Cyclic fatigue of Profile rotary instruments after prolonged clinical use

被引:126
作者
Gambarini, G [1 ]
机构
[1] Univ La Sapienza, Fac Dent, Dept Periodont Endodont, Rome, Italy
关键词
cyclic fatigue; nickel-titanium; rotary instruments;
D O I
10.1046/j.1365-2591.2001.00259.x
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Aim The purpose of the present study was to evaluate resistance to cyclic fatigue of new and used Profile Ni-Ti rotary instruments. Methodology Used instruments were operated in 10 clinical cases using passive instrumentation and a crown-down preparation technique. Cyclic fatigue testing of new and used engine-driven instruments was then performed with a specific device which allowed the instruments to rotate freely inside a stainless steel artificial canal, whilst maintaining conditions close to the clinical situation. Instruments were rotated until fracture occurred and time to fracture was visually recorded with a chronometer. Results A significant reduction of rotation time to breakage (life span) was noted between new and used instruments. In all sizes new instruments were significantly more resistant than used ones (two-sample t-test, P < 0.01). No instrument underwent intracanal failure during clinical use. Conclusions Prolonged clinical use of Ni-Ti engine-driven instruments significantly reduced their cyclic fatigue resistance. Nevertheless, each rotary instrument was successfully operated in up to 10 clinical cases without any intracanal failure.
引用
收藏
页码:386 / 389
页数:4
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