Abstract
The present study seeks to describe a novel digital measurement technique for analyzing the wear volume of controlled memory (CM)-wire NiTi alloy endodontic reciprocating files after clinical use. Material and Methods: Ten CM-wire NiTi endodontic reciprocating files were randomly used in ten first upper molar teeth within four root canals. The CM-wire NiTi alloy endodontic reciprocating files were subjected to preoperative and postoperative micro-computed tomography (micro-CT) scans to obtain accurate digital imaging and communication on medicine (DICOM) digital files, which were segmented using intensity-based thresholding and an exclusive OR (XOR) logical operation (Boolean algebra logical operator) to obtain a mask of the location to localize and quantify the wear volume of the CM-wire NiTi alloy endodontic reciprocating files. Gage repeatability and reproducibility statistical analysis was applied to assess the reproducibility and repeatability of this measurement technique. Results: The analysis showed a repeatability and reproducibility of 0.00% for the digital measurement technique used to analyze the wear volume of CM-wire NiTi alloy endodontic reciprocating files after clinical use. Wear was mostly identified at the tip and cutting edges of the CM-wire NiTi alloy endodontic reciprocating files. Conclusions: This novel digital measurement technique is a repeatable, reproducible, and accurate method of quantifying the wear volume of CM-wire NiTi alloy endodontic reciprocating files after clinical use.
Highlights
The removal of bacteria from the root canal system is one of the most significant factors influencing the prognosis of root canal treatment [1]; as a result, techniques for cleaning and shaping procedures are continuously being developed to help reduce bacterial loads within the root canal system with a view to preventing endodontic failure caused by persistent or secondary dental infections [2]
There is the ongoing development of endodontic rotary files, regarding both the chemical composition of metal alloys and their geometrical design, which improves the mechanical resistance of endodontic rotary files to bending and torsional stress [5]
A larger apical diameter and taper are correlated with lower cyclic fatigue resistance in nickel–titanium (NiTi) endodontic rotary files, with the files becoming more liable to fracture unexpectedly [3]
Summary
The removal of bacteria from the root canal system is one of the most significant factors influencing the prognosis of root canal treatment [1]; as a result, techniques for cleaning and shaping procedures are continuously being developed to help reduce bacterial loads within the root canal system with a view to preventing endodontic failure caused by persistent or secondary dental infections [2]. There is the ongoing development of endodontic rotary files, regarding both the chemical composition of metal alloys and their geometrical design, which improves the mechanical resistance of endodontic rotary files to bending and torsional stress [5]. Other characteristics of the geometrical design of endodontic rotary files that reportedly influence instrument performance include the cross section [6]; the helix angle, flute length, and pitch [7]; and the taper and apical diameter [4]. A larger apical diameter and taper are correlated with lower cyclic fatigue resistance in nickel–titanium (NiTi) endodontic rotary files, with the files becoming more liable to fracture unexpectedly [3]. NiTi endodontic rotary files fracture at a rate of between 0.09% and 5% [8,9], with both
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