Abstract
Objective: Aim of the present study is to evaluate mechanical properties of a newly developed rotary file, AF Rotary (Fanta Dental, Shanghai, China), and to compare these features with a worldwide spread rotary file, Protaper Gold F2 (PTG F2; Dentsply Maillefer, Ballaigues, Switzerland). Material and Methods: 60 AF Rotary 25.06 and 60 PTG F2 were divided in three groups of 20 files each. A group underwent to cyclic fatigue resistance tests, second group underwent to torsional resistance tests, third group underwent to bending tests. The statistical analysis was performed using t student test with significance level set at 95% (p < 0.05). Results: AF Rotary showed significantly higher torsional resistance and cyclic fatigue resistance (p < 0.05) when compared to the PTG F2. AF Rotary also showed significantly lower bending resistance (p < 0.05) when compared to the PTG F2. Conclusion: Therefore, within the limitations of this study, the results show better performances for AF Rotary compared to PTG F2 regarding the cyclic fatigue test, the torsional test and the bending test. Since the PTG F2 is a commonly used and widely investigated instrument it could be possible to state that the AF Rotary exhibits remarkable in vitro performances. Keywords AF Rotary; Protaper gold; NiTi rotary instruments; Cyclic fatigue; Torsional resistance.
Highlights
The introduction of nickel–titanium (NiTi) alloy for endodontic instruments in the last decades has significantly improved the simplicity, the predictability and duration of the root canal treatment (RCT), by reducing number of instruments to achieve an adequate level of shaping
Since intracanal separation are often difficult to predict, is very important to minimize the risk of intracanal separation with an accurate threedimensional study of roots anatomy, and to correctly visualize canal trajectories, using cone beam computed tomography (CBCT), avoiding superimposition of hard tissues [6,7]
To date there are no studies comparing the two proprietary heat treatments, the results showed higher cyclic fatigue resistance, higher torsional resistance and an increased flexibility of the AF Rotary compared to the Protaper Gold F2 (PTG F2)
Summary
The introduction of nickel–titanium (NiTi) alloy for endodontic instruments in the last decades has significantly improved the simplicity, the predictability and duration of the root canal treatment (RCT), by reducing number of instruments to achieve an adequate level of shaping. Despite many advantages, these instruments are subjected to repeated and high stress, related to the complexity of root canal anatomy, and intracanal separation of rotary NiTi instruments is still a rather frequent iatrogenic error that may negatively affect the outcome of the treatment [1,2,3,4,5]. These studies investigated mainly the following properties: flexibility, cutting efficiency, cyclic fatigue and torsional resistance
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