Fatigue Life of Reciproc and Mtwo Instruments Subjected to Static and Dynamic Tests

Lopes, Hélio Pereira; Elias, Carlos Nelson; Vieira, Márcia Valéria Boussada; Siqueira, José F.; Mangelli, Marcelo; Lopes, Weber S.P.; Vieira, Víctor Talarico Leal; Alves, Flávio R.F.; Oliveira, Julio Cezar M.; Soares, Thaiane G.

doi:10.1016/j.joen.2012.11.048

Cited by 101 publications

(86 citation statements)

References 26 publications

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“…In dynamic models, the number of cycles to fracture values increase because the stress is distributed along the length of the shaft during back‐and‐forth movements in the axial direction, whilst the stress is concentrated on one area of the shaft in static models (Lopes et al . ). However, dynamic test models may not actually be that useful in reproducing clinical situations, as clinicians are not able to control a pecking motion of precisely 3 mm when using them.…”

Section: Discussionmentioning

confidence: 97%

Cyclic fatigue resistance of new reciprocating glide path files in 45‐ and 60‐degree curved canals

Topçuoğlu

Kafdağ

et al. 2018

Int Endodontic J

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Section: Discussionmentioning

confidence: 97%

Cyclic fatigue resistance of new reciprocating glide path files in 45‐ and 60‐degree curved canals

Topçuoğlu

Kafdağ

et al. 2018

Int Endodontic J

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“…Moreover, ISO size 25 Mtwo and Reciproc files have a slight difference in the taper (0.06 and 0.08, respectively). However, these files have the same cross-sectional design 2. Thus, it is expected that the minute patient discomfort reported in this study was possibly related to the number of files in the rotary system and the reciprocating movement kinematics used during root canal instrumentation with Reciproc.…”

Section: Discussionmentioning

confidence: 91%

“…The reciprocating motion relieves the stress on the instrument by special counterclockwise (cutting action) and clockwise (release of the instrument) movements and therefore increases its resistance to fatigue in comparison to systems with continuous rotary motion 1. Overall, research findings on reciprocating systems have reported a decrease in preparation time, increased cyclic fatigue life, and a similar shaping ability to rotary systems 2345678. Despite these advantages, during root canal preparation with reciprocating instruments, the clinician can feel a disturbing trepidation associated with a pronounced ‘click sound,’ which raises doubts regarding patients' discomfort during endodontic treatment, especially as a consequence of the kinematics.…”

Section: Introductionmentioning

confidence: 98%

Intraoperative discomfort associated with the use of a rotary or reciprocating system: a prospective randomized clinical trial

et al. 2017

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ObjectivesThe aim of this randomized, controlled, prospective clinical study was to evaluate patients' intraoperative discomfort during root canal preparations in which either multi-file rotary (Mtwo) or single-file reciprocating (Reciproc) systems were used.Materials and MethodsFifty-five adult patients, aged between 25 and 69 years old, with irreversible pulpitis or pulp necrosis participated in this study. Either the mesiobuccal or the distobuccal canals for maxillary molars and either the mesiobuccal or the mesiolingual canals for mandibular molars were randomly chosen to be instrumented with Mtwo multi-file rotary or Reciproc single-file reciprocating systems. Immediately after each canal instrumentation under anesthesia, patient discomfort was assessed using a 1 - 10 visual analog scale (VAS), ranging from ‘least possible discomfort’ (1) to ‘greatest possible discomfort’ (10). The Wilcoxon signed-rank test was used to determine significant differences at p< 0.05.ResultsLittle intraoperative discomfort was found in all cases. No statistically significant differences in intraoperative discomfort between the 2 systems were found (p = 0.660).ConclusionsRoot canal preparation with multi-file rotary or single-file reciprocating systems had similar and minimal effects on patients' intraoperative discomfort.

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“…Cyclic fatigue failure is reported to occur unexpectedly without any sign of a previous permanent plastic deformation. This occurs because of repeated compressive and tensile stresses accumulated at the point of maximum flexure of an instrument rotating in a curved canal [6,7]. Possible strategies to increase the resistance to cyclic fatigue of NiTi rotary instruments include, for example, R-phase heat treatment [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on K3, K3XF and MTwo endodontic files

Fernandes

Oliveira

Machado

et al. 2015

MATEC Web of Conferences

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Abstract. The purpose of this study was to evaluate the effect of heat treatment on the transformation temperatures of K3, K3XF and MTwo endodontic files. DSC was used to investigate the domains of transformation temperatures and how the transformation temperatures vary along the file. The files were analysed as received and subjected to heat treatment. X-ray diffraction analysis was also used to investigate the stress-induced martensite transformation on the files under flexion. The results show that heat treatment influences the transformation temperatures and that under flexion, the conditions and situations in which files present a stress-induced martensite transformation can be identified.

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Fatigue Life of Reciproc and Mtwo Instruments Subjected to Static and Dynamic Tests

Cited by 101 publications

References 26 publications

Cyclic fatigue resistance of new reciprocating glide path files in 45‐ and 60‐degree curved canals

Cyclic fatigue resistance of new reciprocating glide path files in 45‐ and 60‐degree curved canals

Intraoperative discomfort associated with the use of a rotary or reciprocating system: a prospective randomized clinical trial

Effect of heat treatment on K3, K3XF and MTwo endodontic files

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