Srikumar G P V, Gadbail Vaishnavi, Alexander Arvind Kumar, Nishad Geeta, Rahane Shripriya, Beautlin J S
Department of Conservative Dentistry and Endodontics, Triveni Institute of Dental Sciences, Hospital and Research Centre, Bilaspur, Chhattisgarh, India.
Department of Conservative Dentistry and Endodontics, Rajas Dental College and Hospital, Tirunelveli, Tamil Nadu, India.
J Conserv Dent Endod. 2024 Jul;27(7):774-779. doi: 10.4103/JCDE.JCDE_2_24. Epub 2024 Jul 8.
Root canal instrumentation is one of the important procedures for successful endodontic therapy. Unexpected fracture of files occurs during root canal instrumentation without any visible signs of deformation compromising the success of root canal treatment.
The aim of the study was to evaluate and compare cyclic fatigue resistance (CFR) of rotary and reciprocating files in simulated canals with 45°, 60°, and 90° angle of curvature.
The study design was an study.
Sixty nickel-titanium files, 30 each of rotary and reciprocating files were selected and divided into four groups ( = 15) of Neoendo Flex, ProTaper Next, WaveOne Gold (WOG), and Reciproc Blue (RPB) files. Each group was further subdivided into three subgroups containing five samples each based on their use in simulated canals with 45°, 60°, and 90° angle of curvature. To simulate root canals with 45°, 60°, and 90° angle of curvature, three artificial canals were designed in a stainless steel metal block. Each file was autoclaved, immersed in 3% sodium hypochlorite (NaOCl), and coated with 17% ethylenediaminetetraacetic acid (EDTA). Each file was tested for CFR using a torque-controlled reduction handpiece by instrumenting in a simulated canal for 10 s until fracture. The cycle of autoclaving, exposure to NaOCl, EDTA, and testing of CFR for 10 s per canal as per groups and subgroups was repeated again and again until the respective file fracture. The time taken to file fracture was recorded using a digital chronometer. The time taken for each file fracture (in minutes) was multiplied by the number of rotations per minute to attain the number of cycles to failure (NCF).
The obtained results were subjected to statistical analysis using one-way analysis of variance and independent -test.
One-way ANOVA test showed a statistically significant difference between the four groups, < 0.001. Independent ""-test between individual subgroups showed a statistically significant difference, as < 0.05.
WOG and RPB reciprocating file systems showed superior CFR, more especially in canals with abrupt 90° angle of curvature compared to both rotary file systems tested. Among rotary file systems tested, Neoendo Flex showed greater CFR than ProTaper Next.
根管预备是成功进行牙髓治疗的重要步骤之一。在根管预备过程中，锉针会意外折断，且无任何可见的变形迹象，这会影响根管治疗的成功率。
本研究旨在评估和比较旋转锉与往复锉在模拟弯曲度为45°、60°和90°的根管中的抗循环疲劳能力（CFR）。
本研究设计为一项……研究。
选取60根镍钛锉，其中旋转锉和往复锉各30根，分为四组（每组n = 15），分别为Neoendo Flex锉、ProTaper Next锉、WaveOne Gold（WOG）锉和Reciproc Blue（RPB）锉。根据它们在模拟弯曲度为45°、60°和90°的根管中的使用情况，每组进一步细分为三个亚组，每个亚组包含五个样本。为模拟弯曲度为45°、60°和90°的根管，在不锈钢金属块中设计了三条人工根管。每根锉针均进行高压灭菌，浸入3%次氯酸钠（NaOCl）中，并涂覆17%乙二胺四乙酸（EDTA）。使用扭矩控制减速手机对每根锉针进行CFR测试，在模拟根管中预备10秒直至折断。按照组和亚组的情况，对根管进行高压灭菌、暴露于NaOCl、EDTA处理以及每次10秒的CFR测试的循环不断重复，直到相应的锉针折断。使用数字计时器记录锉针折断所需的时间。将每根锉针折断所需的时间（分钟）乘以每分钟的旋转次数，以获得失效循环次数（NCF）。
对所得结果进行单因素方差分析和独立……检验。
单因素方差分析显示四组之间存在统计学显著差异，P < 0.001。各亚组之间的独立……检验显示存在统计学显著差异，P < 0.05。
与所测试的两种旋转锉系统相比，WOG和RPB往复锉系统表现出更优的CFR，尤其是在弯曲度为90°的急弯根管中。在所测试的旋转锉系统中，Neoendo Flex的CFR高于ProTaper Next。
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