Extended cyclic fatigue life of F2 ProTaper instruments used in reciprocating movement

De‐Deus, Gustavo; Moreira, Edson Jorge Lima; Lopes, Hélio Pereira; Elias, Carlos Nelson

doi:10.1111/j.1365-2591.2010.01756.x

Cited by 275 publications

(295 citation statements)

References 16 publications

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“…Consequently, the reciprocating motion used could explain the higher cyclic fatigue resistance results observed for both instruments tested in reciprocating OTR than continuous rotation. In agreement with the present results, it was reported that reciprocation improves cyclic fatigue resistance of NiTi files compared to continuous rotation (9)(10)(11)(12)29).…”

Section: Discussionsupporting

confidence: 82%

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Influence of Continuous or Reciprocating Optimum Torque Reverse Motion on Cyclic Fatigue Resistance of Two Single-File Nickel-Titanium Rotary Instruments

Pedullà¹,

Corsentino²,

Ambu³

et al. 2017

Eur Endod J

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Objective: Different single-file instruments and kinematics have been introduced on the market. It is important to know the cyclic fatigue performance of these instruments in these new kinematics such as reciprocation of Optimum Torque Reverse (OTR) motion. The aim of this study was to evaluate the resistance to cyclic fatigue of F6 SkyTaper and OneShape used in continuous rotation (proper rotation) or in reciprocating OTR motion. Methods: A total of forty-eight nickel-titanium files were tested. Twenty-four instruments of both brands were divided into two groups (n=12) on the basis of the motion tested: continuous rotation (group 1) or reciprocating OTR motion (group 2). Resistance to cyclic fatigue was determined by recording time to fracture (TtF) in a stainless steel artificial canal with a 60° angle of curvature and 5 mm radius of curvature. Data were analysed by two-way analysis of variance and post-hoc Bonferroni tests for multiple comparisons with P<0.05 as the level of significance. Results: F6 SkyTaper showed higher TtF compared with OneShape, both in continuous and in OTR motion (P<0.0001). The two tested instruments showed higher cyclic fatigue resistance in reciprocating OTR motion than continuous rotation (P<0.0001). Conclusions: OTR motion significantly improves cyclic fatigue resistance of the tested instruments. In addition, F6 SkyTaper showed higher cyclic fatigue resistance than OneShape in both motions.

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Section: Discussionsupporting

confidence: 82%

“…Studies have reported that a reciprocating motion might extend the lifespan of a NiTi instrument, and thus resistance to fatigue, with respect to continuous rotation (9)(10)(11)(12). However, it has also been reported that a reciprocating motion presents some limitations such as major debris transportation toward the apex (13).…”

Section: Highlightsmentioning

confidence: 99%

Influence of Continuous or Reciprocating Optimum Torque Reverse Motion on Cyclic Fatigue Resistance of Two Single-File Nickel-Titanium Rotary Instruments

Pedullà¹,

Corsentino²,

Ambu³

et al. 2017

Eur Endod J

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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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“…The above has relation with the low risk of fracture by torsion because the rotating angles are smaller than deflection angles (Gambarini et al, 2012). Some authors have supported the use of reciprocating motion, concluding that this system showed a higher duration of the NiTi instruments and, therefore, a higher resistance to fatigue when compared with the continuous rotatory system (De-Deus et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

WaveOne: A Simple and Safe Way to Perform an Endodontic Treatment

Aracena

Betancourt

Borie

et al. 2014

Int. J. Odontostomat.

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Variations in the root canal's anatomy play an important role on endodontic therapy success, primarily in teeth with pulp necrosis. Traditionally, the preparation of root canals was performed with the use of stainless steel hand files; but over the years, new flexible instruments were introduced to prevent or minimize iatrogenic errors in shaping the root canal system. In most of recent publications, alternating rotation movements have been proposed as an alternative to continuous rotation in order to reduce the risk of fracture of the instrument and the root canal deformation. The aim of this article was to report a clinical case describing the simple way to perform the endodontic treatment of a maxillary premolar with three root canals, with the WaveOne reciprocating system.

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Extended cyclic fatigue life of F2 ProTaper instruments used in reciprocating movement

Abstract: Movement kinematics is amongst the factors determining the resistance of rotary NiTi instruments to cyclic fracture. Moreover, the reciprocating movement promoted an extended cyclic fatigue life of the F2 ProTaper instrument in comparison with conventional rotation.

Cited by 275 publications

References 16 publications

Influence of Continuous or Reciprocating Optimum Torque Reverse Motion on Cyclic Fatigue Resistance of Two Single-File Nickel-Titanium Rotary Instruments

Influence of Continuous or Reciprocating Optimum Torque Reverse Motion on Cyclic Fatigue Resistance of Two Single-File Nickel-Titanium Rotary Instruments

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

WaveOne: A Simple and Safe Way to Perform an Endodontic Treatment

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