Fatigue Testing of Controlled Memory Wire Nickel-Titanium Rotary Instruments

Shen, Ya; Qian, Wei; Abtin, Houman; Gao, Yuan; Haapasalo, Markus

doi:10.1016/j.joen.2011.03.023

Cited by 161 publications

(191 citation statements)

References 25 publications

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“…The ProGlider file used in this study is manufactured from M-wire NiTi alloy while G-Files are made from conventional NiTi. Heat-treated M-wire alloy has a control memory feature that makes this alloy extremely flexible and more resistant to cyclic fatigue than non-control memory NiTi alloy (32). The performance of G-Files at Dmc in the present study may also be due to the constant 3% taper or the noncutting tips.…”

Section: Resultsmentioning

confidence: 73%

Comparison of Canal Transportation and Centering Ability of K-files, ProGlider File, and G-Files: A Micro-Computed Tomography Study of Curved Root Canals

Paleker

Vyver

2016

Journal of Endodontics

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Highlights• Micro-CT comparisons of centering ability and apical canal transportation of 3 glide path enlargement techniques in curved root canals of extracted mandibular molars.• K-files were least centered and caused more transportation.• ProGlider displayed superior centering ability.• ProGlider and G-Files caused significantly less transportation than K-files. AbstractIntroduction: The purpose of this study was to compare centering ability and apical

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Section: Resultsmentioning

confidence: 73%

Comparison of Canal Transportation and Centering Ability of K-files, ProGlider File, and G-Files: A Micro-Computed Tomography Study of Curved Root Canals

Paleker

Vyver

2016

Journal of Endodontics

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“…Reciprocating instrumentation is a new and promising method for the mechanical disinfection of root canals, and as with the M-Wire NiTi alloy, allows the root canal to be prepared with a single instrument. Some studies have evaluated the mechanical effectiveness of these instruments using mechanical tests, 16,17,22,23,24 and have reported the great potential these new concepts have in overcoming the challenges presented during root canal manipulation, such as curvatures. 15,22 However, simplification of endodontic treatment using only one instrument raises concerns about its effectiveness in promoting proper disinfection of the root canal system.…”

Section: Discussionmentioning

confidence: 99%

Ex vivo evaluation of three instrumentation techniques on E. faecalis biofilm within oval shaped root canals

et al. 2015

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Ex vivo evaluation of three instrumentation techniques on E. faecalis biofilm within oval shaped root canals Abstract: The objective of the present study was to assess the effectiveness of reciprocating instrumentation in disinfecting oval-shaped root canals infected with Enterococcus faecalis. Forty-five human lower premolars were infected with a culture of E. faecalis (ATCC 29212) for 28 days. Five other teeth that were neither contaminated nor instrumented were used as controls. The 45 specimens were divided into three experimental groups (n = 15) based on the root canal preparation technique used: manual (K-type, Dentsply Maillefer, Ballaigues, Switzerland); rotary (MTwo, VDW GmbH, Munich, Germany); and reciprocating (Reciproc R50, VDW GmbH, Munich, Germany) instruments. During chemomechanical preparation, 21 mL of 2.5% NaOCl was used as the irrigating solution. Microbiological sampling was performed before (S1) and immediately after (S2) the chemomechanical preparation using sterilized paper points. Specimens were then cleaved, and 0.02 g of dentine chips was collected from the root thirds to verify the presence of microorganisms in dentinal tubules. All three preparation techniques reduced the number of microorganisms in the root canal lumen and dentine chips from the root thirds, but no significant differences were observed between the three groups (p > 0.05). Reciprocating instrumentation with Reciproc R50 was effective in reducing the number of microorganisms within the root canal system. Although this technique involves the use of only one file to perform the root canal therapy, it is as effective as conventional rotary instrumentation in reducing the E. faecalis biofilm from the root canal system. However, further clinical investigations are warranted in order to ratify these results.

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“…CM Wire instruments had a higher number of multiple-crack origins than conventional NiTi wire files of the same design, especially NEYY CM instruments (92% files with multiple-crack origins). Nearly all of the specimens showed fatigue crack initiation at 1 or more cutting edges of the fracture crosssection unless a subsurface void or inclusion was present elsewhere (39). The values of the fracture area occupied by the dimple region (showing the final fracture) were significantly smaller on NiTi instruments made from CM Wire than on instruments made from conventional NiTi wire ( Fig.…”

Section: Wirementioning

confidence: 92%

“…The explanation for this may be that heating transforms the metal temporarily into the austenitic phase and makes it SE, which makes it possible for the file to regain its original shape before cooling down again. The properties of the bulk materials are the main determinant of fatigue life (35)(36)(37)(38)(39)(40)(41)(42) (42)(43)(44)(45). The conventional SE NiTi file has an austenite structure (26,(42)(43)(44)(45)(46), whereas NiTi file with thermal processing (eg, TYP CM and Vortex) would essentially be in the martensite condition at body temperature (42,44,45,47).…”

Section: Metallurgical Characterization Of Thermomechanically-treatedmentioning

confidence: 99%

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Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Shen

Zhou

Zheng

et al. 2013

Journal of Endodontics

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458

438

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Introduction: The performance and mechanical properties of nickel-titanium (NiTi) instruments are influenced by factors such as cross-section, flute design, raw material, and manufacturing processes. Many improvements have been proposed by manufacturers during the past decade to provide clinicians with safer and more efficient instruments. Methods: The mechanical performance of NiTi alloys is sensitive to their microstructure and associated thermomechanical treatment history. Heat treatment or thermal processing is one of the most fundamental approaches toward adjusting the transition temperature in NiTi alloy, which affects the fatigue resistance of NiTi endodontic files. The newly developed NiTi instruments made from controlled memory wire, M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK), or R-phase wire represent the next generation of NiTi alloys with improved flexibility and fatigue resistance. The advantages of NiTi files for canal cleaning and shaping are decreased canal transportation and ledging, a reduced risk of file fracture, and faster and more efficient instrumentation. The clinician must understand the nature of different NiTi raw materials and their impact on instrument performance because many new instruments are introduced on a regular basis. Results: This review summarizes the metallurgical properties of next-generation NiTi instruments, the impact of thermomechanical treatment on instrument flexibility, and the resistance to cyclic fatigue and torsion. Conclusions: The aim of this review was to provide clinicians with the knowledge necessary for evidence-based practices, maximizing the benefits from the selection and application of NiTi rotary instruments for root canal treatment. (J Endod 2013;39:163-172)

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Fatigue Testing of Controlled Memory Wire Nickel-Titanium Rotary Instruments

Cited by 161 publications

References 25 publications

Comparison of Canal Transportation and Centering Ability of K-files, ProGlider File, and G-Files: A Micro-Computed Tomography Study of Curved Root Canals

Comparison of Canal Transportation and Centering Ability of K-files, ProGlider File, and G-Files: A Micro-Computed Tomography Study of Curved Root Canals

Ex vivo evaluation of three instrumentation techniques on E. faecalis biofilm within oval shaped root canals

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

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