Dört Farklı Cam İyonomer Esaslı Restoratif Materyalin Kesme Bağlanma Dayanıklılığı ve Mikrosızıntı Açısından İn Vitro Olarak Karşılaştırılması
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Meral, E. In Vitro Evaluation of Shear Bond Strength And Microleakage of Four Different Glass Ionomer Based Restorative Materials, Hacettepe University, Department of Restorative Dentistry, Specialization thesis, Ankara, 2017 The aim of this study was to evaluate the microleakage and shear bond strength of 4 different glass ionomer based restorative materials. For shear bond strength test 30, for microleakage test 32 human third molar was used in the study. For shear bond strength test, teeth were divided vertically into 2 sections (buccal-lingual), and each section mounted into acrylic blocks. The surfaces were ground flat to expose dentin and the specimens were divided randomly into four groups (n=15). One of Equia, Zirconomer, Glass Carbomer or Riva Self-cure materials, were applied to each group and after the specimens stored in distilled water for 24 hours, shear bond testing was performed using a universal testing machine. The data were analysed using ANOVA and Tukey tests. A total of 64 class V cavities were prepared both buccal and lingual surfaces for microleakage evaluation. Then the teeth were divided into 4 groups (n=16) and each group restored with one of the following materials; Equia, Glass Carbomer, Zirconomer, Riva Self-cure. The teeth were then stored in distilled water for 24 hours and thermocycled 5000 times (5-55). They were then immersed in 0,5% basic fuchsin solution for 24 hours, sectioned and analysed by steromicroscopy. The degree of dye penetration was recorded and analysed using Kruskal Wallis and Wilcoxon tests. The highest shear bond strength was observed in Glass Carbomer group, other three groups showed no significant differences from each other. All 4 materials showed similar degrees of microleakage in enamel margins, whereas in dentin margins, Equia and Zirconomer showed lower microleakage scores than Glass Carbomer cement. Also internal crack lines inside Glass Carbomer cement was observed. It can be concluded that; while Equia, Zirconomer and Riva Self-cure were observed as clinically suitable materials,Glass Carbomer Cement was found to be clinically insufficient in long term and further investigations must be performed on the performance of Glass Carbomer cement.