Özet:

Purpose: The purpose of this study is to assess the microstability, swelling resistance, water absorption and solubility of different composite resins polimerized by direct or indirect polimerization techniques. Materials and Methods: 3 composite resins classified according to the resin matrix were selected: U200 (3M ESPE), Grandio (VOCO), Xtrafil (VOCO). Composite resins were divided into three subgroups according to the polymerization technique: LED (Eliapar, 3M ESPE), LED+ indirect light (DI 500 Coltene), indirect light + heat + pressure (Tescera ATL, Bisco Dental). For each subgroup, seven rectangular samples (25mm x 2mm x 2mm) were made and three-point curvation tests were made for curvation resistance values. Seven cylindrical samples (diameter: 8mm, thickness: 2mm) were made to determine Vickers' hardness, water absorption degree and resolution. Cylindrical samples were stored in distilled water at 37 ° C for 24 hours and microserity values were measured by a Vickers hardness test device. The samples prepared for the water absorption test were stored 24 hours under the same conditions and the water absorption values were measured. The same samples were dried until the fixed mass was obtained in the decoctor and resolution measurements were made. The data was analyzed with the two-way ANOVA and Tukey's post-hoc test (α = 0.05). The findings: The interaction between polymerization techniques and composite resins was meaningful only in the vibration resistance values (p <0.05).In vibration resistance, microserity and water absorption, the high value was seen in samples polymerized with LED+indirect light.  If the resolution is high, it is seen in examples that are polymed by indirect light + heat + pressure. The method of indirect polymerization improved the microhardness and swelling resistance values of composite resins but negatively affected the water absorption and resolution values. The aim of this study was to evaluate the flexural strength, microhardness, water sorption and solubility of different composite resins polymerized with direct and indirect polymerization techniques. Materials and Methods: Three composit resines, classified according to their resin matrix, were selected: U200 (3M ESPE), Grandio (VOCO), Xtrafil (VOCO). Composite resins were divided into three subgroups according to polymerization technique: LED (Eliapar, 3M ESPE), LED + indirect light (DI 500 Coltene), indirect light + heat + pressure (Tescera ATL, Bisco Dental). Seven rectangular specimens (25mmx2mmx2mm) of each subgroup were prepared and 3-point bending tests were performed for flexural strength values. To determine Vickers hardness, water sorption and solubility tests; seven cylindrical specimens (diameter: 8mm thickness: 2mm) were prepared. The cylindrical specimens were stored in distilled water for 24 hours at 37◦C, and the microhardness values were measured with a Vickers hardness tester. Then, specimens were stored in the same conditions for 24 hours and water sorption values were measured. The same specimens were kept in deciccators and dried for solubility measurements until constant mass was achieved. Data were analyzed by two-way ANOVA and Tukey's post-hoc test (α=0.05). Results: The interaction between polymerization techniques and composite resins was significant only in flexural strength values (p<0.05). The highest values were obtained for flexural strength, microhardness and water sorption with indirect light and for solubility with indirect light+heat+pressure. Keywords: composite resin, mechanical properties, polymerization technique polymerization technique polymerization technique

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