Phase transformation behaviour and bending property of twisted nickel-titanium endodontic instruments
Phase transformation behaviour and bending property of twisted nickel-titanium endodontic instruments
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DOI：
10.1111/j.1365-2591.2010.01818.x
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发表时间：
2011-03-01
影响因子：
5
通讯作者：
Suda, H.
中科院分区：
文献类型：
--
作者：
Hou, X. M.;Yahata, Y.;Suda, H.
目的研究扭转法制备的镍钛根管器械相变行为与弯曲性能的关系。方法研究了Twisted Files （TF; SybronEndo, Orange， CA， USA）和K3 （SybronEndo）的相变行为和弯曲性能。研究了06锥度和30尺寸的尖端。以K3为对照组。用差示扫描量热法（DSC）估计了相变行为。根据DSC曲线计算相变温度。仪器的弯曲载荷采用37℃悬臂弯曲试验测量，数据采用Student's t检验和Mann-Whitney u检验分析。结果TF的相变温度显著高于K3 （P < 0.05）。在弹性和超弹性范围内，TF的弯曲载荷值均显著低于K3 （P < 0.05）。结论采用扭转加热处理的方法制备NiTi仪器，提高了相变温度，提高了材料的柔韧性。
P>AimTo investigate the relationship between phase transformation behaviour and bending property of nickel-titanium endodontic instruments manufactured by a twisting process.MethodologyThe phase transformation behaviour and bending property of Twisted Files (TF; SybronEndo, Orange, CA, USA) and K3 (SybronEndo) with.06 taper and size 30 tip were investigated. K3 was used as control group. Phase transformation behaviour was estimated by differential scanning calorimetry (DSC). Transformation temperatures were calculated from the DSC curve. Bending load of the instruments was measured by cantilever-bending test at 37 degrees C. Data were analysed by Student's t-test and Mann-Whitney U-test.ResultsThe phase transformation temperatures of TF were significantly higher (P < 0.05) than those of K3. The bending load values were significantly lower for TF than that of K3 (P < 0.05), both in the elastic and super-elastic ranges.ConclusionsThe new method of manufacturing NiTi instruments by twisting coupled with heat treatment might contribute to the increased phase transformation temperatures and superior flexibility.