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Fluoride Release (fluoride + release)

Distribution by Scientific Domains
Medical Sciences100%

Selected Abstracts

Fluoride release and uptake by four new fluoride releasing restorative materials

JOURNAL OF ORAL REHABILITATION, Issue 9 2003
P. Dionysopoulos
Summary, The present study compared the initial fluoride release and release following refluoridation of a conventional glass,ionomer Ketac-Molar (ESPE), a resin-modified glass,ionomer, Vitremer (3M), and two compomers F-2000 (3M) and Hytac (ESPE). Fifteen test specimens were prepared for each brand and immersed in deionized water. The fluoride released was measured every 2 days for 22 days. Refluoridation of the test specimens was done with solutions of 0·02, 0·04 and 0·2% NaF for 5 min on days 22, 30, 38 and 46. The fluoride released from recharged specimens was measured every 2 days until day 54. The fluoride release was highest during the first days after preparation, after which it decreased sharply and then more slowly. The four materials became ,recharged' with fluoride following repeated fluoride exposure in solution, the 0·2% solution being the most effective. From a clinical point of view, the results from this study imply that all the restorative materials tested may act as intra-oral devices for the controlled slow release of fluoride at sites at risk of recurrent caries. Fluoride release and uptake by four new fluoride releasing restorative materials. [source]

Fluoride release and uptake characteristics of aesthetic restorative materials

JOURNAL OF ORAL REHABILITATION, Issue 8 2002
N. Attar
Summary The aims of this study were firstly to investigate the fluoride-releasing characteristics of two composite resins (Tetric and Valux Plus), two polyacid-modified resin composites (Compoglass and Dyract), and conventional glass,ionomer cement (Ceramfil ,). The second aim was to assess the fluoride uptake and subsequent release from the same range of materials. Fifteen discs (6 mm diameter and 1·5 mm height) were prepared for each material. Each disc was immersed in 4 ML of deionized water within a plastic vial. The release of fluoride was measured daily at 1, 2, 3, 4, 5, 15, 30 and 60 days. After daily fluoride release was measured for 60 days, samples were refluoridated in 1000-ppm sodium fluoride (NaF) solutions (pH 6·6) for 10 min and fluoride release was measured daily for a total of 5 days. The release of fluoride from aesthetic restorative materials was measured by using specific fluoride electrode and an ionanalyser. Results were statistically analysed by two-way repeated measure ANOVA and Duncan's multiple range test. The results revealed that all fluoride-containing materials (Ceramfil ,, Compoglass, Dyract, Tetric) released fluoride initially and the release was greatest at the first day. At any time during the test period Ceramfil , released the most and Valux Plus did not release any detectable fluoride (P < 0·01). Sample exposures to 1000 ppm NaF solution increased the 24-h fluoride release from all fluoride-containing materials. This difference lasted only 24,48 h after exposure. Ceramfil , had a tendency to recharge not seen with the other materials (P < 0·05). [source]

Fluoride pit and fissure sealants: a review

INTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, Issue 2 2000
Tonia L. Morphis
There are two methods of fluoride incorporation into fissure sealants. In the first method, fluoride is added to the unpolymerized resin in the form of a soluble fluoride salt that releases fluoride ions by dissolution, following sealant application. In the second method, an organic fluoride compound is chemically bound to the resin and the fluoride is released by exchange with other ions (anion exchange system). This report reviews the literature on the effectiveness of all the fluoride-releasing sealants ,commercial and experimental , that have been prepared using either the former or the latter method of fluoride incorporation. There is evidence for equal retention rates to conventional sealants and for ex vivo fluoride release and reduced enamel demineralization. However, further research is necessary to ensure the clinical longevity of fluoride sealant retention and to establish the objective of greater caries inhibition through the fluoride released in saliva and enamel. [source]

Fluoride release and uptake by four new fluoride releasing restorative materials

JOURNAL OF ORAL REHABILITATION, Issue 9 2003
P. Dionysopoulos
Summary, The present study compared the initial fluoride release and release following refluoridation of a conventional glass,ionomer Ketac-Molar (ESPE), a resin-modified glass,ionomer, Vitremer (3M), and two compomers F-2000 (3M) and Hytac (ESPE). Fifteen test specimens were prepared for each brand and immersed in deionized water. The fluoride released was measured every 2 days for 22 days. Refluoridation of the test specimens was done with solutions of 0·02, 0·04 and 0·2% NaF for 5 min on days 22, 30, 38 and 46. The fluoride released from recharged specimens was measured every 2 days until day 54. The fluoride release was highest during the first days after preparation, after which it decreased sharply and then more slowly. The four materials became ,recharged' with fluoride following repeated fluoride exposure in solution, the 0·2% solution being the most effective. From a clinical point of view, the results from this study imply that all the restorative materials tested may act as intra-oral devices for the controlled slow release of fluoride at sites at risk of recurrent caries. Fluoride release and uptake by four new fluoride releasing restorative materials. [source]

Fluoride release and uptake characteristics of aesthetic restorative materials

JOURNAL OF ORAL REHABILITATION, Issue 8 2002
N. Attar
Summary The aims of this study were firstly to investigate the fluoride-releasing characteristics of two composite resins (Tetric and Valux Plus), two polyacid-modified resin composites (Compoglass and Dyract), and conventional glass,ionomer cement (Ceramfil ,). The second aim was to assess the fluoride uptake and subsequent release from the same range of materials. Fifteen discs (6 mm diameter and 1·5 mm height) were prepared for each material. Each disc was immersed in 4 ML of deionized water within a plastic vial. The release of fluoride was measured daily at 1, 2, 3, 4, 5, 15, 30 and 60 days. After daily fluoride release was measured for 60 days, samples were refluoridated in 1000-ppm sodium fluoride (NaF) solutions (pH 6·6) for 10 min and fluoride release was measured daily for a total of 5 days. The release of fluoride from aesthetic restorative materials was measured by using specific fluoride electrode and an ionanalyser. Results were statistically analysed by two-way repeated measure ANOVA and Duncan's multiple range test. The results revealed that all fluoride-containing materials (Ceramfil ,, Compoglass, Dyract, Tetric) released fluoride initially and the release was greatest at the first day. At any time during the test period Ceramfil , released the most and Valux Plus did not release any detectable fluoride (P < 0·01). Sample exposures to 1000 ppm NaF solution increased the 24-h fluoride release from all fluoride-containing materials. This difference lasted only 24,48 h after exposure. Ceramfil , had a tendency to recharge not seen with the other materials (P < 0·05). [source]