Abstract
Background: Surface roughness is one of the most important characteristics of endodontic instruments, correlating to instrument fracture. The purpose of this study was to measure the surface roughness values of these instruments before and after resin root canal preparation without previous glide path preparation, with the new method. Data was obtained from field emission scanning electron microscopes (FE-SEM) combined with independent ImageJ software (NIH, Bethesda, MD, USA). Methods: A total of 20 simulated J-shape resin blocks with a radius of 4.5 mm, length of 16 mm, and angle of inflection of 600 were chosen and distributed into two equal groups. Each group was prepared by the WaveOne Gold Primary (Dentsply Sirona, Maillefer, Ballaigues, Switzerland) or the Reciproc Blue R25 (VDW, Munich, Germany) instruments, without glide path preparation. Special molds were used to confirm the same areas on the cutting blade at 3 mm and the instruments’ tips were scanned by FE-SEM, at different observed times. The parameters of Ra, Rq, and Rz in each sample were collected using the ImageJ software for analyses. The data was processed using the paired t-test with a significance level of 0.05. Results: Right after the first resin canal instrumentation, the surface roughness parameters of the two reciprocating investigated instruments were decreased. Conclusions: The FE-SEM images processed using the ImageJ software offered a trustworthy and suitable method for assessment of the NiTi endodontic file surface roughness.
Highlights
Root canal preparation plays an important role in endodontic treatment
The Reciproc Blue (RB) (VDW, Munich, Germany) and WaveOne Gold (WOG) (Dentsply Sirona, Maillefer, Ballaigues, Switzerland) instruments have been developed with many distinctive features in designs and thermal treatments.[3]
The statistical values of the roughness parameters (Ra), Rq, and Rz were showed in the Table 1.22 All data were normally distribution using the Shapiro-Wilk test
Summary
Root canal preparation plays an important role in endodontic treatment. This step is critical and facilitates obturation.[1]. The Reciproc Blue (RB) (VDW, Munich, Germany) and WaveOne Gold (WOG) (Dentsply Sirona, Maillefer, Ballaigues, Switzerland) instruments have been developed with many distinctive features in designs and thermal treatments.[3] The instruments are subjected to the proprietary post-machining heat processes after being ground by machine. This treatment produces the oxide layer with the specific blue or gold.[4]. Conclusions: The FE-SEM images processed using the ImageJ software offered a trustworthy and suitable method for assessment of the NiTi endodontic file surface roughness
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