Cyclic Fatigue Life Assessment of a Newer Heat-treated Reciprocating NiTi File in a 90-degree Canal Curvature
Year: 2019
Type: article
Abstract: Aim: The purpose of this study was to compare the cyclic fatigue resistance WaveOne Gold and WaveOne files in a reciprocating motion.Materials and methods: A total of 24 new rotary WaveOne Gold (ISO size = 25, taper = 0.07, length = 25 mm) and WaveOne files (ISO size = 25, taper = 0.08, length = 25 mm) were selected and divided into 2 groups (n = 12 each).A cyclic fatigue-testing device was fabricated with a 90-degree angle of curvature and a 5 mm radius.All instruments were reciprocated until fracture occurred.The time was taken for each instrument to fracture, and the length of the broken fragments was recorded.All the fractured files were analyzed under a scanning electron microscope to detect the mode of fracture.The Kolmogorov-Smirnov test was used to assess the normality of sample distribution, and statistical analysis was performed using the independent sample t test.Results: The time taken for the instruments of WaveOne Gold group to fail under cyclic loading was significantly longer compared with the WaveOne group (p < 0.001).Scanning electron microscopic observations showed that the instruments of all groups had undergone a ductile mode of fracture.The length of the fractured segments was between 1.5 and 5 mm, which was statistically significant among the experimental groups.Conclusion: WaveOne Gold instruments showed a significantly higher cyclic fatigue resistance compared to WaveOne in a reciprocating motion.
Language: English
Subfield: Oral Surgery
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W3000424909