Microstructural, microchemical, and mechanical changes associated with the clinical reuse of two nickel–titanium endodontic instruments

Restrepo-Restrepo, Felipe Augusto; Holguín-Vásquez, Viviana Andrea; Cañas‐Jiménez, S. J.; Villa-Machado, Paula; Ochoa-Soto, Sara; Orozco, Claudia Patricia Ossa; Tobón‐Arroyave, Sergio Iván

doi:10.4103/1735-3327.318943

Cited by 3 publications

(2 citation statements)

References 46 publications

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“…is complex manufacturing process produces pits, groves, and cracks on the surface of NiTi instruments [26], which increases the friction between the instruments and the canal wall and subsequently deteriorates the cutting angle, cutting efficiency, strength, and fatigue resistance. us, high SR values can be understood as stress-concentration points, which lead to crack initiation and propagation during clinical use and finally to instrument separation [27][28][29].…”

Section: Discussionmentioning

confidence: 99%

The Impact of Multiple Autoclave Cycles on the Surface Roughness of Thermally Treated Nickel-Titanium Endodontic Files

Ba-Hattab

Almohareb

Alkhalaf

et al. 2022

Advances in Materials Science and Engineering

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In this study, we evaluate the surface roughness (SR) of three thermally treated nickel-titanium rotary instruments (i.e., TruNatomy [TN], ProTaper Gold [PTG], and EdgeTaper Platinum [ETP]) after impact testing with multiple autoclave sterilization cycles using scanning electron microscopy (SEM). Overall, 60 thermally treated files were sourced (i.e., 20 TN, 20 ETP, and 20 PTG files), and each group was divided into four equal subgroups of five files (n = 5). An unsterilized group was assigned as the pre-autoclaving group (Cycle 0), and the other three groups underwent various autoclave sterilization cycles (Cycles 1, 5, and 10). The roughness average (Ra), root mean square (Rq), and average maximum peak-to-valley height (Rz) values were evaluated using SEM and ImageJ software. The Shapiro–Wilk test, one-way analysis of variance, and post-hoc Tukey test were used to analyze the data. The statistical significance level was set at p < 0.05 . Before autoclaving, all instruments showed debris and SR but with no statistically significant differences existing between the groups. SR values decreased after one autoclaving cycle for all instruments. After five autoclave cycles, the Rz value of ETP was statistically higher compared with PTG and TN. After 10 autoclave cycles, the Ra and Rq values of TN were statistically higher compared with ETP and PTG. These results suggest that multiple autoclaving sterilization cycles influence the SR of TN, PTG, and ETP, with ETP showing higher levels of surface irregularities than PTG and TN.

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Section: Discussionmentioning

confidence: 99%

The Impact of Multiple Autoclave Cycles on the Surface Roughness of Thermally Treated Nickel-Titanium Endodontic Files

Ba-Hattab

Almohareb

Alkhalaf

et al. 2022

Advances in Materials Science and Engineering

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“…Reuse instruments are one of the factors related to the occurrence of fracture because it generates microstructural, microchemical, and mechanical changes that can be detected in NiTi instruments 4 . Moreover, every time an instrument is reused it goes through a sterilization process, which is capable of generating changes in the resistance to torsional fatigue, even if this result has no direct correlation with the clinical significance of these data 5 .…”

Section: Introductionmentioning

confidence: 99%

Effect of glide path instruments in cyclic fatigue resistance of reciprocating instruments after three uses

Scherer,

Bier,

Vanni

2023

Braz. Dent. J.

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The present study aims to evaluate the effect of different glide path instruments on the cyclic fatigue resistance of reciprocating endodontic instruments after three uses in mandibular molars. Eighteen Wave One Gold Primary reciprocating instruments were selected and randomly divided into three groups according to the glide path instrument: G1 - manual file K #15, G2 - Wave One Glider reciprocating instrument, and G3 (control group) - glide path was not performed. The reciprocating instruments were tested on mandibular molars and subdivided into three other groups: a new instrument, an instrument with a previous single-use, and an instrument with two previous uses. After the endodontic instrumentation, the instruments were subjected to the cyclic fatigue resistance test using an appropriate tool. The data were submitted to the Shapiro-Wilk test, and subsequently the Kruskal-Wallis test with a significance level of 5%. The results showed no statistical difference between the groups. Thus, it was concluded that the creation of a glide path did not affect the cyclic fatigue resistance of the reciprocating instrument. In addition, the reuse of final preparation instruments up to two times proved to be safe since no fractures were observed in the tested instruments.

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Wear Analysis of Four Different Single-File Reciprocating Instruments before and after Four Uses in Simulated Root Canals

Zanza

Reda²,

Familiari³

et al. 2022

Applied Sciences

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The aim of this study is to assess the surface alterations of four reciprocating instruments before and after the shaping of four resin-simulated root canals. The following four different reciprocating instruments are selected: 10 Reciproc Blue (RB25), 10 WaveOne Gold (WOG), 10 EdgeOne Fire (EOF) and 10 recently introduced instruments OneRECI (OR), for a total of 40 new instruments. Before root canal shaping, each instrument is mounted on a stub in a standardized position and observed using a scanning electron microscope (SEM) to detect any surface alteration, such as microfractures, metal defects, deformations, blunt and disruption of cutting edges, debris, pitting and tip flattening. Micrographs are acquired at the level of the tip, 4 mm, 8 mm and 12 mm from it. After that, each instrument is used in four simulated resin root canals. SEM observation was repeated after the simulated clinical use to assess the wear resistance of the instruments. Surface alterations are registered before and after instrumentation and statistical analysis is performed using a Chi-Square test to verify homogeneity of defects distribution and GLM to evaluate the differences of RMS at baseline and after use for both groups (α level 0.05). Before simulated clinical uses, no alterations are found except for three cases of EOF with metal strips in correspondence to the tip, disruption of the cutting edge of WOG and oily spotting on two different OR. After simulated clinical use, EOF shows a statistically significant difference in terms of spiral distortion and flattening of the cutting edges. The OR shows the highest presence of debris despite the ultrasonic cleaning procedures. No instrument fractures are observed. EOF should be discarded after four clinical uses and carefully inspected after each insertion into root canals. Moreover, tough attention should be paid during disinfection and cleaning procedures after instrumentation considering the copious debris detected in each instrument, particularly in OR.

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Microstructural, microchemical, and mechanical changes associated with the clinical reuse of two nickel–titanium endodontic instruments

Cited by 3 publications

References 46 publications

The Impact of Multiple Autoclave Cycles on the Surface Roughness of Thermally Treated Nickel-Titanium Endodontic Files

The Impact of Multiple Autoclave Cycles on the Surface Roughness of Thermally Treated Nickel-Titanium Endodontic Files

Effect of glide path instruments in cyclic fatigue resistance of reciprocating instruments after three uses

Wear Analysis of Four Different Single-File Reciprocating Instruments before and after Four Uses in Simulated Root Canals

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