Comparison between a Novel Nickel-Titanium Alloy and 508 Nitinol on the Cyclic Fatigue Life of ProFile 25/.04 Rotary Instruments

Department of Endodontics, Nova Southeastern University College of Dental Medicine, Health Professions Division, Fort Lauderdale, FL 33328, USA.
Journal of endodontics (Impact Factor: 3.38). 11/2008; 34(11):1406-9. DOI: 10.1016/j.joen.2008.07.029
Source: PubMed


ProFile 25/.04 instruments manufactured from three variants of Nitinol (1A, 1B & 2AS) were compared with stock production ProFile 25/.04 instruments and fatigue tested to failure. Cyclic fatigue testing was performed by rotating instruments at 300 RPM in a simulated steel root canal with 5 mm radius and 90 degrees curve until instrument separation. Time to failure was recorded. Torsion testing was undertaken by clamping 3 mm of each instrument tip between brass plates and rotating it at 2 RPM until failure. Data were recorded for torque and angle at fracture. Statistical differences were found with nickel-titanium variant 1B (M-Wire NiTi) nearly 400% more resistant to cyclic fatigue than stock ProFile 25/.04 (P < .001). Torsion testing found differences between all 508 Nitinol groups and M-Wire NiTi (P < .001). ProFile 25/.04 files manufactured from M-Wire NiTi have significantly greater resistance to cyclic fatigue while maintaining comparable torsional properties.

    • "Differences in the surface topography between the endodontic instruments may be related to use of different metal alloys or design features (Castello-Escriva et al., 2012). The NiTi alloy M-Wire exhibits increased resistance to cyclic fatigue (Johnson et al., 2008). However in the present study the WaveOne Primary files that use M-Wire showed more surface irregularities (though not statistically significantly) than the OneShape system which is manufactured of a regular NiTi alloy. "
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    ABSTRACT: The aim of this study was to evaluate the effect of glide path preparation on the surface topography changes of WaveOne and OneShape single files using atomic force microscopy analysis. Two commercially available brands of single file systems were analyzed, including 15 specimens/brand as following: Group I; WaveOne 0.08/25 (Dentsply Maillefer, Ballaigues, Switzerland) and Group II; OneShape 0.06/25 (Micro Mega, Besançon, France). In each group, 3 new files were subjected to AFM analysis as received from manufacturer, and 12 files were analyzed after preparation of root canals. A total of 20 human maxillary molar teeth were selected. In each group, 12 files were divided into 4 subgroups according to instruments that were used in one or three root canals with or without a previous glide path (n = 3). After preparation the surface analysis of single files was performed on 11 different points located along a 3-mm section starting at the tip of each file using AFM. Root mean square (RMS) values were recorded to investigate the surface features of endodontic files. The differences between RMS values were tested by one-way ANOVA. There was no statistically significant difference between the groups (p > 0.05). Creation of a glide path did not affect the surface topography of single file systems. SCANNING 9999:XX–XX, 2014. © 2014 Wiley Periodicals, Inc.
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    • "The WaveOne files are produced with the M-Wire NiTi alloy, using a heat procedure carried out at varying temperatures.[1718] The WaveOne system has a similar tip diameter to the ProTaper files, but WaveOne is used with a reciprocating motion, whereas ProTaper is used with a rotary motion.[18] "
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    ABSTRACT: Objectives: The aim of this study was to compare the canal debridement capabilities of three single file systems, ProTaper, and K-files in oval-shaped canals. Materials and Methods: Seventy-five extracted human mandibular central incisors with oval-shaped root canals were selected. A radiopaque contrast medium (Metapex; Meta Biomed Co. Ltd., Chungcheongbuk-do, Korea) was introduced into the canal systems and the self-adjusting file (SAF), WaveOne, Reciproc, ProTaper, and K-files were used for the instrumentation of the canals. The percentage of removed contrast medium was calculated using pre- and post-operative radiographs. Results: An overall comparison between the groups revealed that the hand file (HF) and SAF groups presented the lowest percentage of removed contrast medium, whereas the WaveOne group showed the highest percentage (P < 0.001). The ProTaper group removed more contrast medium than the SAF and HF groups (P < 0.05). Conclusions: None of the instruments was able to remove the contrast medium completely. WaveOne performed significantly better than other groups.
    Full-text · Article · Jul 2014 · European journal of dentistry
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    • "Resistência torcional e a fadiga cíclica Johnson et al. 14 (2008) "

    Full-text · Chapter · May 2014
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