A comparative evaluation of cyclic fatigue resistance of ProTaper Gold, Dia-X, and ZenFlex nickel–titanium rotary files in the canals with different angles of curvature

Abstract

Objective: The objective of the study is to evaluate and compare the cyclic fatigue resistance of ProTaper Gold (PTG, Dentsply Tulsa Dental Specialties Inc., USA), Dia-X (DX, Diadent Group International, Europe), and ZenFlex (ZF, Kerr Corporation, USA) nickel–titanium (NiTi) rotary files in simulated curved canals with two different angles of curvature. Materials and Methods: A total of 60 new NiTi files (n = 20) with triangular cross-section, 21-mm length and size #20 PTG, DX, and ZF were used for cyclic fatigue testing. A stainless steel block having simulated canals with two different angles of curvature (60° and 90°) was used. 10 files for each curvature were used. The number of cycles to fracture and the fracture length of the fragment were recorded. The data were statistically analyzed using one-way ANOVA followed by Post hoc Tukey's test. Results: Statistically significant difference was found between all the three groups (P 0.05). Conclusions: The PTG showed greater resistance to cyclic fatigue than DX and ZF instruments in both the apical curvatures.

Keywords

• curved canals
• cyclic fatigue resistance
• dia-x
• protaper gold
• zenflex