Elastic Limits in Torsion of Reciprocating Nickel-Titanium Instruments

Ha, Jung-Hong; Kim, Seo Ryeong; Versluis, Antheunis; Cheung, Gary Shun Pan; Kim, Jin Woon; Kim, Hyeon‐Cheol

doi:10.1016/j.joen.2014.12.027

Cited by 17 publications

(16 citation statements)

References 24 publications

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“…, , Ha et al . ). It was also reported that the pre‐set dedicated motor angle for reciprocating systems was lower than the angle at which plastic deformation commences (Kim et al .…”

Section: Discussionmentioning

confidence: 97%

“…Rotational movement of the dedicated motor for Reciproc has been reported to be 170° counterclockwise and 50° clockwise (Ha et al . ). The results of the present study show that the pseudoelastic limit of Reciproc Blue occurs at a higher rotation angle than the 170° pre‐set in dedicated motors and at higher angles than Reciproc.…”

Section: Discussionmentioning

confidence: 97%

“…, Ha et al . ), whilst extending their lifespan and clinical efficiency (De‐Deus et al . , You et al .…”

Section: Introductionmentioning

confidence: 99%

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Safe pseudoelastic limit range under torsional loading with Reciproc Blue

De‐Deus

Versluis

et al. 2018

Int Endodontic J

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“…, , Ha et al . ). It was also reported that the pre‐set dedicated motor angle for reciprocating systems was lower than the angle at which plastic deformation commences (Kim et al .…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

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Safe pseudoelastic limit range under torsional loading with Reciproc Blue

De‐Deus

Versluis

et al. 2018

Int Endodontic J

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“…The results of this study are similar to those of previous studies, despite the limitations of simulated root canals. 18,24,[31][32][33][34][35][36][37]40,41 The method used in this study successfully detected plastic deformations of endodontic instruments. Some plastic deformations were not detected by measuring the dimensions because of the position of the external surface, but were visible under SEM magnification.…”

Section: Discussionmentioning

confidence: 99%

Flute and Shank Dimensions of Reciprocating Instruments before and after Simulated Root Canal shaping

Estrela

Sampaio

Brito

et al. 2017

The Journal of Contemporary Dental Practice

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Aim:This study analyzed the effect of the dimensions of the flute and shank in the first 4 mm of instrument tips on the deformation and dimensional changes of reciprocating instruments after root canal shaping (RCS). Materials and methods:The reciprocating instruments used were Reciproc ® R25, R40, and R50; WaveOne ® Small, Primary, and Large; and Unicone ® #20, #25, and #40. Scanning electron microscopy images of the first 4 mm of the tip were acquired at 30× magnification before and after simulated curved root canals were shaped. Each instrument was used only once. The images were transferred to the AxioVision ® software to measure the flute area (µm 2 ), shank area (µm 2 ), flute length (µm), and crosssectional diameter (µm). Student's t test for paired samples was used to compare differences before and after RCS, and analysis of variance followed by the Tukey test, to compare differences between instruments of similar sizes. The instruments were classified according to deformations after RCS.Results: Reciproc ® instruments had larger flutes and smaller shanks. The Reciproc ® R40 had significant differences in crosssectional diameter at 0.5 mm from the tip. Reciproc ® had no plastic deformations. Unicone ® #20 instruments had significant differences in cross-sectional diameter at 1.5 and 3.0 mm from the tip, and #25 instruments had differences at 1.5 and 3.0 mm and in length of the second and third flutes. One #20 and three #40 instruments had plastic deformations. The differences in length of the first and fourth flutes of WaveOne ® Primary and in cross-sectional diameter at 2.0 mm from the tip of WaveOne ® Large were significant. Two of three WaveOne ® Large instruments had plastic deformations. Conclusion:Reciproc ® instruments had greater flute areas and lengths and smaller shanks than Unicone ® and WaveOne ® instruments of similar sizes. Reciproc ® instruments had a greater flute-to-shank ratio. WaveOne ® instruments had the lowest flute-to-shank ratio. Unicone ® instruments had the most plastic deformations. Instruments with larger flutes and smaller shanks had fewer plastic deformations after curved RCS. Clinical significance:The knowledge of mechanical behavior before choosing the endodontic instrument may avoid fracture, regardless of the clinical condition, and it is essential to the success of root canal treatment.

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“…7 Anatomical variation still represents a major challenge, given the complexity of root canal systems, with isthmuses, irregularities, ramifications, presence of angles and sharpened curvature, which can often lead to accidents and complications, such as perforations, deviations, undulations, and even fractures by endodontic instruments; thus, compromising sterilization during chemical-mechanical preparation and contributing negatively to treatment planning and prognosis. 8 Rotary nickel-titanium instruments have been introduced into the market in order to enhance endodontic treatment, since they have advantages compared to stainless steel instruments, namely: flexibility, shapememory effect, cutting efficacy 9 and super-elastic behavior. 10 However, these instruments are submitted to repetitive cycles, which can result in fracture mainly in curved root canals.…”

Section: Introductionmentioning

confidence: 99%

Use of Reciproc in mandibular premolar with double-curved root canals: a case report

Segundo¹,

Silva²,

Pereira³

et al. 2015

Dental Press Endod

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Introduction: Chemical-mechanical preparation enables antisepsis of the root canal system through the action of chemical substances, being crucial for a favorable prognosis of endodontic treatment. In 2010, two new systems were introduced to the market, aiming at instrumentation by means of the single-file reciprocating technique. Objective: To report a clinical case of endodontic intervention carried out by means of Reciproc R25 instrument. Case report: A Caucasian female patient was referred for endodontic evaluation. Clinical examination showed Class I composite resin restoration and fixed, supported prosthesis between teeth #44 and #45, active fistula, absence of both periodontal pocket and dental mobility. Thermal and electrical pulp sensitivity tests yielded negative results. Radiographic examination revealed both double-curved root canal and diffuse rarefying osteitis. Diagnosis of pulp necrosis and chronic periapical abscess of tooth #44 was established, and endodontic therapy was then instituted. In the first visit, the root canal was biomechanically prepared by means of asymmetric reciprocation with Reciproc R25 files, intracanal dressing with Ca(OH) 2 PA and propylene glycol, and double coronal sealing with coltosol and glass ionomer for 30 days. In the second visit, the root canal system was filled. The patient has been asymptomatic for two years, exhibiting clinical and radiographic evaluations within normality. Conclusions: The Reciproc system contributed decisively to chemical-mechanical preparation, thereby contributing to the success of the proposed clinical case. How to cite this article: Luz Segundo ACS, Silva RV, Pereira RP, Nunes E. Use of Reciproc in mandibular premolar with double-curved root canals: a case report.

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Elastic Limits in Torsion of Reciprocating Nickel-Titanium Instruments

Cited by 17 publications

References 24 publications

Safe pseudoelastic limit range under torsional loading with Reciproc Blue

Safe pseudoelastic limit range under torsional loading with Reciproc Blue

Flute and Shank Dimensions of Reciprocating Instruments before and after Simulated Root Canal shaping

Use of Reciproc in mandibular premolar with double-curved root canals: a case report

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