Cyclic Fatigue Resistance of Rotary NiTi Instruments after Simulated Clinical Use in Curved Root Canals

Pessoa, Oscar Facíola; Silva, Juliana Melo da; Gavini, Giulio

doi:10.1590/0103-6440201302164

Cited by 24 publications

(22 citation statements)

References 22 publications

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“…Cutting edges with alternating matter can avoid the screwing effect and working with low torque. This instrument can create centered canal shapes with enough clean and shaped canals (24) .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Effect of Irrigating Solutions on Push out Bond Strength of Bio-ceramic and Resin Based Endodontic Sealers

2019

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Purpose: This study was designed to evaluate the impact of irrigating solutions on push out bond strength of Bio-ceramic and resin based endodontic sealers. Materials and Methods: sixty extracted human teeth with single root and single canal were prepared with RACE FKG rotary files (#35, 0.06) taper. The specimens were divided into two experimental groups according to the final rinse used (30 samples each): Group (I) irrigated with 17%EDTA, Group (II) irrigated with 2% Chlorohexidinedigluconate (CHX). Each group was subdivided into two subgroups according to the sealer used (15 samples each). Total Fill Bio-ceramic sealer, and AH Plus Sealer The specimens were obturated by single cone gutta-percha with vertical condensation technique. Results: Final irrigation with EDTA resulted in the highest bond strength of bioceramic sealer to dentin of the root which was statistically different from irrigation with chlorohexidinedigluconate (CHX). Bond strength values were as follows: EDTA>CHX. Conclusion: The type of final irrigation affects the adhesion of Total Fill Bio-ceramic and AH plus sealers to root canal dentin.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Effect of Irrigating Solutions on Push out Bond Strength of Bio-ceramic and Resin Based Endodontic Sealers

2019

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“…Continuous cycles of traction and compression in curved canals are reported to increase the cyclic fatigue and fracture of endodontic files (Melo et al 2002, Zelada et al 2002, Pessoa et al 2013.…”

Section: Kinematics Of Movement and Instrument Fracturementioning

confidence: 99%

“…The relationship between cyclic fatigue and the dynamics of the forces exerted by NiTi rotary files on root canals during experimental canal preparation has been poorly discussed. Previous reports have reported that dynamic pecking motion tests are the Kinematics and cyclic fatigue of NiTi instruments Ferreira et al most suitable for cyclic fatigue investigations when using rotary NiTi files, as static tests are not able to reproduce the real conditions faced in clinical practice such as automated instrumentation systems (Yared et al 2000, Pessoa et al 2013).…”

Section: Kinematics Of Movement and Instrument Fracturementioning

confidence: 99%

Movement kinematics and cyclic fatigue of NiTi rotary instruments: a systematic review

et al. 2016

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The aim of this review was to provide a detailed analysis of the literature concerning the correlation between different movement kinematics and the cyclic fatigue resistance of NiTi rotary endodontic instruments. From June 2014 to August 2015, four independent reviewers comprehensively and systematically searched the Medline (PubMed), EMBASE, Web of Science, Scopus and Google Scholar databases for works published since January 2005, using the following search terms: endodontics; nickel-titanium rotary files; continuous rotation; reciprocating motion; cyclic fatigue. In addition to the electronic searches, manual searches were performed to include articles listed in the reference sections of high-impact published articles that were not indexed in the databases. Laboratory studies in English language were considered for this review. The electronic and manual searches resulted in identification of 75 articles. Based on the inclusion criteria, 32 articles were selected for analysis of full-text copies. Specific analysis was then made of 20 articles that described the effects of reciprocating and continuous movements on cyclic fatigue of the instruments. A wide range of testing conditions and methodologies have been used to compare the cyclic fatigue resistance of rotary endodontic instruments. Most studies report that reciprocating motion improves the fatigue resistance of endodontic instruments, compared to continuous rotation, independent of other variables such as the speed of rotation, the angle or radius of curvature of simulated canals, geometry and taper, or the surface characteristics of the NiTi instruments.

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“…The results of mean deformation scores that recorded in the present study are supported by the results of deformation percentage, where TFA instruments used with reciprocating motion produced the lowest deformation percentage (10%) followed by TFA instruments used with adaptive motion (30%) while the highest deformation percentage was recorded in TFA instruments used with continuous rotation motion (40%). The highest mean deformation scores and deformation percentage recorded with the continuous rotation motion could be explained by increased instrument experiences in tension/compression during rotation at the point of greatest curvature, which increase the cyclic fatigue and separation of endodontic files (29,30) . Moreover, it has been reported that, the continuous rotation motion is leading cause of NiTi instrument failure, with deformation, metal fatigue and subsequent breakage being potential problems associated with the use of 360 rotary instruments in curved canals (31) .…”

Section: Discussionmentioning

confidence: 99%

Impact of Different Movement Kinematics on the Deformation of TF Adaptive Files

2019

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Purpose: This study was designed to evaluate the effect of different movement kinematics on the deformation of TF Adaptive files using Dental Operating Microscope (DOM) and Scanning Electron Microscope (SEM). Materials and Methods: One hundred and eighty extracted human mandibular molars were selected with curved mesiobuccal canal (15º-35º). Thirty new sets of TF Adaptive files were divided into 3 groups according to the movement kinematics used (10 instruments each). Group I: 60 samples were instrumented with 10 TF Adaptive files in adaptive motion with TF Adaptive program Elements motor. Group II: 60 samples were instrumented with 10 TF Adaptive files in reciprocating motion with built-in reciprocating EndoEst motor mini, where the angle of reciprocation was set at 160° CCW and 41°CW. Group III: 60 samples were instrumented with10 TF Adaptive files in continuous rotation motion at 500rpm and torque 2 N/cm. Instruments were examined under DOM before usage and after each use for evaluation of deformation or fracture. Selected instruments from each group were evaluated using SEM. Results: there was no statistical significant difference among adaptive motion, reciprocating and continuous rotation motion in the mean deformation scores and percentage. The highest deformation scores and percentage was recorded in TF Adaptive instruments used with continuous rotation motion, however, there was no statistical significant difference. Conclusion: The innovated adaptive motion did not result in lower deformation of TF Adaptive files. Reciprocating motion produced less deformation in TF Adaptive files than did adaptive motion or continuous rotation motion, after preparing six root canals.

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Cyclic Fatigue Resistance of Rotary NiTi Instruments after Simulated Clinical Use in Curved Root Canals

Cited by 24 publications

References 22 publications

Evaluation of the Effect of Irrigating Solutions on Push out Bond Strength of Bio-ceramic and Resin Based Endodontic Sealers

Evaluation of the Effect of Irrigating Solutions on Push out Bond Strength of Bio-ceramic and Resin Based Endodontic Sealers

Movement kinematics and cyclic fatigue of NiTi rotary instruments: a systematic review

Impact of Different Movement Kinematics on the Deformation of TF Adaptive Files

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