Department of General Surgery and Surgical-Medical Specialties, University of Catania, Catania, Italy.
MATIS, Institute of Microelectronics and Microsystems, National Research Council, Catania, Italy.
J Endod. 2018 Dec;44(12):1849-1855. doi: 10.1016/j.joen.2018.08.012. Epub 2018 Oct 25.
The purpose of this study was to compare the cyclic fatigue of Reciproc (REC; VDW, Munich, Germany) and Reciproc blue (REB, VDW) with different angles of file access.
The cyclic fatigue resistance of 120 new REC R25 and REB R25 (REB) files was tested. Instruments were divided into 8 groups on the basis of the access angle inside the artificial canal tested (n = 15): groups 1, 2, 3, and 4 included REC tested at 0°, 10°, 20°, and 30°, respectively, and groups 5, 6, 7, and 8 consisted of REB tested at 0°, 10°, 20°, and 30°, respectively. Resistance to cyclic fatigue was determined by recording the time to fracture in a stainless steel artificial canal with a 60° curvature and a 5-mm radius using a customized testing device. Data were analyzed using 2-way analysis of variance followed by the post hoc Tukey test with a significance level of 5%. The fracture surface of fragments was examined with a scanning electron microscope.
The cyclic fatigue of REC was reduced from each angle of insertion, whereas REB reduced its fatigue resistance when 20° or 30°access inclination was tested. REB exhibited higher cyclic fatigue than REC when the angle of file access was 0° and 10° (P < .05), whereas there was no difference between the instruments tested at 20°. REC had higher cyclic fatigue resistance than REB at 30° (P < .05).
REB files exhibited higher cyclic fatigue resistance than REC when the access to the canal was straight or with a limited inclination.
本研究旨在比较 Reciproc（REC；VDW，慕尼黑，德国）和 Reciproc blue（REB，VDW）在不同根管内插入角度下的疲劳寿命。
测试了 120 根新的 REC R25 和 REB R25（REB）锉的抗疲劳性能。根据测试的人工根管内的插入角度将器械分为 8 组（n=15）：1 组、2 组、3 组和 4 组分别为 0°、10°、20°和 30°的 REC 测试，5 组、6 组、7 组和 8 组分别为 0°、10°、20°和 30°的 REB 测试。使用定制的测试设备，通过记录在具有 60°曲率和 5mm 半径的不锈钢人工根管中发生断裂的时间来确定抗疲劳性能。使用双因素方差分析和随后的 Tukey 检验进行数据分析，显著性水平为 5%。用扫描电子显微镜检查碎片的断裂表面。
REC 的循环疲劳随着插入角度的增加而降低，而 REB 在测试 20°或 30°的插入倾斜角度时，其疲劳阻力降低。当根管的插入角度为 0°和 10°时，REB 的循环疲劳性能高于 REC（P<.05），而当插入角度为 20°时，两种器械之间没有差异。当插入角度为 30°时，REC 的循环疲劳阻力高于 REB（P<.05）。
当根管的进入方向是直的或倾斜角度有限时，REB 锉的抗疲劳性能高于 REC。
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