Abstract
Instrumentation is a fundamental step in endodontic treatment to promote proper cleaning and shaping of the canal. The objective of this study was to compare the cutting capacity of two reciprocal nickel-titanium systems in simulated canal blocks. Sixty acrylic blocks were used, divided into two groups of reciprocal files (WaveOne Gold - WOG and W-File - WF), each with 30 blocks and divided into 3 groups (n=10) representing the first, second and third uses: WOG1, WOG2, WOG3, WF1, WF2, and WF3, respectively. Ink was injected into the simulated channels, which were covered with laminated paper to avoid affecting the instrumentation. For irrigation, 5mL of saline was used at each instrument change. At the end of instrumentation, the blocks were photographed and analyzed in a computer program to compare the results before and after instrumentation. In the statistical analysis, the tests S Shapiro-Wilk, T for independent samples and Mann Whitney were performed. Under the experimental conditions in which this study was conducted, it is concluded that there were no significant differences in apical transport after the third application. However, the instruments of the W-File group had more conservative preparations with a better centralization capacity compared to the instruments of the WaveOne Gold group, which caused preparations with a larger diameter.
Highlights
One of the most important steps in endodontic treatment is mechanical-chemical preparation (PQM), in which we use rinsing substances for chemical cleaning and sharp instruments for mechanical cleaning
The acrylic blocks were filled with black nankin paint (Acrilex, China) and photographs were taken to record the original shapes of the channels
The aim of this study was to compare two reciprocal systems depending on their cleaning and shaping quality in simulated canals in acrylic blocks after their third use
Summary
One of the most important steps in endodontic treatment is mechanical-chemical preparation (PQM), in which we use rinsing substances for chemical cleaning and sharp instruments for mechanical cleaning. Through PQM, we achieve adequate cleaning of root canals, which requires harmony between irrigation and instrumentation to reduce the bacterial community. In addition to cleaning, shaping the canal is important, and files play an important role in this process. WaveOne Gold files (Dentsply Maillefer, Ballaigues, Switzerland) and W files (TDKaFile, Shenzhen, China) were selected to evaluate cutting efficiency after their third use in simulated canals in acrylic blocks. The WaveOne Gold file has a cutting edge made of Ni-Ti and has been improved in manufacturing to increase elasticity. The W-File file, on the other hand, is made of Ni-Ti and has instruments with different tip sizes and tapers and a parallelogram cross-section similar to that of the WaveOne Gold (Calefi et al, 2019), (Metzger et al, 2013)
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