IN VITRO COMPARISON OF CYCLIC FATIGUE RESISTANCE OF PROTAPER NEXT AND TRUSHAPE 3D CONFORMING FILE NICKEL-TITANIUM ROTARY INSTRUMENTS

Authors : Ahmet Demirhan UYGUN, Mehmet ÜNAL, Mehmet Sinan EVCİL, Halit ALADAĞ

Pages : 385-389

Doi:10.17567/ataunidfd.831765

View : 19 | Download : 5

Publication Date : 2021-07-14

Article Type : Research Paper

Abstract :Abstract Aim: The purpose of this study was to compare the cyclic fatigue resistance of all instruments of the ProTaper Next insert ignore into journalissuearticles values(PTN); and TRUShape 3D Conforming File insert ignore into journalissuearticles values(TRS); systems. Materials and Methods: A total of 120 nickel–titanium rotary instruments were divided into eight groups: PTN X1, PTN X2, PTN X3, PTN X4, TRS 20/.06v, TRS 25/.06v, TRS 30/.06v and TRS 40/.06v. Each group had 15 instruments. All the instruments were tested for cyclic fatigue resistance in stainless steel artificial canals with 5 mm radius and 60° angle of curvature. They were rotated until they got fractured, and the test was performed in a saline solution at 35°C insert ignore into journalissuearticles values(±2);. The number of cycles to fracture insert ignore into journalissuearticles values(NCF); was calculated by measuring the time to fracture. The NCF data were analysed statistically using the Kruskal–Wallis H and post hoc Tamhane T2 tests for multiple comparisons insert ignore into journalissuearticles values(α-level = 0.05);. Results: The PTN X1 group had the highest NCF insert ignore into journalissuearticles values(P < 0.05);. There was no statistically significant difference between the X2 and TRS 25/.06 groups insert ignore into journalissuearticles values(P > 0.05);. However, there was a statistical difference between the other groups of similar sizes insert ignore into journalissuearticles values(X1–TRS 20/.06v); insert ignore into journalissuearticles values(X3–TRS 30/.06v); insert ignore into journalissuearticles values(X4–TRS 40/.06v); insert ignore into journalissuearticles values(P < 0.05);. Conclusion: Within the limitations of this study, most of the PTN instruments insert ignore into journalissuearticles values(X1, X3, and X4); have better cyclic fatigue resistance than do TRS instruments insert ignore into journalissuearticles values(20/.06, 30/.06 and 40/.06); even if they were manufactured with older technology. This result showed that the S-curve design increases the risk of fracture in instruments with large tapers and tip sizes. Keywords: cyclic fatigue resistance, S-curve design, TRUShape
Keywords : cyclic fatigue resistance, S curve design