Cyclic fatigue resistance tests of Nickel-Titanium rotary files using simulated canal and weight loading conditions
조옥인, Antheunis Versluis, Gary SP Cheung, 하정홍, Hur Bock, 김현철,
소속 상세정보
조옥인 ( Cho Ok-In ) - Pusan National University School of Dentistry Department of Conservative Dentistry
( Antheunis Versluis ) - University of Tennessee Health Science Center College of Dentistry Department of Bioscience Research
( Gary SP Cheung ) - Hong Kong SAR the University of Hong Kong Faculty of Dentistry Area of Endodontics
하정홍 ( Ha Jung-Hong ) - Kyungpook National University School of Dentistry Department of Conservative Dentistry
( Hur Bock ) - Pusan National University School of Dentistry Department of Conservative Dentistry
김현철 ( Kim Hyeon-Cheol ) - Pusan National University School of Dentistry Department of Conservative Dentistry
KMID : 0362320130380010031
Abstract
Objectives: This study compared the cyclic fatigue resistance of nickel-titanium (NiTi) files obtained in a conventional test using a simulated canal with a newly developed method that allows the application of constant fatigue load conditions.
Materials and Methods: ProFile and K3 files of #25/.06, #30/.06, and #40/.04 were selected. Two types of testing devices were built to test their fatigue performance. The first (conventional) device prescribed curvature inside a simulated canal (C-test), the second new device exerted a constant load (L-test) whilst allowing any resulting curvature. Ten new instruments of each size and brand were tested with each device. The files were rotated until fracture and the number of cycles to failure (NCF) was determined. The NCF were subjected to one-way ANOVA and Duncan's post-hoc test for each method. Spearman's rank correlation coefficient was computed to examine any association between methods.
Results: Spearman's rank correlation coefficient (ρ = -0.905) showed a significant negative correlation between methods. Groups with significant difference after the L-test divided into 4 clusters, whilst the C-test gave just 2 clusters. From the L-test, considering the negative correlation of NCF, K3 gave a significantly lower fatigue resistance than ProFile as in the C-test. K3 #30/.06 showed a lower fatigue resistance than K3 #25/.06, which was not found by the C-test. Variation in fatigue test methodology resulted in different cyclic fatigue resistance rankings for various NiTi files.
Conclusions: The new methodology standardized the load during fatigue testing, allowing determination fatigue behavior under constant load conditions.
키워드
Constant angle; Constant load; Cyclic fatigue fracture; Nickel-titanium rotary file; Simulated canal
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