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    Bonding performance of two newly developed self-adhering materials between zirconium and dentin
    (Medknow Publications & Media Pvt Ltd, 2015) Cebe, Mehmet Ata; Polat, Serdar; Cebe, Fatma; Tunçdemir, Makbule Tuğba; İşman, Eren
    Purpose: This study evaluated the effect of four resin materials on the shear bond strength (SBS) of a ceramic core material to dentin. Materials and Methods: Sixty molar teeth were embedded in a self-curing acrylic resin. All specimens were randomly divided into four groups of teeth, each according to the resin cement used. Sixty cylinders were then luted with one of the four resin materials to dentin (GC EQUIA, Panavia F, Variolink II and Vertise). Then, specimens were stored in distilled water at 37 (o) C for one day. Shear bond strength of each specimen was measured using a universal testing machine at a crosshead speed of 0.5 mm/minute. The bond strength values were calculated in N, and the results were statistically analyzed using a Kruskal-Wallis and Bonferroni corrected Mann-Whitney U tests. Results: The shear bond strength varied significantly depending on the resin materials used ( P < 0.05). The specimens luted with GC EQUIA showed the highest shear bond strength (25.19 6.12), whereas, the specimens luted with Vertise flow (8.1 2.75) and Panavia F (11.17 3.89) showed the lowest. Conclusion: GC EQUIA material showed a higher shear bond strength value than other resin materials.
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    Comparison of eluted monomer from different indirect and direct resin composites
    (Taylor & Francis Ltd, 2017) Cebe, Fatma; Cebe, Mehmet Ata; Polat, Serdar; Bıçakçı, Hasan
    Indirect resin composites used in indirect restorations have been used as alternative methods to avoid the negative effects of a direct application. The composition and structure of these are similar to a direct composite. Several authors have discussed the elution monomer from resin composites because it is a crucial factor in optimizing the physical properties and biocompatibility of resin composites. The aim of this study was to compare the elution of monomers from different resin composites using high-performance liquid chromatography (HPLC). Indirect composites including Signum, Gradia, and Solidex, and direct composite Filtek Ultimate were used. The samples (2 x 5 mm) were prepared and polymerized for 20 seconds with a light-emitting diode unit. A secondary curing was then applied to the indirect resin composites. After fabrication, each sample was immediately immersed in a 75 wt% ethanol/water solution and analyzed by HPLC. The obtained data were analyzed with one-way ANOVA and Tukey HSD (p < 0.05). Residual monomers were eluted from indirect and direct resin composites and the amount of eluted monomers increased over time. The highest mean concentrations of residual Bis-GMA, UDMA, TEGDMA, and HEMA were detected with the Filtek Ultimate (2,342 mu M), Solidex (7,908 mu M), Signum (2.8 mu M), and Filtek Ultimate (9.7 mu M), respectively. The highest amount of eluted monomer concentrations detected was viewed as critical for toxic reactions in human cells.
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    Evaluation of the bond strength between aged composite cores and luting agent
    (Korean Acad Prosthodontics, 2015) Polat, Serdar; Cebe, Fatma; Tunçdemir, Alirıza; Öztürk, Caner; Üşümez, Aslıhan
    PURPOSE The aim of this study was to evaluate effect of different surface treatment methods on the bond strength between aged composite-resin core and luting agent. MATERIALS AND METHODS. Seventy-five resin composites and also seventy-five zirconia ceramic discs were prepared. 60 composite samples were exposed to thermal. aging (10;000 cycles, 5 to 55 degrees C) and different surface treatment. All specimens were separated into 5 groups. (n=15): 1) Intact specimens 2) Thermal aging-air polishing 3) Thermal aging- Er:YAG laser irradiation 4) Thermal aging- acid etching 5) Thermal-aging. All specimens were bonded to the zirconia discs with resin cement and fixed to universal testing machine and bond strength testing loaded to failure with a crosshead speed of 0.5 mm/min. The fractured surface was classified as adhesive failure, cohesive failure and adhesive-cohesive failure. The bond strength data was statistically compared by the Kruskal-Wallis method complemented by the Bonferroni correction Mann-Whitney U test. The probability level for statistical significance was set at alpha=.05. RESULTS. Thermal aging and different surface treatment methods have significant effect on the bond strength between composite-resin cores and luting-agent (P<.05). The mean baseline bond strength values ranged between 7.07 +/- 2.11 and 26.05 +/- 6.53 N. The highest bond strength of 26.05 +/- 6.53 N was obtained with Group 3. Group 5 showed the lowest value of bond strength. CONCLUSION. Appropriate surface treatment method should be applied to aged composite resin cores or aged-composites restorations should be replaced for The optimal bond strength and the clinical success.