热处理对不同旋转镍钛器械抗疲劳性能的影响
Impact of heat treatments on the fatigue resistance of different rotary nickel-titanium instruments.
作者信息
Braga Lígia Carolina Moreira, Faria Silva Ana Cristina, Buono Vicente Tadeu Lopes, de Azevedo Bahia Maria Guiomar
机构信息
Department of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil.
Department of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil.
出版信息
J Endod. 2014 Sep;40(9):1494-7. doi: 10.1016/j.joen.2014.03.007. Epub 2014 Apr 29.
INTRODUCTION
The aim of this study was to assess the influence of M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK) and controlled memory technologies on the fatigue resistance of rotary nickel-titanium (NiTi) files by comparing files made using these 2 technologies with conventional NiTi files.
METHODS
Files with a similar cross-sectional design and diameter were chosen for the study: new 30/.06 files of the EndoWave (EW; J. Morita Corp, Osaka, Japan), HyFlex (HF; Coltene/Whaledent, Inc, Cuyahoga Falls, OH), ProFile Vortex (PV; Dentsply Tulsa Dental Specialties, Tulsa, OK), and Typhoon (TYP; Clinician's Choice Dental Products, New Milford, CT) systems together with ProTaper Universal F2 instruments (PTU F2; Dentsply Maillefer, Ballaigues, Switzerland). The compositions and transformation temperatures of the instruments were analyzed using x-ray energy-dispersive spectroscopy and differential scanning calorimetry, whereas the mean file diameter values at 3 mm from the tip (D3) were measured using image analysis software. The average number of cycles to failure was determined using a fatigue test device.
RESULTS
X-ray energy-dispersive spectroscopy analysis showed that, on average, all the instruments exhibited the same chemical composition, namely, 51% Ni-49% Ti. The PV, TYP, and HF files exhibited increased transformation temperatures. The PTU F2, PV, and TYP files had similar D3 values, which were less than those of the EW and HF files. The average number of cycles to failure values were 150% higher for the TYP files compared with the PV files and 390% higher for the HF files compared with the EW files.
CONCLUSIONS
M-Wire and controlled memory technologies increase the fatigue resistance of rotary NiTi files.
引言
本研究的目的是通过将使用这两种技术制作的锉与传统镍钛锉进行比较，评估M-Wire（登士柏 Tulsa 牙科专业公司，塔尔萨，俄克拉荷马州）和可控记忆技术对旋转镍钛（NiTi）锉抗疲劳性能的影响。
方法
选择具有相似横截面设计和直径的锉进行研究：EndoWave（EW；日本森田公司，大阪）、HyFlex（HF；科天恩/伟瓦登特公司，俄亥俄州库亚霍加福尔斯）、ProFile Vortex（PV；登士柏 Tulsa 牙科专业公司，塔尔萨，俄克拉荷马州）和台风（TYP；临床医生选择牙科产品公司，康涅狄格州新米尔福德）系统的新型 30/.06 锉，以及 ProTaper Universal F2 器械（PTU F2；登士柏迈耶弗公司，瑞士巴莱格）。使用 X 射线能量色散光谱和差示扫描量热法分析器械的成分和转变温度，而使用图像分析软件测量距尖端 3 mm 处的平均锉直径值（D3）。使用疲劳测试装置确定平均失效循环次数。
结果
X 射线能量色散光谱分析表明，平均而言，所有器械均表现出相同的化学成分，即 51%镍 - 49%钛。PV、TYP 和 HF 锉的转变温度升高。PTU F2、PV 和 TYP 锉的 D3 值相似，均小于 EW 和 HF 锉。与 PV 锉相比，TYP 锉的平均失效循环次数值高 150%，与 EW 锉相比，HF 锉的平均失效循环次数值高 390%。
结论
M-Wire 和可控记忆技术提高了旋转 NiTi 锉的抗疲劳性能。
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