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    An Investigation of the Metal Fatigue of Different Nickel-Titanium Rotary Instruments After Prolonged Use
    (Cumhuriyet University Faculty of Dentistry, 2022) Akpınar, Kerem Engin; Cengiz, Gizem Kutlu
    Objectives: This study aimed to compare the cyclic fatigue (CF) resistance of nickel-titanium (Ni-Ti) endodontic instruments from ProTaper (PTU), ProTaper Next (PTN), Wave One (WO), and Reciproc (RPC). Materials and Methods: In our study, PTU, PTN, WO, and RPC rotary files were divided into the experimental and control groups containing an equal number of samples. The experimental group files were used in the shaping of 80 extracted human lower premolar and lower molar teeth. The experimental and control group kits were then placed in the test apparatus and observed until they fractured. Fracture times were recorded and statistically evaluated. Results: In the one-to-one comparisons of the experimental and control group files, the differences between the fracture times of the experimental and control group files were found to be statistically insignificant in RPC, WO, PTU, and PTN X1 files, fracture time differences were statistically significant in all PTN X2 files. As a result of the pairwise comparison of the experimental and control groups, the difference between the experimental and control groups of the WO and RPC files used with reciprocal movement was found to be statistically insignificant. Conclusions: The files used with the reciprocal movement were found to be safer in terms of metal fatigue when compared to the other files used with rotational movement after the preparation. © This work is licensed under Creative Commons Attribution 4.0 International License
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    Micro-Computed Tomographic Evaluation of Dentinal Cracks Caused by Various Recent File Systems
    (Cumhuriyet University Faculty of Dentistry, 2022) Zan, Recai; Altunbaş, Demet; Hubbezoğlu, İhsan; Topçuoğlu, Hüseyin Sinan; Cengiz, Gizem Kutlu
    Objectives: The purpose of present study was to evaluate the incidence of dentinal micro-cracks observed after the use of ProTaper Gold (PTG), WaveOne Gold (WOG), OneShape New Generation (OSNG), K3XF nickel-titanium (NiTi) instrumentation systems. Materials and Methods: Sixty extracted human mandibular first molars were randomly assigned to four groups (n = 15). The root canals were instrumented with PTG, WOG, OSNG, and K3XF systems. The cross-sectional images of the roots were screened using high-resolution micro-computed tomography imaging before and after preparation to detect the presence of dentinal cracks. Results: Although there was no statistically significant difference between PTG and WOG systems, WOG caused lesser micro-crack among all groups. K3XF showed statistically fewer cracks than OSNG. K3XF and OSNG systems caused statistically more dentinal micro-cracks than both Gold systems. WOG and PTG systems caused lesser micro-cracks formation among the systems evaluated in present study. Conclusions: All used systems have caused different degrees of crack formations. Furthermore, WOG and PTG systems have shown superior features in terms of creating dentinal cracks according to OSNG, and K3XF systems. Preferring PTG and WOG systems during root canal shaping may minimize microcracks © This work is licensed under Creative Commons Attribution 4.0 International License