Person: TURP, IŞIL
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Publication Effects of coloring procedures on shear bond strength between resin cement and colored zirconia.(2018-09-01) TUNCEL, İLKİN; Turp, IŞIL; TUNCEL, İLKİN; TURP, IŞILZirconia has a high fracture strength of more than 1000 MPa, fracture resistance of higher than 2000 N, and fracture toughness of 9–10 MN/m3/2 (1). In addition to these favorable mechanical properties, it is chemically durable (2), biocompatible (3, 4), and displays esthetic advantages (5) over metal-ceramic restorations. However, recent clinical trials have shown that zirconia-based ceramic restorations’ decementation is a common failure. Restoration’s cementation corresponds to restoration durability, and cementation is also an important factor for marginal fit and fracture strength of restorations (6, 7). There are various cementation options for zirconia framework restorations. Cementation of zirconia restorations with traditional luting cements (such as glass ionomer or zinc phosphate cements) provides adequate clinical fixation, but adhesive cementation may be preferred for better retention and marginal adaptation (7-10). In addition, resin cement shows higher compressive and tensile strength than other luting agents, and allows color selection for more esthetic restorations (11, 12).Publication Bilirkişilik raporu(2018-12-01) TURP, IŞIL; TURP, IŞILPublication 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 Evaluation of translucency of monolithic zirconia and framework zirconia materials.(2016-06-01) TUNCEL, İLKİN; Turp, IŞIL; USUMEZ, A; TUNCEL, İLKİN; TURP, IŞILPURPOSE. The opacity of zirconia is an esthetic disadvantage that hinders achieving natural and shade-matched restorations. The aim of this study was to evaluate the translucency of non-colored and colored framework zirconia and monolithic zirconia. MATERIALS AND METHODS. The three groups tested were: non-colored framework zirconia, colored framework zirconia with the A3 shade according to Vita Classic Scale, and monolithic zirconia (n=5). The specimens were fabricated in the dimensions of 15×12×0.5 mm. A spectrophotometer was used to measure the contrast ratio, which is indicative of translucency. Three measurements were made to obtain the contrast ratios of the materials over a white background (L*w) and a black background (L*b). The data were analyzed using the one-way analysis of variance and Tukey HSD tests. One specimen from each group was chosen for scanning electron microscope analysis. The determined areas of the SEM images were divided by the number of grains in order to calculate the mean grain size. RESULTS. Statistically significant differences were observed among all groups (P<.05). Non-colored zirconia had the highest translucency with a contrast ratio of 0.75, while monolithic zirconia had the lowest translucency with a contrast ratio of 0.8. The mean grain sizes of the noncolored, colored, and monolithic zirconia were 233, 256, and 361 nm, respectively. CONCLUSION. The translucency of the zirconia was affected by the coloring procedure and the grain size. Although monolithic zirconia may not be the best esthetic material for the anterior region, it may serve as an alternative in the posterior region for the bilayered zirconia restorations. [J Adv Prosthodont 2016;8:181-6]Publication Farklı İçerik ve Kalınlıktaki Tam Seramik Restorasyonların Translusentlik Değerlerinin Karşılaştırılması(2017-10-01) TUNCEL, İLKİN; TURP, IŞIL; TUNCEL, İLKİN; TURP, IŞILPublication Effect of Viscosity of Intermedium on the Retention of Double Crowns(2021-11-06) Turp I.; Çalık K.; TURP, IŞILPublication Residual monomer elution after light-activation of dual-cured resin cement under the indirect restoration materials(2017-05-05) TEKKELİ, ŞERİFE EVRİM; KURT, AYŞEGÜL; TURP, IŞIL; KIZILTAŞ, Mustafa Volkan; TURP, IŞIL; TEKKELİ, ŞERİFE EVRİMPublication Metal-Seramik Restorasyonlarda Fırınlama Sayısı ve Seramik Kalınlığının Renk Değişimine Etkisi(2017-12-01) TUNCEL, İLKİN; TURP, IŞIL; DÜÇ, Buğra; SELÇUKER, Ahmet Hamdi; ASLANTAŞ, Akif; BEKMAN, Enes; TUNCEL, İLKİN; TURP, IŞILPublication Stress distribution of four implant supported overdentures with tilted standard-sized implants and mini implants(2024-01-01) TURP I.; TURP V.; Tuncel İ.; Üşümez A.; TURP, IŞILPurpose The goal of the current study is to evaluate the stress distribution when tilted implants and mini-implants are used to support a mandibular overdenture. Materials and Methods Three-dimensional (3D) finite element models of mandibular overdentures were established using four, axial, standard-sized implants (SA model), four standard-sized implants with the mesial ones axial and the distal ones tilted (ST model) and four mini-implants (MA model) with Locator attachments. On each model, a 100 N load was applied to the overdenture in four different directions; bilateral vertical, unilateral vertical and oblique load on the posterior region, and a vertical load on the incisors. The stresses distributed at the peri-implant bone, implants, the prosthetic components, and the overdentures were evaluated. Results Non-axial posterior loading caused higher stress values in the implant and the prosthetic component than axial posterior loading. Lower stress values of the implant and the prosthetic component were observed in the ST model than SA model. The stress distribution in the overdenture at posterior loads were mostly observed around the implants. Conclusion Less prosthetic complications may be expected when the treatment option in the ST model is used. Fatigue fractures may occur around the implants in the overdentures, precautions are advised.Publication Evaluation of strain distribution on an edentulous mandible generated by cobalt-chromium metal alloy fixed complete dentures fabricated with different techniques: An in vitro study.(2019-07-01T00:00:00Z) Taşın, S; Turp, IŞIL; Bozdağ, E; Sünbüloğlu, E; Üşümez, A; TURP, IŞIL