Akademik Veri Yönetim Sistemi
Ege Üniversitesi Diş Hekimliği Fakültesi, cilt.42, sa.3, ss.167-172, 2021 (TRDizin)
Current developments in restorative dentistry have been recorded theoretically and practically in recent years. Short and long term evaluation in the dental practice in consideration of the developments of conventional knowledge and current studies will ensure the continuity of scientific progress. Regular monitoring of old restorations is very important in terms of evaluating the materials and techniques used in dentistry. As a result of the evaluation of posterior direct composite restorations, it may be decided to repair, retreatment or solely follow the restoration. Correspondingly, the quality of treatment and patient satisfaction will increase. This review aims to make evaluations based on scientific criteria and to be expressed in a universal language. Objective: This study aimed to compare the cyclic fatigue resistance of Hyflex EDM and WaveOne Gold rotary instruments in simulated abrupt apical curvature at body temperature. Methods and Materials: A total of 10 Hyflex EDM OneFile (25/04-08) and 10 WaveOne Gold Primary (25/07) instruments free of visible defects were selected after inspection. Instruments were tested in an artificial canal having an angle of curvature of 90° and a radius of curvature of 2 mm. The instruments were rotated at speed and torque values recommended by manufacturers at 37°C until fracture occurred. Time required for fracture (TF) was recorded with a 1/100 s digital chronometer. The TF and fractured fragment length data were statistically analyzed using t-test with significance threshold of 5%. Results: The mean TF value was 98.40 ± 19.93 seconds for WaveOne Gold group and 183.50 ± 35.33 seconds for Hyflex EDM group. Hyflex EDM OneFile instruments fractured in a longer time period than WaveOne Gold instruments and the difference between them was statistically significant (p<0.05). Conclusion: Hyflex EDM OneFile instruments, which are produced with electric discharge machining, were found to be more resistant to cyclic fatigue than WaveOne Gold instruments.