Effect of Environment on Fatigue Failure of Controlled Memory Wire Nickel-Titanium Rotary Instruments
Effect of Environment on Fatigue Failure of Controlled Memory Wire Nickel-Titanium Rotary Instruments
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DOI：
10.1016/j.joen.2011.12.002
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发表时间：
2012-03-01
影响因子：
4.2
通讯作者：
Haapasalo, Markus
中科院分区：
文献类型：
--
作者：
Shen, Ya;Qian, Wei;Haapasalo, Markus
简介：本研究检查了由新型可控记忆镍钛丝（CM丝）制成的2种镍钛（NiTi）器械在各种环境条件下的疲劳行为。研究方法：Pro File的三种常规超弹性NiTi器械（Dentsply Maillefer，Ballaigues，Switzerland），台风（临床医生选择牙科产品，新米尔福德，CT）和DS-SS 0250425 NEYY（Clinician's Choice Dental Products）和Typhoon CM和DS-SS 0250425 NEYY CM的2种新CM钢丝器械在空气、去离子水、17%EDTA或去离子水，在6%次氯酸钠中浸泡25分钟后，记录断裂转数（Ni）。通过扫描电子显微镜检查所有碎片的断裂表面。记录了裂纹的萌生位置和韧窝面积占整个断裂截面的百分比。结果如下：两种新的CM Wire器械在各种环境下的Nf比相同设计的传统NiTi锉提高>4 ~ 9倍（P
Introduction: This study examined the fatigue behavior of 2 types of nickel-titanium (NiTi) instruments made from a novel controlled memory NiTi wire (CM wire) under various environment conditions. Methods: Three conventional superelastic NiTi instruments of Pro File (Dentsply Maillefer, Ballaigues, Switzerland), Typhoon (Clinician's Choice Dental Products, New Milford, CT), and DS-SS0250425NEYY (Clinician's Choice Dental Products) and 2 new CM wire instruments of Typhoon CM and DS-SS0250425NEYY CM were subjected to rotational bending at the curvature of 35 in air, deionized water, 17% EDTA, or deionized water after immersion in 6% sodium hypochlorite for 25 minutes, and the number of revolutions of fracture (Ni) was recorded. The fracture surface of all fragments was examined by a scanning electron microscope. The crack-initiation sites and the percentage of dimple area to the whole fracture cross-section were noted. Results: Two new CM Wire instruments yielded an improvement of >4 to 9 times in Nf than conventional NiTi files with the same design under various environments (P