کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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3167710 | 1199376 | 2010 | 4 صفحه PDF | دانلود رایگان |
ObjectiveThe aim of this study was to evaluate cyclic fatigue resistance of used and new RaCe rotary nickel-titanium instruments.Study designForty RaCe (FKG Dentaire, La-Chaux-de-Fonds, Switzerland) instruments of sizes 30/.06, 30/.02, 25/.04, and 25/.02 were selected and divided into 2 groups: group A = 20 new instruments; group B = 20 used instruments. In group B, each instrument was used for shaping 5 curved molar root canals. Cyclic fatigue testing of new and used instruments was performed using a device that allowed the instruments to rotate freely inside a stainless steel artificial canal. Data were analyzed using t test to determine any statistical significance between used and new instruments of the same file size.ResultsFor all sizes, new instruments were more resistant to failure then the used ones (P < .05). A reduction in lifespan was observed ranging from 18% (30/.06) to 51% (25/.02).ConclusionThe results showed that clinical use significantly reduced cyclic fatigue resistance of RaCe rotary instruments compared with new ones.
Journal: Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology - Volume 109, Issue 3, March 2010, Pages e131–e134