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首页> 美国卫生研究院文献>Materials >Advancement of Mechanical Properties of Nickel-Titanium Rotary Endodontic Instruments by Spring Machining on the File Shaft
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Advancement of Mechanical Properties of Nickel-Titanium Rotary Endodontic Instruments by Spring Machining on the File Shaft

机译：锉轴钢型钛旋转牙髓仪器力学性能的推进

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Nickel-titanium (NiTi) endodontic rotary instruments are used extensively in root canal procedures by both general dentists and specialists. However, their vulnerability to fracture is the major reason for clinicians’ concern regarding their use. The objective of this study was to investigate the potential effects of spring machining of the file shaft on the fatigue and torsional resistances of NiTi rotary instruments. Three types of NiTi rotary systems with (S) and without (NS) spring machining were used in this study (n = 15 each): a spring file (SPR; #25/.06, SPR-S, SPR-NS), a ProTaper Next X2 (PTN; #25/variable taper, PTN-S, PTN-NS), and a ProTaper Gold F2 (PTG; #25/variable taper, PTG-S, PTG-NS). Spring machining was adjusted on the 6 mm of each file system’s shaft via a laser cutting process. The number of rotation cycles until fracture (i.e., cyclic fatigue resistance), ultimate torsional strength, the distortion angle, and the toughness of each subgroup were estimated with specially designed devices. The results were analyzed using a paired t-test at a significance level of 95%. NiTi rotary instruments with spring machining exhibited a higher cyclic fatigue resistance than instruments without spring machining. The groups with spring machining exhibited a higher toughness and larger distortion angle than the groups without it (p < 0.05). In conclusion, spring machining on the shank of NiTi instruments may provide a stress-bearing area and attenuate the torsional and cyclic fatigue of NiTi rotary instruments.
机译：镍 - 钛（NITI）牙髓旋转仪器通过一般牙医和专家广泛使用根管手术。然而，他们对骨折的脆弱性是临床医生对其使用令的主要原因。本研究的目的是研究文件轴弹簧加工对NITI旋转仪器的疲劳和扭转电阻的潜在影响。本研究中使用了三种类型的NITI旋转系统，具有（S）和没有（NS）弹簧加工（每个）：弹簧文件（SPR;＃25 / .06，SPR-S，SPR-NS）， protaper下一个x2（ptn;＃25 /可变锥度，ptn-s，ptn-ns）和propaper gold f2（ptg;＃25 /可变锥度，ptg-s，ptg-ns）。通过激光切割工艺在每个文件系统轴的6毫米上调节弹簧加工。用专门设计的装置估计了旋转循环的旋转循环次数，直到裂缝（即循环疲劳电阻），极限扭转强度，变形角度和每个子组的韧性。使用成对的T检验分析结果，其显着性水平为95％。 NITI带簧加工的旋转仪器呈现出比没有弹簧加工的仪器更高的循环疲劳电阻。具有弹簧加工的组具有比没有它的较高的韧性和更大的变形角（P <0.05）。总之，NITI仪器柄上的弹簧加工可以提供应力轴承区域，并衰减NITI旋转仪器的扭转和循环疲劳。

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