Effect of different torques in cyclic fatigue resistance of K3 rotary instruments

Kawakami, Dirce Akemi Sacaguti; Candeiro, George Táccio de Miranda; Akisue, Eduardo; Caldeira, Celso Luiz; Gavini, Giulio

doi:10.1590/1677-3225v14n2a05

Cited by 7 publications

(8 citation statements)

References 20 publications

(44 reference statements)

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“…The present findings are consistent with an earlier study that analyzed the effect of various torque levels on the cyclic flexural strength of the K3 instrument 45) . The results indicated that the highest torque value of 6 N•cm led to the lowest number of cycles and time to failure 45) .…”

Section: Discussionsupporting

confidence: 93%

Effect of preset torque setting on torque/force generation, shaping ability and surface changes of nickel titanium rotary instrument in different root canal curvature locations: An <i>ex vivo</i> study

KYAW,

EBIHARA,

IINO

et al. 2024

Dent. Mater. J.

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The aim of this study was to evaluate how preset torque settings influence the torque, vertical force, and root canal-centering ability of ProGlider and ProTaper NEXT nickel-titanium rotary instruments in canals with different curvature locations. Based on microcomputed tomography, mesial roots of human mandibular molars (25°-40° curvature) were allocated to the apical curvature (apical 1-5 mm) or the middle curvature (apical 5-9 mm) groups, and mandibular incisors (curvature <5°) to the straight canal group. Each group was subjected to automated instrumentation and torque/force measurement with the preset torque of 1, 2.5, or 5 N•cm. Canalcentering ratios were determined with micro-computed tomography. Instrument fracture occurred only in the 2.5 and 5 N•cm groups in curved canals. The preset torque setting and curvature location did not influence canal shaping ability.

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Section: Discussionsupporting

confidence: 93%

Effect of preset torque setting on torque/force generation, shaping ability and surface changes of nickel titanium rotary instrument in different root canal curvature locations: An <i>ex vivo</i> study

KYAW,

EBIHARA,

IINO

et al. 2024

Dent. Mater. J.

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“…The custom-made dynamic testing device used to test flexural fatigue resistance in this study simulated a curved canal with a 40-degree and 5 mm radius curvature, and was used in similar studies (13,26). Some ex vivo studies found that conventional reciprocating motion improved the resistance to flexural fatigue of NiTi files used for root canal preparation (13,16,17).…”

Section: Discussionmentioning

confidence: 99%

Optimum glide path motion is safer than continuous rotation of files in glide path preparation

et al. 2021

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This study evaluated the resistance to flexural fatigue and torsional strength of files for glide path preparation in continuous rotation or Optimum Glide Path motion (OGP). ScoutRace 15.02 and ProGlider 16.02 files were used in a dynamic testing device during preparation of simulating curved root canals (40-degree curvature and 5 mm radius). For the torsional test, a machine was used to test torsion measured maximum torsional strength (N.cm). Two-way ANOVA and Tukey's multiple comparisons test were used for statistical analysis. Files in OGP motion had a statistically better resistance to flexural fatigue (P < 0.05). ProGlider files took longer time to failure than ScoutRace files only when OGP was used (P < 0.05). The torsional test revealed that OGP produced significantly less torsional stress than rotary motions for both types of glide path files (P < 0.05) In conclusion, OGP motion increased substantially the mechanical safety of endodontic glide path files.

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“…These systems have been designed to prepare root canals in motion with specific torque and speed values prolonging the life span of the files by reducing the maximum stress on their surfaces caused by the continuous tension used in static motion models (Kawakami et al 2015). The pecking amplitude provides a time interval before the instruments are once again subjected to the highest stressed area.…”

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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Effect of different torques in cyclic fatigue resistance of K3 rotary instruments

Cited by 7 publications

References 20 publications

Effect of preset torque setting on torque/force generation, shaping ability and surface changes of nickel titanium rotary instrument in different root canal curvature locations: An <i>ex vivo</i> study

Effect of preset torque setting on torque/force generation, shaping ability and surface changes of nickel titanium rotary instrument in different root canal curvature locations: An <i>ex vivo</i> study

Optimum glide path motion is safer than continuous rotation of files in glide path preparation

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

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