Fatigue Resistance of Engine-driven Rotary Nickel-Titanium Instruments Produced by New Manufacturing Methods

Gambarini, Gianluca; Grande, Nicola M.; Plotino, Gianluca; Somma, Francesco; Garala, Manish; Luca, Massimo De; Testarelli, Luca

doi:10.1016/j.joen.2008.05.007

Cited by 315 publications

(338 citation statements)

References 26 publications

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“…However, the difference was not statistically significant (P > 0.05).The lower degree of changes in the angle and radius of curvature produced by TF could be attributed to the cervical pre-flaring, which reduces the instrument's friction with the root canal walls. In addition, the new manufacturing method of the TF instruments (R-phase heat treatment, twisting of the metal, and the surface deoxidation), resulting in increased phase transformation temperatures and increased flexibility of TF files compared with the other NiTi instruments manufactured by grinding as OS file instrument (4,6,19,(24)(25)(26) .…”

Section: Discussionmentioning

confidence: 99%

“…It has a variable pitch that minimizes the "screw-in" effect and allows debris to be effectively channeled out of the canal (5) .Twisted File has been reported to be the most flexible instrument, with a significant improvement in flexibility ranging from 100% to 250%, which cut dentin efficiently with more uniform cutting, compared to machined nickeltitanium endodontic files (6,7) . Canal transportation and centering ratio has been evaluated in root canals with severe curvature and short radius using (TF), Pathfile-ProTaper (PP) and conventional stainless steel K-files.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Root Canal Transportation and Centering Ability Prepared with Two Single Files Rotary Systems using Cone Beam Computed Tomography Scanning (Ex vivo study)

2017

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Root Canal Transportation and Centering Ability Prepared with Two Single Files Rotary Systems using Cone Beam Computed Tomography Scanning (Ex vivo study)

2017

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“…Thus, it might be assumed that the incidence of dentinal defects would be increased compared with preparations using full-sequence rotary systems [6][7][8][9][10].…”

Section: Brazilian Research Inmentioning

confidence: 99%

“…They are able to prepare canals with only one instrument, requiring less time than rotary full-sequence systems [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Prevalence of Dentinal Defects after Root Canal Preparations in Molars with Reciproc and WaveOne Systems

Amaral

Santos

Salazar-Silva

et al. 2016

Pesqui. bras. odontopediatria clín. integr.

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Objective: To evaluate the prevalence of dentin defects, including partial and complete cracks and fractures, after root canal preparation in molars with Reciproc and WaveOne reciprocating instruments. Material and Methods: Fifty mandibular first and second molars with mature apices were selected to endodontic in vitro instrumentation. Ten teeth were unprepared and served as the control, and the remaining forty teeth were divided into two groups, being twenty corresponding to each reciprocating system. Reciproc and WaveOne systems were used in a reciprocating working motion, under the same conditions, to prepare the two mesial canals. Roots were then sectioned 2, 4 and 6 mm from the apex, and the cut surface was observed under a microscope using 20-fold magnification and checked for the presence of fractures and incomplete cracks. Results: none of the evaluated groups presented fractures, and the control group showed no incomplete cracks. Overall evaluation showed statistical differences between these two groups and the control group (p=0.017) for the prevalence of incomplete cracks, but no significant differences were obtained between Reciproc and WaveOne groups (p>0.05). Reciproc group presented more incomplete cracks on 4-mm sections compared with the control group on the same section (p=0.0326). Conclusion: Root canal preparation with both reciprocating instruments resulted in incomplete cracks, but not fractures. At the level of 4 mm from the apex of the canals, the Reciproc system produced significantly more incomplete cracks. Considering both systems, WaveOne utilization resulted in lesser structural alterations on dentin considering the middle portion of the roots.

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“…[7][8][9][10] Many variables, such as the operational speed, the metal surface treatment and the metallurgic characterization of the NiTi alloys that could possibly influence the fatigue resistance of NiTi rotary files have been investigated. 11 Canal curvature is suspected to be the predominant risk factor for instrument failure because of flexural stresses and cyclic fatigue. 2,12,13 One additional factor potentially limiting resistance to fatigue fracture is corrosion that may occur in the presence of NaOCl solution.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Fatigue Resistance of Three Single-use NiTi Instruments after Immersion in Sodium Hypochlorite

Dagna¹,

Beltrami²,

Colombo³

et al. 2014

International Journal of Experimental Dental Science

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The aim of this in vitro study was to compare the cyclic fatigue resistance of three single-use nickel-titanium (NiTi) instruments (One Shape, Reciproc and Wave One) after immersion in sodium hypochlorite (NaOCl) solution over several time periods. A total of 135 One Shape, Reciproc R25 and Wave One Primary were tested. The 45 files of the same brand were randomly assigned to three groups (n = 15) and submitted to the following immersion protocol: 1 minute in 5% NaOCl at 37ºC, 5 minutes in 5% NaOCl at 37ºC, no immersion (as control). Cyclic fatigue test was performed rotating/reciprocating all instruments in a stainless steel curved artificial canal (60º angle of curvature and 5 mm radius). The number of cycles to fracture (NCF) was determined by measuring the time to fracture. The data were compared for differences by using 2-way analysis of variance (p < 0.05). In general, resistance to cyclic fatigue was not significantly affected by immersion in NaOCl. Reciproc R2 showed the highest cyclic fatigue resistance in all groups compared to One Shape and Wave One. Immersion in NaOCl for 1 or 5 minutes did not reduce the cyclic fatigue resistance of NiTi single-use instruments significantly. Reciproc were more resistant, but the new rotary single-use One Shape instruments showed mechanical resistance similar to NiTi files developed for reciprocating motion.

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Fatigue Resistance of Engine-driven Rotary Nickel-Titanium Instruments Produced by New Manufacturing Methods

Cited by 315 publications

References 26 publications

Comparison of Root Canal Transportation and Centering Ability Prepared with Two Single Files Rotary Systems using Cone Beam Computed Tomography Scanning (Ex vivo study)

Comparison of Root Canal Transportation and Centering Ability Prepared with Two Single Files Rotary Systems using Cone Beam Computed Tomography Scanning (Ex vivo study)

Prevalence of Dentinal Defects after Root Canal Preparations in Molars with Reciproc and WaveOne Systems

Cyclic Fatigue Resistance of Three Single-use NiTi Instruments after Immersion in Sodium Hypochlorite

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