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Effects of metal surface grinding at the porcelain try-in stage of fixed dental prostheses
Kilinc, Halil Ibrahim,Kesim, Bulent,Gumus, Hasan Onder,Dincel, Mehmet,Erkaya, Selcuk The Korean Academy of Prosthodonitics 2014 The Journal of Advanced Prosthodontics Vol.6 No.4
PURPOSE. This study was to evaluate the effect of grinding of the inner metal surface during the porcelain try-in stage on metal-porcelain bonding considering the maximum temperature and the vibration of samples. MATERIALS AND METHODS. Ninety-one square prism-shaped ($1{\times}1{\times}1.5mm$) nickel-chrome cast frameworks 0.3 mm thick were prepared. Porcelain was applied on two opposite outer axial surfaces of the frameworks. The grinding was performed from the opposite axial sides of the inner metal surfaces with a low-speed handpiece with two types of burs (diamond, tungsten-carbide) under three grinding forces (3.5 N, 7 N, 14 N) and at two durations (5 seconds, 10 seconds). The shear bond strength (SBS) test was performed with universal testing machine. Statistical analyzes were performed at 5% significance level. RESULTS. The samples subjected to grinding under 3.5 N showed higher SBS values than those exposed to grinding under 7 N and 14 N (P<.05). SBS values of none of the groups differed from those of the control group (P>.05). The types of bur (P=.965) and the duration (P=.679) did not affect the SBS values. On the other hand, type of bur, force applied, and duration of the grinding affected the maximum temperatures of the samples, whereas the maximum vibration was affected only by the type of bur (P<.05). CONCLUSION. Grinding the inner metal surface did not affect the metal-porcelain bond strength. Although the grinding affected the maximum temperature and the vibration values of the samples, these did not influence the bonding strength.
Foreign Direct Investment; Firm heterogeneity; Free Trade Agreement
Zubeyir KILINC,Merve Mavus KUTUK,Arif ODUNCU 한국무역학회 2015 Journal of Korea trade Vol.19 No.2
The trade volume and diversity of the products traded between Korea and Turkey
Korea and Turkey Free Trade Agreement : A Qualitative and Quantitative Assessment
Zubeyir KILINC,Merve Mavus KUTUK,Arif ODUNCU 한국무역학회 2015 Journal of Korea trade Vol.19 No.2
The trade volume and diversity of the products traded between Korea and Turkey has been increasing since the early 2000s. On top of this, the enthusiasm of the countries in exploring new opportunities led them to start negotiations on signing a free trade agreement in 2010. The process was finalized in 2012. The agreement requires that all trade tariffs on industrial products and most of the tariffs on agricultural products will be removed in seven and ten years, respectively. To the best of our knowledge, this study is the first one that investigates possible economic impacts of this agreement on the Korean and Turkish economies. It employs a computable general equilibrium model and uses the Global Trade Analysis Project database. It finds that the agreement will benefit both parties in terms of GDP and exports. In particular, total gains of Korea and Turkey will be as high as 0.129 and 0.054 percent of their respective GDPs. Finally, the exports of Korea might increase up to 0.139 percent whereas that of Turkey might increase by 0.164 percent.
Leyla Kilinc,Yesim Hulya Uz 대한생식의학회 2021 Clinical and Experimental Reproductive Medicine Vol.48 No.3
Objective: Methotrexate (MTX), is a commonly used chemotherapeutic agent. This study aimed to investigate the possibility that curcumin (CMN) protects against MTX-induced testicular damage by affecting the phospho (p)-p38 mitogen-activated protein kinase (MAPK) and nuclear factor-kappa B (NF-kB) signaling pathways. Methods: Male Wistar albino rats were subdivided into three groups. The control group was given an intragastric (ig) administration of dimethyl sulfoxide (DMSO) daily for 14 days, the MTX group was given a single intraperitoneal (ip) dose of MTX (20 mg/kg) on the 11th day, and the MTX+CMN group was given ig CMN (100 mg/kg/day, dissolved in DMSO) for 14 days and a single ip dose of MTX (20 mg/kg) on the 11th day. Results: The animal weights, the seminiferous tubule diameter, and germinal epithelium height significantly decreased in the MTX group compared to the control group. The testes weight and the ratio of the testes to body weight did not change, whereas the number of seminiferous tubules and the interstitial space width increased significantly in the MTX group. The number of phospho-p38 (p-p38) MAPK immunopositive cells and the immunoreactivity of NF-kB also increased in the MTX group compared to the control group. Conclusion: CMN prevented the MTX-induced decreases in the body weight, seminiferous tubule diameter, and the germinal epithelium height, while significantly reducing the number of histologically damaged seminiferous tubules and the interstitial space width changes due to MTX. CMN also reduced the number of p-p38 MAPK immunopositive cells and the NF-kB immunoreactivity.
Shear bond strengths of aged and non-aged CAD/CAM materials after different surface treatments
Hamiyet Kilinc,Fatma Ayse Sanal,Sedanur Turgut 대한치과보철학회 2020 The Journal of Advanced Prosthodontics Vol.12 No.5
PURPOSE. To assess shear bond strengths (SBS) of resin composites on aged and non-aged prosthetic materials with various surface treatments. MATERIALS AND METHODS. Cerasmart (CE), Vita Enamic (VE), Vita Mark II (VM), and IPS e.max CAD (EC) blocks were sliced, and rectangular-shaped specimens (14 × 12 × 1.5 mm; N = 352) were obtained. Half of the specimens were aged (5000 thermal cycles) for each material. Non-aged and aged specimens were divided into 4 groups according to the surface treatments (control, air abrasion, etching, and laser irradiation; n = 11) and processed for scanning electron microscopy (SEM). The repair procedure was performed after the surface treatments. SBS values and failure types were determined. Obtained data were statistically analyzed (P≤.05). RESULTS. The material type, surface treatment type, and their interactions were found significant with regard to SBS (P<.001). Aging also had a significant effect on prosthetic material-resin composite bonding (P<.001). SBS values of non-aged specimens ranged from 12.16 to 17.91 MPa, while SBS values of aged specimens ranged from 9.46 to 15.61 MPa. Non-aged VM in combination with acid etching presented the highest score while the control group of aged CE showed the lowest. CONCLUSION. Etching was more effective in achieving durable SBS for VM and EC. Laser irradiation could be considered as an alternative surface treatment method to air abrasion for all tested materials. Aging had significant effect on SBS values generated between tested materials and resin composite.
An Attempt to Model Distributions of Machined Component Dimensions in Production
Cogun, Can,Kilinc, Biinyamin The Korean Society of Mechanical Engineers 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.1
In this study, normal, log-normal, triangular, uniform. Weibull, Erlang and unit beta probability density functions are tried to represent the behaviour of frequency distributions of workpiece dimensions collected from various manufacturing firms. Among the distribution functions, the unit beta distribution function is found to be the best fit using the chi-square test of fit. An attempt is made for the adoption of the unit beta model to x-bar charts of quality control in manufacturing. In this direction, upper and lower control limits (UCL and LCL) of x-bar control charts of dimension measurements are estimated for the beta model, and the observed differences between the beta and normal model control limits are discussed for the measurement sets.