Cyclic fatigue resistance of three rotary file systems in a dynamic model after immersion in sodium hypochlorite

Palma, Paulo J.; Messias, Ana; Cerqueira, António Rosa; Tavares, Luís Diogo; Caramelo, Francisco; Roseiro, Luís; Santos, João Miguel

doi:10.1007/s10266-018-0401-2

Cited by 40 publications

(40 citation statements)

References 39 publications

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“…The significance of conducting both the immersion and testing at body temperature was to mimic the clinical condition and thereby obtain dependable data [ 11 , 27 ]. Care was also taken to immerse only 16 mm from the tip of files in the solution, to avoid galvanic corrosion phenomena [ 12 ].…”

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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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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“…In the static model, there are no axial movements of the instrument in the artificial canal [25]. Conversely, the dynamic model includes back-and-forth or oscillating movements of the instrument in the canal [26,27]. The dynamic model has two advantages compared to the static model.…”

Section: Discussionmentioning

confidence: 99%

Cyclic Fatigue, Torsional Resistance, and Angular Deflection of Two Heat-Treated Files: M-Wire Versus New F-Wire Technology

Khanvilkar

Mallishery

Sawant

et al. 2020

Metals

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The cyclic fatigue, torsional resistance, and angular deflection of a new Fire-Wire rotary file (CricENDO) were compared. A total of 20 files of each type were tested. Cyclic fatigue testing was performed for each group (n = 10) by measuring the number of cycles to fracture (NCF) in an artificial stainless-steel canal (60° angle of curvature, with a 6-mm radius) for each group. The torque and angle of rotation at the failure of each group (n = 10) were measured according to ISO 3630-1. The fractured surfaces were examined using scanning electron microscopy. Statistical analysis was carried out utilizing Student’s t-test at a significance level set at 5%. The Fire-Wire CricENDO rotary files were associated with a significantly higher number of cycles to fracture and time to failure (in seconds) compared to the M-Wire Protaper Next (p < 0.05). A significantly higher angular deflection to fracture was observed for CricENDO compared to Protaper Next (p < 0.05). The new Fire-Wire CricENDO rotary files exhibit higher cyclic fatigue resistance and angle of rotation to fracture than M-Wire Protaper Next. Without warning, file fracture may occur as a result of cyclic fatigue, torsional stress, or a combined effect of both. CricENDO rotary files may be an effective alternative in curved root canals as they exhibited elevated cyclic and torsional resistance. It will be helpful in eliminating one of the reasons for file fracture during the root canal treatment.

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“…As described in a previous study [1], complex reasons based on a variety of factors such as the material [6] and design [7] of the fi les used, the application or drive technology [2,8], the dynamic or static testing conditions during preparation [9], the environmental temperature [9] and user experience [2] are associated with breakage of the NiTi instruments. Thus, these instruments are claimed to cut dentine effectively and offer a large chip space for dentin transportation.…”

Section: Instrument Failure Ratementioning

confidence: 99%

Shaping ability of rotary instrumentation techniques and their limitations in simulated root canals

Giraki¹,

Harapetian²,

Rüttermann³

et al. 2019

J Dent Probl Solut

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The aim of this in vitro study was to describe the shaping ability of rotary nickel-titanium (NiTi) instruments (Mtwo, VDW, Munich, Germany) with benefi cial properties in combination with two different endodontic devices (Mtwo direct and Endo IT professional) and to compare them with Mity NiTi K-Files (Loser, Leverkusen, Germany) in combination with preparation by hand in severely curved simulated root canals of acrylic blocks. Thirty blocks simulating a severely curved root canal were divided into three groups (n=10 for each). All canals were prepared with NiTi fi les to an ISO size of 40 using an apical-coronal preparation technique. Mtwo NiTi fi les were used for the automatic systems, while Mity K-Files were used for the preparation by hand. We evaluated the frequency of instrument failure, the preparation time, loss of working length, loss of weight, elbow-zip effects, and changes in root canal anatomy. The data were analysed statistically using one-way ANOVA followed by a post hoc Bonferroni test (p < 0.05). No instrument failures were observed. The preparation time was signifi cantly longer when preparing by hand (16.64 min) than for both automatic systems, which did not differ signifi cantly. Loss of working length could be detected for all systems (0.3-0.4mm for Mtwo instruments and 1.3mm for Mity K-Files), in which differences between the systems were not statistically, but possibly clinically, signifi cant. Irrespective of the torque-controlled motor, the shape of the canal anatomy was not retained with the Mtwo instruments nor with the Mity K-Files by hand preparation. The Mtwo fi les in combination with the automatic preparation of root canals with both systems caused an audible material loss in comparison to the Mity K-File. This was especially evident when comparing the material removal on the inner side and outside of the root canal curvature. Within the limitations of this study, the results indicate that the torque-limited rotation handpiece Mtwo direct can be seen as an alternative to the electric low-torque control motor and is superior to hand preparation due to shorter preparation times and lower working length losses.

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Cyclic fatigue resistance of three rotary file systems in a dynamic model after immersion in sodium hypochlorite

Cited by 40 publications

References 39 publications

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

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

Cyclic Fatigue, Torsional Resistance, and Angular Deflection of Two Heat-Treated Files: M-Wire Versus New F-Wire Technology

Shaping ability of rotary instrumentation techniques and their limitations in simulated root canals

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