Effect of autoclaving on the cyclic fatigue resistance of nickel-titanium rotary instruments: An in vitro study

Gayatri, Kukunuru; Tammineedi, Sravanthi; Bolla, Nagesh; Vemuri, Sayesh; Basam, RamChowdary; Sunil, Chukka Ram

doi:10.4103/jcd.jcd_182_21

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Unfortunately, the process of cleaning and shaping of the canal, especially the curved canals, is not always without problems. Various studies have reported deviation of the canal path, occurrence of apical perforation, access cavity perforation, and instrument fracture within the canal [26,27,31]. Preparing an access cavity along a straight line, pre-curving of the files, and using them passively are strategies that can prevent procedural errors [32][33][34].…”

Section: Discussionmentioning

confidence: 99%

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Ex Vivo Comparison of File Fracture and File Deformation in Canals with Moderate Curvature: Neolix Rotary System versus Manual K-files

Mesgarani

Hoshyari²,

Mousazadeh³

et al. 2022

J Res Dent Maxillofac Sci

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Background and Aim: Cleaning and shaping is one of the important steps in endodontic treatment, which has an important role in root canal treatment outcome. This study evaluated the rate of file fracture and file deformation in Neolix rotary system and K-files in shaping of the mesiobuccal canal of maxillary first molars with moderate curvature. Materials and Methods:In this ex vivo experimental study, the mesiobuccal root curvature of maxillary first molars was measured by the Schneider's method, and canal preparation was performed in 2 groups of 30 with Neolix rotary system and manual K-files. To determine the fracture rate of files, a file was used until it broke or deformed, and the number of canals cleaned by that file was recorded. The data were analyzed by the Mann-Whitney U test. Results: File fracture rate in the rotary group was slightly higher than that in the manual K-file group but, the frequency of file deformation in manual K-files was slightly more than that in the rotary group. There was no statistically significant relationship between file type and frequency of file fracture or deformation (P>0.05). Conclusion: Manual stainless steel K files and Neolix NiTi rotary files were the same in terms of file fracture and file deformation in preparation of canals with moderate curvature.

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Section: Discussionmentioning

confidence: 99%

“…Despite a lot of studies, one cannot prefer one single method over others with ideal results [26]. Although previous studies have mentioned the advantages of Neolix rotary system, there are some contradictions [27]. Procedural errors in the course of treatment should be prevented to improve the prognosis of treatment [28].…”

Section: Introductionmentioning

confidence: 99%

Ex Vivo Comparison of File Fracture and File Deformation in Canals with Moderate Curvature: Neolix Rotary System versus Manual K-files

Mesgarani

Hoshyari²,

Mousazadeh³

et al. 2022

J Res Dent Maxillofac Sci

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“…Each instrument was subjected to dynamic cyclic fatigue testing in simulated stainless steel canals with a 60° angle and two radii of curvature 5 and 3 mm. [ 13 14 ] The instruments were examined under a stereomicroscope at ×10 magnification for the presence of any defect before cyclic fatigue testing. [ 5 ]…”

Section: Methodsmentioning

confidence: 99%

Comparative evaluation of cyclic fatigue resistance of thermomechanically treated NiTi rotary instruments in simulated curved canals with two different radii of curvature: An in vitro Study

Hamid,

Malik,

Kumar

et al. 2024

Journal of Conservative Dentistry and Endodontics

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Background: This study aimed to compare the effect of heat treatment on the cyclic fatigue resistance of three different nickel–titanium rotary file systems: TruNatomy, HyFlex CM, and NeoEndo flex in simulated curved canals at two different radii of curvatures. Materials and Methods: A total of 60 NiTi rotary files of three types were used, and the samples were divided into three groups TruNatomy, HyFlex CM, and NeoEndo flex. All the instruments were subjected to cyclic fatigue testing using a stainless steel custom-made canal model with a 60° angle of curvature and two radii of curvature 5 mm and 3 mm; the number of cycles to fracture and length of the fractured segment was measured. The separated instruments were subjected to fractographic analysis under scanning electron microscope. Results: The number of cycles to failure to fracture a file at a 3 mm radius of curvature is significantly less as compared to a 5 mm radius of curvature (HCM > TRN > NE). Conclusion: Within the limitation of the present study, there was a positive correlation between the radius of curvature and fatigue life of NiTi files.

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An in vitro comparative evaluation of cyclic fatigue resistance of two rotary and two reciprocating file systems

Srikumar,

Gadbail,

Alexander

et al. 2024

Journal of Conservative Dentistry and Endodontics

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Context: Root canal instrumentation is one of the important procedures for successful endodontic therapy. Unexpected fracture of files occurs during root canal instrumentation without any visible signs of deformation compromising the success of root canal treatment. Aims: The aim of the study was to evaluate and compare cyclic fatigue resistance (CFR) of rotary and reciprocating files in simulated canals with 45°, 60°, and 90° angle of curvature. Settings and Design: The study design was an In vitro study. Subjects and Methods: Sixty nickel–titanium files, 30 each of rotary and reciprocating files were selected and divided into four groups (n = 15) of Neoendo Flex, ProTaper Next, WaveOne Gold (WOG), and Reciproc Blue (RPB) files. Each group was further subdivided into three subgroups containing five samples each based on their use in simulated canals with 45°, 60°, and 90° angle of curvature. To simulate root canals with 45°, 60°, and 90° angle of curvature, three artificial canals were designed in a stainless steel metal block. Each file was autoclaved, immersed in 3% sodium hypochlorite (NaOCl), and coated with 17% ethylenediaminetetraacetic acid (EDTA). Each file was tested for CFR using a torque-controlled reduction handpiece by instrumenting in a simulated canal for 10 s until fracture. The cycle of autoclaving, exposure to NaOCl, EDTA, and testing of CFR for 10 s per canal as per groups and subgroups was repeated again and again until the respective file fracture. The time taken to file fracture was recorded using a digital chronometer. The time taken for each file fracture (in minutes) was multiplied by the number of rotations per minute to attain the number of cycles to failure (NCF). Statistical Analysis Used: The obtained results were subjected to statistical analysis using one-way analysis of variance and independent t-test. Results: One-way ANOVA test showed a statistically significant difference between the four groups, P < 0.001. Independent “t”-test between individual subgroups showed a statistically significant difference, as P < 0.05. Conclusions: WOG and RPB reciprocating file systems showed superior CFR, more especially in canals with abrupt 90° angle of curvature compared to both rotary file systems tested. Among rotary file systems tested, Neoendo Flex showed greater CFR than ProTaper Next.

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Effect of autoclaving on the cyclic fatigue resistance of nickel-titanium rotary instruments: An in vitro study

Cited by 3 publications

References 22 publications

Ex Vivo Comparison of File Fracture and File Deformation in Canals with Moderate Curvature: Neolix Rotary System versus Manual K-files

Ex Vivo Comparison of File Fracture and File Deformation in Canals with Moderate Curvature: Neolix Rotary System versus Manual K-files

Comparative evaluation of cyclic fatigue resistance of thermomechanically treated NiTi rotary instruments in simulated curved canals with two different radii of curvature: An in vitro Study

An in vitro comparative evaluation of cyclic fatigue resistance of two rotary and two reciprocating file systems

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