深低温干燥处理对三种旋转镍钛器械切割效率影响的体外评估
An in vitro evaluation of the effect of deep dry cryotreatment on the cutting efficiency of three rotary nickel titanium instruments.
作者信息
George Gingu Koshy, Sanjeev Kavitha, Sekar Mahalaxmi
机构信息
Department of Conservative Dentistry and Endodontics, Pushpagiri Dental College, Thiruvalla, India.
出版信息
J Conserv Dent. 2011 Apr;14(2):169-72. doi: 10.4103/0972-0707.82627.
CONTEXT
Cryogenic methods have been used to increase the strength of metals.
AIM
The aim of this study was to evaluate the effect of deep dry cryotherapy on the cyclic fatigue resistance of rotary nickel titanium instruments.
MATERIALS AND METHODS
Twenty K3, RaCe and Hero Shaper nickel titanium instruments, size 25, 0.06 taper, were taken for this study. Ten files were untreated (control group) and 10 files were deep dry cryogenically treated. Both the untreated and cryotreated files were subjected to cyclic fatigue evaluation. Cyclic fatigue was evaluated as the number of cycles it took for fracture of the instrument within a stainless steel shaping block of specific radius and angle of curvature.
STATISTICAL ANALYSIS
Mean values were compared between different study groups by using one-way analysis of variance (ANOVA) with P < 0.05 considered as the level of significance.
RESULTS
The results showed a significant increase in the resistance to cyclic fatigue of deep dry cryotreated NiTi files over untreated files.
CONCLUSIONS
It may thus be concluded that deep cryotherapy has improved the cyclic fatigue of NiTi rotary endodontic files.
背景
低温方法已被用于提高金属强度。
目的
本研究旨在评估深度干式冷冻疗法对旋转镍钛器械循环疲劳抗力的影响。
材料与方法
本研究选取了20支K3、RaCe和Hero Shaper镍钛器械，型号为25，锥度0.06。10支锉未作处理（对照组），10支锉进行深度干式冷冻处理。未处理和经冷冻处理的锉均进行循环疲劳评估。循环疲劳评估为器械在特定半径和曲率角度的不锈钢成型块内折断所需的循环次数。
统计分析
采用单因素方差分析（ANOVA）比较不同研究组之间的平均值，P<0.05被视为显著性水平。
结果
结果显示，深度干式冷冻处理的镍钛锉比未处理的锉对循环疲劳的抗力显著增加。
结论
因此可以得出结论，深度冷冻疗法改善了镍钛旋转根管锉的循环疲劳性能。
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