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

ABSTRACT 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.

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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.
    European journal of dentistry 07/2014; 8(3):326-9. DOI:10.4103/1305-7456.137636
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    • "The very low frequency of R25 instrument fracture reported in the present study can be possibly understood also as an improvement in cyclic fatigue resistance associated with the reciprocation kinematics (Pedull a et al. 2013a,b), the instrument cross-sectional design (Grande et al. 2006, Plotino et al. 2012) and the superelastic M-wire alloy (Johnson et al. 2008). Cross-sectional 'S-shape' design may play a further role to provide great cutting ability to this instrument (B€ urklein et al. 2012, Plotino et al. in press). "
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    ABSTRACT: AimTo investigate the incidence of fracture and deformation observed on Reciproc instruments after clinical use.MethodologyA total of 1696 Reciproc NiTi instruments that were discarded after normal clinical usage over 30 months were collected, 1580 instruments were R25 (93%), 76 were R40 (5%) and 40 were R50 (2%). The treatments included 3780 root canal preparations, 3023 primary treatments and 757 retreatments. Root canal preparation was standardized and followed the manufacturer's directions for use of Reciproc files without any prior glide path with hand instruments. In retreatment cases, Reciproc R25 instrument was used to remove all filling material and to complete the preparation. Each instrument was used for shaping only one tooth. All the instruments used were inspected under a microscope to assay signs of fracture or deformation and, if any fracture existed, the length of the files was measured. Data were analysed using a chi-square test with a level of significance set at P < .05.ResultsA total of 8 Reciproc R25 instruments fractured during treatments, which represents 0.47% of the number of instruments used and 0.21% of the root canals treated. Five instruments fractured in primary treatment cases and three instruments during retreatments. Six Reciproc R25 deformed during clinical use (0.35% of the number of instruments used and 0.15% of the root canals treated), 4 during retreatments and 2 during primary treatments. The deformation reported was unwinding of the blades, one at 1mm from the tip and five between 2 and 3 mm from the tip. No deformations or fracture were registered for the Reciproc R40 and R50 instruments.Conclusions Root canal instrumentation following the manufacturer's instructions can be performed with Reciproc instruments with a very low incidence of instrument fracture and deformation.This article is protected by copyright. All rights reserved.
    International Endodontic Journal 04/2014; 48(2). DOI:10.1111/iej.12302 · 2.97 Impact Factor
    • "It consists of 3 single-use files: Small (International Organization for Standardization [ISO] 21 tip and 6% taper) for fine canals, primary (ISO 25 tip and 8% taper) for the majority of canals and large (ISO 40 and 8% taper) for large canals. The files are manufactured with M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK) NiTi alloy.[12] "
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    ABSTRACT: This study compared the canal curvature modifications after instrumentation with One Shape (Micro Mega) rotary file and Wave One primary reciprocating file (Dentsply Maillefer, Ballaigues, Switzerland). Thirty International Organization for Standardization 15, 0.02 taper, Endo Training Blocks (Dentsply Maillefer) were used. In all specimens working length (WL) was established at the reference point 0. Glide path was achieved with Path-File 1, 2 and 3 (Dentsply Maillefer) at the WL. Group 1 were shaped with One Shape file and group 2 with Wave One files. Pre and post-digital images were superimposed, processed with Corel draw Graphic Suite X5 (Corel Corporation, Ottawa, Canada), Adobe Photoshop CS3 (Adobe Systems Inc., San Jose, CA) and Solid works student Edition software (Dassault Systems Solid Works Corp, S.A., Velizy, France). Mean was more for Wave One compared with One Shape. One-way ANOVA and t-test showed a significant difference between One Shape and Wave One at 5% level of significance (P < 0.05). Canals prepared with Wave One file preserved canal shape, respected the anatomical shape of J-shaped canal and produced a continuously tapered funnel.
    Journal of Conservative Dentistry 03/2014; 17(2):138-41. DOI:10.4103/0972-0707.128049
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