کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3147267 1197356 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of Raw Material and Rotational Speed on the Cyclic Fatigue of ProFile Vortex Rotary Instruments
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی دندانپزشکی، جراحی دهان و پزشکی
پیش نمایش صفحه اول مقاله
Effects of Raw Material and Rotational Speed on the Cyclic Fatigue of ProFile Vortex Rotary Instruments
چکیده انگلیسی

IntroductionThis in vitro study compared the cyclic fatigue resistance of ProFile Vortex rotary instruments (DENTSPLY Tulsa Dental, Tulsa, OK) made of two different raw materials: M-Wire and regular superelastic wire (SE-wire) at two different rotational speeds. Two rotary-based Profile Vortex instruments with taper 0.04 and 0.06 (25 mm in length and #30 in size) were compared.MethodsCyclic fatigue testing was performed by rotating instruments in an artificially constructed stainless steel canal with a 5-mm radius and a 90° angle of curvature at two different test frequencies: 300 and 500 rpm. The time to failure was recorded, and the total number of cycles to failure was calculated and compared for a total of 160 samples. Statistical analysis was performed with one-way analysis of variance and the Tukey test for individual comparisons (confidence level of p < 0.05). Fracture surfaces of broken instruments were also observed under scanning electron microscopy. Over 50% of broken files made of SE-wire exhibited multiple crack initiation sites compared with the single crack initiation on files made of M-Wire.ResultsOverall, there were significant differences in rotary instruments made of different materials (p < 0.001). However, for rotary instruments made from the same material (either M-Wire or SE-wire), there was no significant difference (p > 0.05) of cyclic fatigue life under different rotational speeds (300 and 500 rpm).ConclusionsProFile Vortex files made of M-Wire exhibited superior cyclic fatigue resistance (∼150% longer in fatigue life) compared with those made of regular SE-wire at two test frequencies (300 and 500 rpm).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Endodontics - Volume 36, Issue 7, July 2010, Pages 1205–1209
نویسندگان
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