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    Comparison of the mechanical and biological properties of self-adhering materials
    (TAYLOR & FRANCIS LTD, 2016) Ulker, H. Esra; Erkan, Ali Ihsan; Gunaydin, Nuray; Kahvecioglu, Firdevs; Ulker, Mustafa
    Purpose: The purpose of the present study was to compare the Vickers hardness numbers (VHNs), roughness numbers (RNs) and biological compatibility of glass carbomer (Glass Fill), resin-modified glass ionomer (Fuji II LC) and self-adhering flowable composite (Vertise Flow) materials. Materials and methods: Disc-shaped specimens of test materials (n=15/group) were prepared, and VHNs and RNs were determined after 24h. A direct contact test was used for cytotoxicity evaluation. Cell viability was measured for 24h post-exposition with a photometric test (MTT assay; n=16). Data were analysed using one-way analysis of variance with a post hoc Tukey's test, the Kruskal-Wallis test and the Mann-Whitney U-test (p<0.05). Results: Fuji II LC had the highest VHN. The VHN of Fuji II LC differed significantly from those of the other materials (p<0.05). The RNs of Fuji II and Glass Fill were higher than that of Vertise Flow (p<0.05). The self-adhering materials were not significantly cytotoxic compared with the control group (p>0.05). Conclusions: The materials tested in this study showed a similar lack of cytotoxicity. The VHN of Fuji II LC was the highest, and the RN of Vertise Flow was the lowest.
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    Effect of new innovative restorative carbomised glass cement on intrapulpal temperature rise: an ex-vivo study
    (SOCIEDADE BRASILEIRA DE PESQUISA ODONTOLOGICA, 2016) Botsali, Murat Selim; Tokay, Ugur; Ozmen, Bilal; Cortcu, Murat; Koyuturk, Alp Erdin; Kahvecioglu, Firdevs
    This study aimed to evaluate the temperature changes that occurred in the pulp chamber when using GCP Glass Carbomer Fill (GCP) and two different resin-modified glass-ionomer (RGI) restorative materials at different dentin thicknesses. A standardized Class I occlusal cavity with 1 mm or 2 mm dentin thickness was prepared in the extracted human molar teeth. RGI and GCP fills were placed in the cavities and cured with two different light-curing units. This study included a total of 120 samples, with 20 samples in each group. The pulp microcirculation method was used for measuring the intrapulpal temperature changes. Statistical analysis was performed using the two-way ANOVA and Tukey HSD multiple comparison tests. Statistically significant differences were observed between 1 mm and 2 mm dentin thicknesses (p < 0.001). The GCP groups (both 1 mm and 2 mm dentin thicknesses) exhibited higher temperatures than the other groups (p < 0.001), and Fuji II LC and Photac Fil Quick Aplicap showed similar values (p > 0.05). The highest temperature changes were observed with 1 mm dentin thickness. While RGI materials in both dentin thicknesses did not cause temperature changes that were harmful to the pulp, GCP CarboLED LCU caused the highest intrapulpal temperature rise, and these values were borderline harmful to the dental pulp.
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    Intrapulpal Thermal Changes during Setting Reaction of Glass Carbomer (R) Using Thermocure Lamp
    (HINDAWI PUBLISHING CORP, 2016) Kahvecioglu, Firdevs; Tosun, Gul; Ulker, Hayriye Esra
    Objectives. Tomeasure the temperature increase induced during thermocure lamp setting reaction of glass carbomer and to compare it with those induced by visible light curing of a resin-modified glass ionomer and a polyacid-modified composite resin in primary and permanent teeth. Materials and Methods. Nonretentive class I cavities were prepared in extracted primary and permanent molars. Glass carbomer (GC) was placed in the cavity and set at 60 degrees C for 60 sn using a special thermocure lamp. Resin-modified glass ionomer (RMGIC) and polyacid-modified composite resin (PMCR) were placed in the cavities and polymerized with an LED curing unit. Temperature increases during setting reactions were measured with a J-type thermocouple wire connected to a data logger. Data were examined using two-way analysis of variance and Tukey's honestly significant difference tests. Results. The use of GC resulted in temperature changes of 5.17 +/- 0.92 degrees C and 5.32 +/- 0.90 degrees C in primary and permanent teeth, respectively (p > 0.05). Temperature increases were greatest in the GC group, differing significantly fromthose in the PMCR group (p < 0.05). Conclusion. Temperature increases during polymerization and setting reactions of the materials were below the critical value in all groups. No difference was observed between primary and permanent teeth, regardless of the material used.