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ATAKÖK, GÜRCAN

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ATAKÖK

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GÜRCAN

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2009 - 200912010 - 20151
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    Experimental investigation of plastic injection molding: Assessment of the effects of cavity pressure and mold temperature on the quality of the final products
    (ELSEVIER SCI LTD, 2009) ATAKÖK, GÜRCAN; Kurt, Mustafa; Kamber, O. Saban; Kaynak, Yusuf; Atakok, Gurcan; Girit, Oguz
    Today more than ever, the molding industry demands better product quality. The quality of molded parts is crucial with regard to their functional capacity, and hence a great deal of attention should be directed towards maintaining consistent tolerances and overall dimensions. As the demand for high quality final parts continues to increase, the controlling parameters of cavity pressure and mold temperature become ever more significant in the plastic injection molding process. Therefore, in this research, cavity pressure and mold surface temperature have been measured and recorded by pressure and temperature-pressure sensors using a Kistler CoMo 2869A injection-type apparatus. The influences of the measured factors on the quality of the final parts have been investigated experimentally. The results of this experimental study indicate that cavity pressure and mold temperature are the dominant factors determining the quality of the final product in plastic injection molding. (C) 2009 Elsevier Ltd. All rights reserved.
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    Three-dimensional finite element analysis of shaping curved root canals with the ProTaper and HeroShaper systems
    (SPRINGER HEIDELBERG, 2015) MUTLU MİTİL, BİLÇEN; Mutlu, Bilcen; Kurt, Mustafa; Ekici, Bulent; Atakok, Gurcan
    In this study, we simulated the shaping of a curved root canal with the ProTaper and HeroShaper file systems using three-dimensional finite element modeling. A total of seven of the Ni-Ti rotary instruments were employed to investigate the influence of cutting geometry. A workflow was developed using the mechanical design and analysis software I-DEAS 11 and the LS-DYNA finite element package. The three-dimensional tooth model was constructed from a micro-computed tomography dental scan and a simulated canal. It was found that stresses concentrated towards the outer aspect of curvature in the apical portion of the canal when the ProTaper file system was employed. For the HeroShaper files, the stresses concentrated in the middle portion of the tooth model. Our simulated root canal procedure enables the efficacy of rotary NiTi instruments to be evaluated in a patient-specific setting. This may aid the dentist in choosing the optimal tool set and provides data for improving tool design.