engleski

Preventive effect of two glass-ionomer cements vs. two composite materials

Aim. The aim of this study was to evaluate preventive efficacy of four materials and their ability to release fluoride. The study evaluated degree of demineralization on hard dental tissues (enamel and cement) of two glass-ionomer cements and two composite materials. Methods. Standardized 40 class V cavities were prepared on buccal and lingual surface of 20 extracted caries free premolars with one half in enamel and one half in cement. Ten cavities of each group were restored with glass ionomer cements Fuji IX (GC), Ketac Molar (3Mespe), composite materials Esthet-x (Dentsply) and Filtek Z 250 (3M) according to manufacturer’ s instructions. Teeth were thermocycled for 1800 cycles between 5-55°C with dwelling time of 10 s. After thermocycling teeth were immersed in demineralising solution (pH 4, 95) for 4 weeks. After 4 weeks teeth were rinsed, enrobed in epoxy resin (Citofix Kit, Struers) and sectioned in 2-3 sections that were evaluated under polarized microscope (100x magnification) (Opton) and photographed (Camedia, Olympus). Demineralization of enamel and cement in contact with materials was measured applying Olympus DP soft, Version 3, 2. Statistical analysis was performed using one factor ANOVA and Tukey HSD test. Results. Lowest level of demineralization on enamel tissue showed Ketac Molar (707). On the cement lower level of demineralization showed Ketac Molar (734) than Esthet-x (1052) and Filtek Z 250 (893). Lower demineralization of enamel was observed considering all tested materials. There was no significant difference between tested materials. Conclusion. Hard dental tissues show lowest level of demineralization in contact with Ketac Molar restorations. Results show that good marginal adaptation is equally important as preventive properties of the material. Further laboratory evaluations are required to obtain more reliable results.

glass-ionomer cement; composite material; demineralization

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