT and ACTIVA group. To evaluate cytotoxicity and cell migration, a cell viability and scratch migration assay were done for each group. p values < 0.05 were considered significant. Regarding bond strength and microleakage test, no significant differences were found between TSEP/TXT and TSEP/ACTIVA. At 6.4 pH, ACTIVA showed a higher degree of fluoride ion release, which increased with acid pH (3.5), with a maximum fluoride secretion at 30 days. MTT assay revealed that TXT reduces the viability of gingival cells with significant differences (p < 0.001) compared to the untreated cells (control group). ACTIVA provides optimal adhesive and microfiltration properties, releases substantial amounts of fluoride ions in both acid and neutral media, and its biocompatibility is greater than that of traditional composite resin adhesive systems.

Fluoride Release from Glass Ionomer Cement and Resin-modified Glass Ionomer Cement Materials under Conditions Mimicking the Caries Process

2021 ◽  
Author(s):  
A Brenes-Alvarado ◽  
JA Cury
Keyword(s):  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Fluoride Concentration ◽  
Negative Control ◽  
Fluoride Release ◽  
Glass Ionomer ◽  
Period 2 ◽  
Resin Modified Glass Ionomer ◽  
Ph Cycling ◽  
Ionomer Cement

SUMMARY The anticaries potential of restorative ionomeric materials should be evaluated under a pH-cycling regime that simulates the caries process of demineralization and remineralization. Ten glass ionomer cement (GIC) materials and five resin-modified glass ionomer cement (RMGIC) materials were evaluated. A resin composite was used as a negative control. Six discs of each material were immersed for 6 and 18 hours each day in demineralizing (De-) and remineralizing (Re-) solutions, respectively. The solutions were changed daily over 12 days, during which the fluoride concentration was determined using an ion-specific electrode. The results were expressed as (1) the daily fluoride concentration in the De- and Re- solutions (μg F/ml), (2) the amount of fluoride released daily in the De- + Re- solution per area of specimens (μg F/cm2/day), and (3) the cumulative release over the 12-day period (μg F/cm2). During the first days, all materials showed a surge in fluoride release, followed by a gradual decline; however, three distinct patterns were observed, specifically: (1) greater fluoride release in the De- solution compared to the Re- solution during the study period; (2) an initial higher release in De- solution; and (3) a similar release in both solutions over the whole period. The materials differed statistically (p&lt;0.05) with respect to daily and cumulative fluoride release. One GIC (Maxxion R) and one RMGIC (Resiglass R) had the highest and lowest ability to release fluoride, respectively. In conclusion, the GICs and RMGICs evaluated exhibited distinct qualitative and quantitative patterns of fluoride release under conditions simulating the caries process, which might reflect their anticaries potential.

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