Vol. 2 (2021): Journal of Medical and Dental Investigations

DOI: https://doi.org/10.5577/jomdi.vol2.2021

Published: 01.01.2021

Original Article

Comparative evaluation of sterilization- and temperature-dependent cyclic fatigue resistance of four different nickel-titanium rotary file systems with reciprocal motion

Aim: The aim of this study was to examine the effect of sterilization and temperature differences on the cyclic fatigue resistance of WaveOne Gold, Reciproc, Reciproc Blue, and Twisted File Adaptive rotary file systems. Methods: In total, 160 files and four file systems were used (n = 20). This study was carried out at two different temperatures: 20°C and 39°C. An artificial stainless-steel canal was used for the static cyclic fatigue test. The breaking times of the files were recorded and calculated by multiplying the number of revolutions by the rotational speed. The SPSS 22 program was used for statistical analysis. The Shapiro–Wilk test was used for data with a normal distribution. The Mann–Whitney U test was used for paired groups. The Kruskal–Wallis test was applied to groups with more than two variables where the data did not fit a normal distribution. Tukey’s post-hoc analysis was used to determine the source of differences. A value of p<0.05 was considered statistically significant. Results: When the lengths of the broken pieces and the numbers of breaks were compared at the two different temperatures, there was a significant difference between all the files. In addition, there was a significant between-group difference between the sterilized files and nonsterilized files (p < 0.05). Conclusion: The cyclic fatigue resistance of the Reciproc Blue file was higher than that of the other files. Low temperature increased cyclic fatigue resistance. How to cite this article: Çelikel B, Öztekin F. Comparative evaluation of sterilization and temperature-dependent cyclic fatigue resistance of four different nickel-titanium rotary file systems with reciprocal movement. J Med Dent Invest 2021;2:e211038 https://doi.org/10.5577/jomdi.e211038 Linguistic revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English. Checked for plagiarism: Yes

Cyclic fatigue, fracture resistance, NiTi file, sterilization, reciprocal motion

Bayram Çelikel, Faruk Öztekin
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Abstract Views: 606 Download: 495 10.5577/jomdi.e211038
Comparison of second mesiobuccal canal prevalence of maxillary molar teeth by gender and age in a Turkish subpopulation: A cone-beam computed tomography study

Aim: The purpose of this study is to examine the distribution of second mesiobuccal (MB2) canal frequency according to age and gender in the maxillary molars of individuals in South-eastern Anatolia, Turkey, using cone-beam computed tomography (CBCT). It also seeks to inform dentists who perform root canal treatments about the prevalence of additional canals that affect the success of treatments. Methods: 300 patients who had already had CBCT images taken were grouped by gender and age. A total of 1,034 maxillary molar teeth were evaluated in the axial section. The chi-square test was used to evaluate the morphological differences between different age groups and genders. Results: The total frequency of MB2 canals was found to be 44.4% in 300 people (42.5% in women; 47.2% in men). In addition, the frequency of MB2 canals was 59.2% (n = 506) in maxillary first molars and 30.4% (n = 528) in maxillary second molars. On the basis of the right and left jaws, the incidence of MB2 canals was 44.2% in the right jaw and 44.9% in the left jaw. No statistically significant differences were found between gender and age. Conclusion: It is concluded that using CBCT will increase the detection of the presence of additional canals, increasing dentists’ success rates in performing root canal treatments. Furthermore, it has been observed that using new technologies and spending more time in the detection of MB2 canals will increase the success of root canal treatments in maxillary molar teeth. How to cite this article: Akay A, Öz H, Adıgüzel Ö, Erkan Akay S. Comparison of second mesiobuccal canal prevalence of maxillary molar teeth by gender and age in a Turkish subpopulation: A cone-beam computed tomography study. J Med Dent Invest 2021;2:e211062. https://doi.org/10.5577/jomdi.e211062

Cone-beam computed tomography, MB2, maxillary molar, root canal anatomy, prevalence

Ahmet Akay, Hasan Öz, Özkan Adıgüzel, Seda Erkan Akay
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Abstract Views: 1080 Download: 303 10.5577/jomdi.e211062

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Vol. 2 (2021): Journal of Medical and Dental Investigations

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