Search for: [Abstract = "Preface\: The development of new systems caused the appearance in 70’ glass ionomer cements. Conventional glass ionomer cements contain pulver with is deionizated glass with fluor and liquid. During next years modification conventional glass ionomer cements has been done and through addition resin have been obtained light cured glass ionomer cements. They have better physical properties – they are harder and more resistant to friction and first of all are resistant to water. Further improvement of filling materials create the appearance of compomers. The most important advantage of some filling materials is the ability of fluoride releasing into external environment. Fluor belongs to the most active chemical elements. It gets into human body with food or air. Fluor is bound with the supporting connective tissue structure of teeth, skin and hair. Fluoride is a natural component of saliva \(0,4 – 26 μmol\/l\). In dentistry the application of fluoride has been found due to its anticariogenic activity. The most important fluoride activities on the hard tooth tissue are reduction of enamel solution, weakening of demineralization and remineralization process acceleration. Well known is also antibacterial fluoride activity. Fluoride can cause cariogenic bacteriostasis and low concentration can disturb creation of acid substances. Fluoride being active with bacterial metabolism can inf"]

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