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    Shear bond strength of three luting cements to two ceramic materials
    (TRANS TECH PUBLICATIONS LTD, 2004) Ozturk, B; Ozturk, N; Ovecoglu, HS; Ozer, F
    The aim of this study was to evaluate the shear bond strength of three different dual cure luting cements to two ceramic materials. Sixty cylindrical specimens (4mm in diameter) were prepared with Finesse Ceramco and Vita Omega 900. Specimens were randomly diveded into six groups of 10 specimen each. The luting cements (Panavia F; 3M ESPE Opal Luting Cement; Variolink H) were bonded to ceramic specimens using teflon tubes with an internal diameter of 2,97 nun and 2 mm in hight. Following thermocycling, the sepecimens were mounted in a spesific jig on the Universal Testing Machine and the luting cements debonded under a shear force at a crosshead speed of 0.5 mm/min. The bond strength was calculated in Mpa. The values of the shear bond strengths were analysed by using Two Way ANOVA, Kruskal-wallis of One Way ANOVA and Mann-Whitney U test. There were no statistically significant differences between the bond strength values of Finesse and Vita Omega 900 porcelains. Dual-cure cements (Panavia F and Variolink H) showed higher bond strength than light cure cement (3M ESPE Opal Luting cement).
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    Surface roughness and hardness of some dental ceramics and restorative resins
    (TRANS TECH PUBLICATIONS LTD, 2004) Karakaya, S; Unlu, N; Ovecoglu, HS; Ozer, F
    The aim of this study was to compare the surface hardness and roughness of seven composite resins AElite LS(AE), Clearfil Poto Posterior(CPP), SureFil (SF), Tetric Ceram (TC), Artglass (AG), Admira (AD), Estenia (ES)) and two ceramic materials (Vitadur Alfa (VA), Finesse(FI)). The composite speciemens were cured in cylindirical brass molds (4mm, in diameter and 2 mm in depth) against glass according to manufacturers' directions and polished. The ceramic specimens were prepared in same diameters, glazed. Hardness was determined at two different sites on one side specimens and the mean value was calculated as Vicker's Hardness Numbers (VHN). Surface roughness (SR) was measured tree times as Ra (mum) on each specimen and mean roughness values were obtained. For statistical analyses Mann Whitney U test was used. Surface roughness values of CPP, ES were very close to that of VA. Their surface roughness values were significantly higher than other materials. VHN of ES and AG were significantly lower than that of two ceramic materials. The surface hardness of ES was significantly harder than composite resins (P<0.05)