کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3148071 1197387 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cyclic Fatigue of ProFile Vortex and Vortex Blue Nickel-Titanium Files in Single and Double Curvatures
ترجمه فارسی عنوان
خستگی فصلی پرومکس و ورتکس نیکل و تیتانیوم آبی نایلون در فایلهای انحنای تک و دو
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی دندانپزشکی، جراحی دهان و پزشکی
چکیده انگلیسی


• Vortex and Vortex Blue files follow different trajectories in artificial canals with identical parameters.
• In single curvature canals, cycles to fracture of the 2 files is significantly higher compared with that in the 2 double curvature canals.
• Vortex Blue files show superior fatigue resistance compared with Vortex files in a single curvature canal.
• On both double curvature canals, fatigue resistance of Vortex and Vortex Blue is not statistically different from each other.
• The vast majority of files that fractured in double curvature canals show multiple crack origins.

IntroductionThe aims of this study were to determine the flexibility of ProFile Vortex (VX) and Vortex Blue (VB) files (Dentsply Tulsa Dental Specialties, Tulsa, OK) and then to evaluate and compare their fatigue resistance in artificial single curvature and 2 different artificial double curvature canals.MethodsFlexibility of the files (size 25/.04) in bending was assessed according to ISO 3630-1. Both files were subjected to fatigue tests inside artificial canals with a single curvature (group 1: 60° curvature, 5-mm radius) and with 2 different double curvatures (group 2: first [coronal] curve of 60° curvature and 5-mm radius and the second one [apical] of 30° curvature and 2-mm radius and group 3: first curve of 60° curvature and 5-mm radius and the second one of 60° curvature and 2-mm radius). The number of cycles to fracture (NCF) was recorded, and the fracture surface of all fragments was examined with a scanning electron microscope.ResultsThe bending load was significantly lower for VB files than VX files (P < .05), and the 2 types of files followed different trajectories in identical canals. In group 1, the 2 files had significantly higher NCF than in groups 2 and 3 (P < .05). Both files had significantly higher NCF in group 2 than in group 3 (P < .05). In group 1, VB files had fatigue resistance superior to VX files (P < .05), whereas in groups 2 and 3 their fatigue resistance was not statistically different from each other. The crack initiation of a vast majority of files that fractured in double curvature canals (groups 2 and 3) was localized on either 1 of 2 of the 3 cutting edges.ConclusionsDouble curvature canals represent a much more stressful and challenging anatomy than single curvature canals, and, in them, fatigue resistance may be affected by the degrees and the radii of curvatures as well as by the bending properties of the files.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Endodontics - Volume 41, Issue 10, October 2015, Pages 1686–1690
نویسندگان
, , , , , , ,