An analysis of cyclic fatigue resistance of reciprocating instruments in different canal curvatures after immersion in sodium hypochlorite and autoclaving: An in vitro study

Champa, C; Divya, V.; Srirekha, A; Karale, Rupali; Shetty, Ashish; Sadashiva, Pushpalatha

doi:10.4103/0972-0707.218307

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…2) with passive adjustment and without pressure in a stainless-steel block containing an artificial canal with the following characteristics: 60º curvature, radius of curvature 3.5 mm, length 21 mm, width 2 mm, and depth 3 mm. The characteristics of model were similar to the block used by Gambarini et al ( 17 ) and Champa et al ( 18 ). The canal was lubricated with glycerin after each file.…”

Section: Methodsmentioning

confidence: 90%

A Comparative Study of Cyclic Fatigue of 10 Different Types of Endodontic Instruments: an in Vitro Study

Rubio¹,

Zarzosa²,

Pallarés³

2019

Acta Stomatol Croat

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Objective This study was designed to test the null hypothesis that there were no significant differences between size 25 files F360, F6 SkyTaper, Hyflex EDM, iRace, Neoniti, One Shape Protaper Next, Reciproc, Revo-S and Wave One Gold in terms of resistance to cyclic fatigue and length of broken fragments. Material and methods 300 new size 25 files of the systems studied were selected (n=30). The instruments were mechanized with a X-Smart Plus endo motor at the speed and torque recommended by the manufacturer, holding the instruments steady with a clamping mechanism, with passive adjustment and without pressure in a stainless-steel block. The time was calculated in seconds until fracture. The number of fatigue cycles was calculated as (Resistance (s) x Speed)/60. The separated fragment lengths were measured with a digital Vernier calliper. A statistical analysis was performed with the SPSS 18 programme at a 95% confidence level, using the Levene´s Test to compare variances, the Welch’s Test to compare means, and the Games-Howell´s Test to reveal differences between groups. Results The Levene’s Test showed no equal variances (P<0.05). The Welch’s Test (P<0.05) showed significant differences in cyclic fatigue and separated fragment lengths. The Games-Howell test (P<0.05) exhibited significant differences in multiple comparisons, (P<0.05). Conclusions The systems with CM-Wire (Hyflex EDM and Neoniti) were superior in resistance to the other systems for cyclic fatigue. For separated fragment lengths, F360 (conventional NiTi) and Reciproc (M-Wire) were better significantly better in terms of resistance.

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Section: Methodsmentioning

confidence: 90%

A Comparative Study of Cyclic Fatigue of 10 Different Types of Endodontic Instruments: an in Vitro Study

Rubio¹,

Zarzosa²,

Pallarés³

2019

Acta Stomatol Croat

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“…In a previous study, ProFile and RaCe NiTi files size 25 taper 04 immersed in a heated 5.25% NaOCl solution for 1 or 2 hours showed significant reduction in fatigue resistance by 40% or more [ 7 ]. Immersion of Reciproc R25 and WaveOne in 2.5% NaOCl for 5 min decreased the cyclic fatigue resistance significantly ( p < 0.05) as compared to the control group [ 10 ].…”

Section: Discussionmentioning

confidence: 99%

Resistance to Cyclic Fatigue of Nickel-Titanium Files Immersed in Sodium Hypochlorite at Body Temperature

Abuhulaibah

AbuMostafa

2020

International Journal of Dentistry

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Background/purpose. To assess the resistance to cyclic fatigue (CF) displayed by two nickel-titanium (NiTi) files, One Curve (OC) and ProTaper Gold (PTG), after their immersion in 2.5% sodium hypochlorite (NaOCl) solution at body temperature. Materials and Methods. Forty-five files from each brand were randomly assigned to three groups (n = 15) and subjected to the following: no immersion (control), 1-minute immersion, and 5-minute immersion in 2.5% NaOCl at 37°C. CF for all the files was tested within a well-lubricated stainless-steel artificial canal in a water bath at 37°C simulating body temperature. The procedure was video recorded, and the number of cycles to fracture (NCF) was calculated by multiplying the time taken to fracture, with the number of rotations per second. The data were analyzed for normality, and thereafter, one-way ANOVA with multiple Bonferroni was used as the post hoc test. Results. The resistance to CF of OC files was significantly higher than PTG files in all groups. In groups immersed in NaOCl for one minute, OC files showed significant drop in the CF resistance; PTG files showed a drop as well but not significantly. Both files demonstrated a significant drop in resistance to CF after immersion in NaOCl for five minutes compared to the control group. Conclusion. OC files were significantly more resistant to CF compared to PTG in all groups. Immersion in 2.5% NaOCl for 5 minutes significantly reduced the resistance to CF for all the files.

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“…It appears that the temperatures the files are exposed to during autoclave sterilization may not be high enough to incur serious alterations in the microstructure of the NiTi alloy, which would negatively affect its resistance to fatigue. This finding was echoed in previous studies [6,8,22,23] that detected no detrimental influence of autoclave sterilization on the cyclic fatigue resistance of conventional or heat-treated NiTi files. In fact, Viana et al [22] reported an increase in the cyclic fatigue resistance of Profile files after 5 autoclaving cycles, while Champa et al [23] found the same increase in Reciproc files.…”

Section: Discussionmentioning

confidence: 52%

“…This finding was echoed in previous studies [6,8,22,23] that detected no detrimental influence of autoclave sterilization on the cyclic fatigue resistance of conventional or heat-treated NiTi files. In fact, Viana et al [22] reported an increase in the cyclic fatigue resistance of Profile files after 5 autoclaving cycles, while Champa et al [23] found the same increase in Reciproc files. However, Hilfer et al [24] reported a decrease in the cyclic fatigue resistance of a size 25/0.06 Twisted File.…”

Section: Discussionmentioning

confidence: 52%

Effect of Autoclaving Cycles on the Cyclic Fatigue Resistance of Race and Race Evo Nickel-Titanium Endodontic Rotary Files: An In Vitro Study

Almohareb

Barakat

Albakri

et al. 2021

Metals

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Objective: The aim of this study was to evaluate the influence of autoclave sterilization on the resistance to cyclic fatigue of two nickel-titanium (NiTi) endodontic files of identical design and taper, but with different NiTi alloy treatments: the newly introduced heat-treated Race Evo and the electropolished Race files. Materials and methods: Fifteen Race (25/0.06) files and fifteen Race Evo (25/0.06) files (n = 30 in total) were randomly assigned to five sub-groups each consisting of three files of the same NiTi alloy treatment. One group served as a control with files unautoclaved. The four remaining groups were sterilized in a steam sterilizer for 1, 3, 5, and 10 autoclave cycles, respectively. Files then underwent cyclic fatigue testing in a simulated metal canal block. A scanning electron microscope was used to inspect the surface of the fractured instruments. Statistical analysis was conducted using independent t-test and multi-factorial analysis of variance with significance set at a p value of ≤0.05. Results: Both Race Evo and Race files showed no significant difference between the different autoclaving cycles in terms of the number of cycles to fracture (p = 0.232 and p = 0.359). Despite rotating at a higher speed, the number of cycles to fracture of heat-treated Race Evo files was significantly higher than that of Race files (p ≤ 0.0001). Conclusion: Autoclave sterilization has no significant effect on the resistance to cyclic fatigue of heat-treated Race Evo or electropolished Race files. However, Race Evo files showed superior resistance to cyclic fatigue irrespective of autoclaving cycles.

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An analysis of cyclic fatigue resistance of reciprocating instruments in different canal curvatures after immersion in sodium hypochlorite and autoclaving: An in vitro study

Cited by 15 publications

References 22 publications

A Comparative Study of Cyclic Fatigue of 10 Different Types of Endodontic Instruments: an in Vitro Study

A Comparative Study of Cyclic Fatigue of 10 Different Types of Endodontic Instruments: an in Vitro Study

Resistance to Cyclic Fatigue of Nickel-Titanium Files Immersed in Sodium Hypochlorite at Body Temperature

Effect of Autoclaving Cycles on the Cyclic Fatigue Resistance of Race and Race Evo Nickel-Titanium Endodontic Rotary Files: An In Vitro Study

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