Cyclic fatigue resistance of three heat-treated nickel-titanium instruments at simulated body temperature

Elsewify, Tarek; Saber, Shehabeldin Mohamed; Plotino, Gianluca

doi:10.4103/sej.sej_122_19

Cited by 10 publications

(9 citation statements)

References 30 publications

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“…There was no significant effect of temperature on the cyclic fatigue resistance of all systems. The results might be attributed to the difference in manufacturing mode and heat treatment of files, which is consistent with previous studies who proved that the electrical discharge machining process by which the EDM file is manufactured decreased the surface defects on the instrument and the manufacturing stresses on the instrument which in turn increased the cyclic fatigue resistance (26). M-Pro files showed the least cyclic fatigue resistance despite that the files fractured at D3 to D4 at which, the HyFlex EDM has a rectangular crosssection and 8% taper, The Denjoy i3Gold has triangular cross-section and 4% taper while the M-Pro has a convex triangular cross-section and 4% taper, that gives Denjoy i3Gold files less metal mass and less stress concentration which supposed to increase the cyclic fatigue resistance.…”

Section: B Differential Scanning Calorimetrysupporting

confidence: 91%

Evaluation of cyclic fatigue of three different Rotary Nickel Titanium Systems

Fouad

Hashem

Aziz

2021

Ain Shams Dental Journal

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To overcome the inconveniences of manual filing systems, nickel-titanium (NiTi) rotary shaping techniques were developed. The study was conducted to evaluate the cyclic fatigue resistance and martensitic/austenitic phase at body and room temperatures for HyFlex EDM, M-Pro, Denjoy i3Gold files.Twenty files of each system were used. Ten of them were used at room temperature and ten were used at body temperature. Dynamic cyclic fatigue testing was performed with a specific device, which allowed the instruments to rotate freely inside a Stainless-Steel artificial canal while providing an axial movement with amplitude of 3mm up and down movement. The number of cycles to failure (NCF) was calculated. A Sample with weight 10 to 15 gm of each instrument was evaluated using DSC. The DSC analyses were conducted over a temperature ranging from 0o C to 60o C.The results showed higher cyclic fatigue of HyFlex EDM followed by Denjoy i3Gold and M-Pro showed the lowest values for both room and body temperatures. Temperature showed no effect on cyclic fatigue for all instruments within this study. The differential scanning calorimetry confirmed the presence of the martensitic phase in Hyflex EDM, M-Pro and Denjoy i3Gold at room temperature and body temperature.

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Section: B Differential Scanning Calorimetrysupporting

confidence: 91%

Evaluation of cyclic fatigue of three different Rotary Nickel Titanium Systems

Fouad

Hashem

Aziz

2021

Ain Shams Dental Journal

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“…The reasons for exclusion are documented in Supplymentary Table 2 . [ 42 43 44 45 46 ] In the event of a disagreement, a third reviewer (AL) was consulted.…”

Section: Methodsmentioning

confidence: 99%

Effect of body temperature on the cyclic fatigue resistance of the nickel”titanium endodontic instruments: A systematic review and meta-analysis of in vitro studies

et al. 2022

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Aim: The aim of this systematic review was to compare the effect of body temperature (I) on the cyclic fatigue resistance (O) of nickel–titanium (NiTi) endodontic instruments (P) to that of room temperature (C). Methods: The study was registered in the PROSPERO database (CRD42020204286). A systematic search in PubMed, Scopus, Web of Science, Google Scholar, and OpenGrey was conducted in English until December 31, 2021. In vitro studies comparing the cyclic fatigue resistance of NiTi instruments at the body (35°C ± 2°C) and room temperature (20°C–25°C) were included. Eligible studies were evaluated for risk of bias and meta-analyzed to estimate the effects. Results: Twenty-one studies out of 347 met the criteria for inclusion. The meta-analysis included six studies ( n = 215) with comparative study parameters. The overall effect sizes (5.49; 95% confidence interval [CI]: 4.04–6.93) were significantly different ( P < 0.001), indicating that the mean values at room temperature were significantly ( P < 0.001) higher. The effect sizes for full rotary motion (standardized mean difference [SMD]: 4.80; 95% CI: 3.04–6.56) and reciprocating motion (SMD: 6.37; 95% CI: 3.63–9.11) were not significantly different ( P = 0.346). Heterogeneity was high ( I 2 = 94%). Sensitivity analysis revealed that the SMD values were not significantly different ( P > 0.05) from the overall effect size, indicating that none of the studies had an effect on the overall effect size. Conclusions: Within the limitation of the study, the cyclic fatigue resistance of heat-treated NiTi endodontic files is significantly reduced at body temperature when compared to room temperature. Cyclic fatigue testing should be conducted at simulated body temperature.

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“…The files have convex triangular cross section with three cutting edges and non-cutting tip which claimed to increase cutting efficiency and reducing risk of apical transportation. (4) The ProTaper is a file used in rotational motion. It's convex triangular cross-section enhances cutting action while decreasing rotational friction between the blade of the file and dentin.…”

Section: Discussionmentioning

confidence: 99%

Debris Extrusion of Three Nickel-Titanium Rotary Instruments Using Different Irrigation Protocols (In Vitro Study)

Ebeid¹,

Elfaramawy²,

Yehia³

2022

Egyptian Dental Journal

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Background: One of the main objectives of the root canal treatment is the shaping and cleaning of the root canal without changing the outline of the root canal from the preoperative shape. Nickel Titanium files are some of tools used in producing proper cleaning and shaping of the canal. These files have different designs and type of motion that vary in its shaping and cleaning ability.Objective: To evaluate the debris extrusion of dentin after the use of 3 different NiTi filling systems with different irrigations. Materials and Methods:This study was concerned with comparing and evaluation the amount of apical extrusion of debris after preparation with three files systems using quantitative method by pre and post preparation weighting of the tubes collecting the apically extruded debris during the canal preparation.Results: These results might be due to the viscosity of MTAD which is higher than hypochlorite. This may cause entrapment of the dentin debris inside the canal and prevent its extrusion from the apex and the great taper of M Pro files (25# .06 taper) with it's rotational movement so it touch all the canal walls with a great dentine removal. Conclusion:In view of the results of the present study, the following conclusions can be drawn: Highest debris extrusion produced with using M-pro files. NaOCl produced more cleaning and shaping than MTAD than Saline. Lowest debris extrusion produced with using 2shape files.

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Cyclic fatigue resistance of three heat-treated nickel-titanium instruments at simulated body temperature

Cited by 10 publications

References 30 publications

Evaluation of cyclic fatigue of three different Rotary Nickel Titanium Systems

Evaluation of cyclic fatigue of three different Rotary Nickel Titanium Systems

Effect of body temperature on the cyclic fatigue resistance of the nickel”titanium endodontic instruments: A systematic review and meta-analysis of in vitro studies

Debris Extrusion of Three Nickel-Titanium Rotary Instruments Using Different Irrigation Protocols (In Vitro Study)

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