Effect From Surface Treatment of Nickel-Titanium Rotary Files on the Fracture Resistance

被引:2
作者
Kim, Bo Hoon [1 ]
Ha, Jung-Hong [2 ]
Lee, Woo Cheol [3 ]
Kwak, Sang-Won [1 ]
Kim, Hyeon-Cheol [1 ]
机构
[1] Pusan Natl Univ, Sch Dent, Dept Conservat Dent, Dent Res Inst, Yangsan 626787, Gyeongnam, South Korea
[2] Kyungpook Natl Univ, Sch Dent, Dept Conservat Dent, Taegu, South Korea
[3] Seoul Natl Univ, Dent Res Inst, Sch Dent, Dept Conservat Dent, Seoul, South Korea
关键词
electro-polishing; fatigue resistance; nickel-titanium rotary file; surface treatment; torsional fracture; CYCLIC FATIGUE RESISTANCE; TORSIONAL RESISTANCE; ENDODONTIC INSTRUMENTS; CANAL PREPARATIONS; STAINLESS-STEEL; ENGINE-DRIVEN; CLINICAL-USE; HAND; BEHAVIOR;
D O I
10.1002/sca.21182
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
This study was aimed to compare the cyclic fatigue resistance and torsional resistance of rotary instruments with and without surface treatment. G6 A2 (Group A2) with and G6 A2 without surface treatment after machining (Group AN) were compared in this study. ProTaper F2 (Group F2) which has similar dimension and shape was also used for comparison. To evaluate the torsional resistance, ultimate torsional strength and distortion angle until fracture were recorded, and the toughness was calculated. The cyclic fatigue resistance was compared by evaluating the number of cycles to failure in a simulated canal. Statistical analysis was performed by one-way analysis of variance and Tukey post hoc test (p=0.05). After torsional and cyclic fatigue tests, all fracture fragments were observed under a scanning electron microscope. Group A2 showed higher cyclic fatigue resistance than the groups AN and F2 (p<0.05). Although group A2 demonstrated lower ultimate torsional strength than the others, there were no significant differences in toughness among the groups. While obvious machining grooves were seen in groups AN and F2, group A2 showed smooth surface resulting from the surface treatment. The specimens of fracture fragments showed typical features of cyclic failure such as micro-cracks, overloaded fast fracture zone, and torsional fracture such as unwinding helix, circular abrasion marks and dimples. Under the conditions of this study, the surface treated instruments may improve cyclic fatigue resistance while maintaining the torsional resistances and mechanical properties. SCANNING 37:82-87, 2015. (c) 2014 Wiley Periodicals, Inc.
引用
收藏
页码:82 / 87
页数:6
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