Influence of continuous rotation or reciprocation of Optimum Torque Reverse motion on cyclic fatigue resistance of nickel‐titanium rotary instruments

Pedullà, Eugenio; Corsentino, Giacomo; Ambu, Emanuele; Rovai, Fabio; Campedelli, Federico; Rapisarda, Silvia; Rosa, Giusy Rita Maria La; Rapisarda, E; Grandini, Simone

doi:10.1111/iej.12769

Cited by 30 publications

(35 citation statements)

References 41 publications

(71 reference statements)

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“…This result is in agreement with those from previous studies demonstrating that, regardless of the features of the NiTi instruments, the resistance to cyclic fatigue can be increased by operating the instrument in a reciprocating motion, rather than CR (8,19,26,27,16,34). This result is in agreement with those from previous studies demonstrating that, regardless of the features of the NiTi instruments, the resistance to cyclic fatigue can be increased by operating the instrument in a reciprocating motion, rather than CR (8,19,26,27,16,34).…”

Section: Discussionsupporting

confidence: 92%

“…Rotating a large file in the curved canal produces friction and generates an increase in torque demand when instruments are rotated inside an artificial curved canal (19). Rotating a large file in the curved canal produces friction and generates an increase in torque demand when instruments are rotated inside an artificial curved canal (19).…”

Section: Discussionmentioning

confidence: 99%

“…A recent study showed that OTR motion improved significantly the cyclic fatigue resistance of all tested instruments compared to a continuous rotation (19). This motion, Optimum Torque Reverse (OTR), allows the continuous clockwise rotation of the instrument when a minimal load resistance is met.…”

Section: Introductionmentioning

confidence: 99%

“…Also, little information is available regarding the OTR motion (19). Also, little information is available regarding the OTR motion (19).…”

Section: Introductionmentioning

confidence: 99%

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Classification and cyclic fatigue evaluation of new kinematics for endodontic instruments

et al. 2018

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This study evaluated the effect of new motions of the motor TriAuto ZX2 on the cyclic fatigue of endodontic instruments. Vortex Blue 35.06 instruments were divided into four groups (n = 10) and tested for fatigue in a curved artificial canal (90° and 2 mm radius) using the following motions: continuous rotation (CR), Optimum Torque Reverse (OTR) set at 180° and the Optimum Glide Path (OGP), which was tested at 90° and 240°. The time to fracture (TTF) and the lengths of the fractured fragments were recorded. The mean TTF was significantly different among the groups (anova, P < 0.05): OGP 90° (213.39 ± 27.45), OTR 180° (121.24 ± 17.03), OGP 240° (45.24 ± 5.61) and CR (8.43 ± 1.27). Weibull analysis confirmed the shortest life expectancy for CR and the longest survival for OGP at 90°. The resistance to fatigue was affected by motions and pre-set angles. The proprietary movements that are currently available for endodontic instruments were classified according to their kinematics.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Also, little information is available regarding the OTR motion (19). Also, little information is available regarding the OTR motion (19).…”

Section: Introductionmentioning

confidence: 99%

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Classification and cyclic fatigue evaluation of new kinematics for endodontic instruments

et al. 2018

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“…In addition, we tested only reciprocating OTR motion because if we had tested the OTR motion as we tried in our previous methodological trial, the reciprocating OTR motion would begin at different times for each file making the data not directly comparable (20).…”

Section: Discussionmentioning

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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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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Vital Pulp Extirpation

Whitworth¹

2019

Essential Endodontology

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Influence of continuous rotation or reciprocation of Optimum Torque Reverse motion on cyclic fatigue resistance of nickel‐titanium rotary instruments

Abstract: Reciprocation of OTR motion improved significantly cyclic fatigue resistance of all instruments tested compared with continuous rotation. Mtwo and TF had significantly higher cyclic fatigue than the other instruments, in both continuous rotation and reciprocation of OTR motion.

Cited by 30 publications

References 41 publications

Classification and cyclic fatigue evaluation of new kinematics for endodontic instruments

Classification and cyclic fatigue evaluation of new kinematics for endodontic instruments

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

Vital Pulp Extirpation

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