Person: TUNCEL, İLKİN
Loading...
Status
Kurumdan Ayrılmıştır
Organizational Units
4 results
Search Results
Now showing 1 - 4 of 4
Publication Metadata only Bond strength of short-pulsed laser-irradiated zirconia to veneer ceramic(2015-06-01T00:00:00Z) Tuncel, Ilkin; TURP, IŞIL; Usumez, Aslihan; TUNCEL, İLKİN; TURP, IŞILObjective: The aim was to evaluate the effect of 1064nm Yb-doped fiber-based nanosecond pulsed laser on surface roughness and bond strength between veneer ceramic and zirconia. Material and methods: Zirconia discs were divided into three groups: sandblasted (SB), laser irradiated (YL), and control (n = 12). YL group was treated with ytterbium laser with the setting of 85W/25kHz. Sandblasting was done using 50 mu m Al2O3 particles from a distance of 10mm for 20s under 3.5atm. No surface treatment was applied to the control group. The surface roughness values and SEM images of the groups were obtained. X-ray diffraction analysis was applied to a spare sample of each group to determine the monoclinic phase ratio. The samples were subjected to shear bond strength (SBS) test with a cross-head speed of 1mm/min after being veneered. The fracture modes were evaluated. One-way analysis of variance and Tukey-s HSD tests were used for statistical analysis. Results: The YL group had higher surface roughness than the control (p <= 0.0001) and the SB group (p = 0.007) with a mean value of 2.90 mu m. The SEM images of the groups supported this result, but formation of the microcracks was more intense for the YL group. The monoclinic phase ratio was highest for the SB group. However, the differences of SBS between SB and YL groups were not statistically significant. Mostly the combined failure of samples was observed. Conclusions: Ytterbium laser treatment increased the surface roughness of zirconia, but the SBS was not higher than sandblasting. Surface roughness results did not correlate with the SBS results.Publication Metadata only The Effect of Luting Cement and Titanium Base on the Final Color of Zirconium Oxide Core Material(2017-02-01T00:00:00Z) ÇAPA, NURAY; TUNCEL, İLKİN; Tak, Onjen; Usumez, Aslihan; TUNCEL, İLKİNPurposeTo evaluate the effects of different types of luting cements and different colors of zirconium cores on the final color of the restoration that simulates implant-supported fixed partial dentures (FPDs) by using a titanium base on the bottom.Publication Metadata only Transmission of Er:YAG Laser Through Different Dental Ceramics(2014-01-01T00:00:00Z) Sari, Tugrul; TUNCEL, İLKİN; Usumez, Aslihan; Gutknecht, Norbert; TUNCEL, İLKİNObjective: The aim of this study was to determine the erbium-doped yttrium aluminum garnet (Er:YAG) laser transmission ratio through different dental ceramics with different thicknesses. Background data: Laser debonding procedure of adhesively luted all-ceramic restorations is based on the transmission of laser energy through the ceramic and the ablation of resin cement, because of the transmitted laser energy. Methods: Five different dental ceramics were evaluated in this study: sintered zirconium-oxide core ceramic, monolithic zirconium-oxide ceramic, feldspathic ceramic, leucite-reinforced glass ceramic, and lithium disilicate-reinforced glass ceramic. Two ceramic discs with different thicknesses (0.5 and 1mm) were fabricated for each group. Ceramic discs were placed between the sensor membrane of the laser power meter and the tip of the contact handpiece of an Er:YAG laser device with the aid of a custom- made acrylic holder. The transmission ratio of Er:YAG laser energy (500mJ, 2Hz, 1W, 1000s) through different ceramic discs was measured with the power meter. Ten measurements were made for each group and the results were analyzed with two way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) tests. Results: The highest transmission ratio was determined for lithium disilicate-reinforced ceramic with 0.5mm thickness (88%) and the lowest was determined for feldspathic ceramic with 1mm thickness (44%). The differences among the different ceramics and between the different thicknesses were significant (p<0.05). Conclusions: Ceramic type and thickness should be taken into consideration to adjust the laser irradiation parameters during laser debonding of adhesively luted all-ceramic restorations.Publication Metadata only The effect of coloring liquids on the translucency of zirconia framework(2013-11-01T00:00:00Z) TUNCEL, İLKİN; EROĞLU, Erdal; Sari, Tugrul; Usumez, Aslihan; TUNCEL, İLKİNPURPOSE. Translucency of all-ceramic restorations is an important factor which affects the final appearance and esthetic outcome of the restoration. The aim of this study was to evaluate the effect of the shade of coloring liquid on the translucency of zirconia framework. MATERIALS AND METHODS. Thirty zirconium oxide core plate (15 x 12 x 0.5 mm) were divided into 6 groups of 5 plates each. Each group was classified according to the shade of coloring liquid based on Vita Classic Scale (A2, A3, B1, C2, and D2), and each sample was immersed in coloring liquid for 3 seconds as recommended by the manufacturer, except for the control group. Contrast ratio, as a translucency parameter, was calculated using a spectrophotometer and the data were analyzed with one-way analysis of variance (ANOVA) and Tukey-s honestly significant differences (HSD) tests (alpha=.05). RESULTS. Significant differences in translucency among the control and test groups, and the B1 shaded group and other shades was observed. There were no significant differences among A2, A3, C2, and D2 shaded groups. CONCLUSION. The translucency of the zirconium oxide cores was affected by the coloring procedure and significant differences in the translucency measurements were identified between specific shades.