Cyclic fatigue of Reciproc Blue and Reciproc instruments exposed to intracanal temperature in simulated severe apical curvature

İnan, Uğur; Keskin, Cangül; Yilmaz, Özlem Sivas; Baş, Gözde

doi:10.1007/s00784-018-2631-7

Cited by 17 publications

(17 citation statements)

References 29 publications

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“…13,25 Bu ani kurvatürler NiTi eğelerin daha fazla strese maruz kalmasına neden olur ve döngüsel yorgunluğa bağlı kırılmalara yol açabilir. 26 Bu amaçla çalışmamızda 90° kurvatür açısına ve 2 mm kurvatür yarıçapına sahip yapay kanal bu ani kurvatürleri simüle etmek için kullanıldı.…”

Section: Discussionunclassified

North Profa, Reciproc Blue Ve Rotate Döner Si̇stem Ni̇ti̇ Eğeleri̇n Ani̇ Api̇kal Kurvatürlü Kanallarda Döngüsel Yorgunluk Di̇rençleri̇ni̇n Karşilaştirilmasi

Baş

Yüzgüleç

Keskin

et al. 2021

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Bu çalışmanın amacı North Profa RC Blue (25.08), Reciproc Blue (25.08) ve ROTATE (25.06) döner sistem nikel titanyum (NiTi) eğelerin ani apikal kurvatürlü kanallarda ve vücut sıcaklığında döngüsel yorgunluğa bağlı kırılma dirençlerinin karşılaştırılmasıdır. Gereç ve Yöntem: Bu çalışmada on ikişer adet North Profa RC Blue, Reciproc Blue ve ROTATE döner sistem NiTi eğeleri statik model döngüsel yorgunluk deney düzeneğinde, 90° kurvatür açısı ve 2 mm kurvatür yarıçapına sahip paslanmaz çelik yapay kanalda ve 37°C' de kırılıncaya kadar kullanıldı. Eğelerin kırılma zamanı dijital kronometre ile kaydedildi. Kırılan parçaların uzunlukları dijital kumpas kullanılarak ölçüldü. Kırık yüzeyler kırılma tiplerinin belirlenmesi için taramalı elektron mikroskobu (SEM) ile incelendi. Eğelerin faz transformasyon sıcaklıkları ise diferansiyel taramalı kalorimetre (DSC) cihazında analiz edildi. Normal dağılım gösteren veriler tek yönlü ANOVA ve post hoc Tukey testi ile analiz edildi. Bulgular: North Profa RC Blue ve Reciproc Blue eğelerin döngüsel yorgunluk dirençleri arasında anlamlı bir fark olmadığı saptanırken (p> 0.05) her iki grubun döngüsel yorgunluk dirençleri ROTATE grubundan istatistiksel olarak anlamlı derecede yüksek bulundu (p<0.05). Kırık yüzeylerden alınan SEM görüntüleri incelenerek aletlerin döngüsel yorgunluk sonucunda kırıldığı doğrulandı. Sonuç: North Profa RC Blue ve Reciproc Blue eğelerin döngüsel yorgunluk direnci, ROTATE eğelerden daha yüksek bulundu. Eğelerin vücut sıcaklığında hangi fazda bulundukları ve kinematikleri döngüsel yorgunluk direncini etkilemektedir.

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Section: Discussionunclassified

North Profa, Reciproc Blue Ve Rotate Döner Si̇stem Ni̇ti̇ Eğeleri̇n Ani̇ Api̇kal Kurvatürlü Kanallarda Döngüsel Yorgunluk Di̇rençleri̇ni̇n Karşilaştirilmasi

Baş

Yüzgüleç

Keskin

et al. 2021

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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“…However, the intracanal temperature at which the instruments are used during clinical root canal preparation is around 31°C -35°C [7,22]. Recently, few studies have demonstrated that environmental temperature may drastically affect the cyclic fatigue resistance of NiTi instruments [23][24][25]. Therefore, future studies should be performed considering the simulation of environmental temperature when evaluating the influence of autoclave sterilization in the cyclic fatigue resistance of NiTi instruments.…”

Section: Discussionmentioning

confidence: 99%

Influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium instruments: a systematic review

et al. 2020

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Objectives: This systematic review evaluated the influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium (NiTi) instruments. Results: From 203 abstracts, a total of 10 articles matched the eligible criteria. After reading the full articles, 2 were excluded because of the absence of the heat-treated instruments in the experimental design and 3 due to the lack of a control group using heat-treated instruments without autoclave sterilization. From the 5 included studies, 1 presented a low risk of bias, 3 presented moderate and 1 high risk. It was observed heterogeneous findings in the included studies, with autoclave sterilization cycles increasing, decreasing or not affecting the cyclic fatigue life of heat-treated NiTi instruments. However, the retrieved studies evaluating the cyclic fatigue resistance of endodontic instruments presented different protocols and assessing outcomes, this variability makes the findings less comparable within and also between groups and preclude the establishment of an unbiased scientific evidence base. Conclusions: Considering the little scientific evidence and considerable risk of bias, it is still possible to conclude that autoclave sterilization procedures appear to influence the cyclic fatigue resistance of heat-treated NiTi instruments.

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“…RCP properties have been amply studied, but also some studies about the cyclic fatigue resistance of RCPB files are available,[ 3 7 15 22 24 25 26 27 28 29 ] despite their recent introduction into dental market. Unfortunately, it is not possible to directly compare all their data with the results obtained in the present study because of a lack of standardization of the environmental conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Body temperature has a significant effect on the cyclic fatigue resistance. [ 25 29 ] The temperature at which the instruments are tested could influence the results of cyclic fatigue resistance on NiTi files with a different behavior depending on the previous heat treatment of the alloy. [ 30 ] Martensitic transformation of heat-treated NiTi alloy, superelastic behavior, and cyclic fatigue resistance can be affected by the environmental temperature, reducing the fatigue life of the instrument exposed to body temperature.…”

Section: Discussionmentioning

confidence: 99%

“…[ 28 ] In addition, a recent differential scanning calorimetry study on the metallurgical properties of RCPB instruments confirmed their two-stage martensitic transformation below the body temperature, which leads to a softer and more ductile NiTi alloy in the clinical use. [ 25 ] In the present in vitro study, the simulation of the environmental conditions (i.e., simulation of body temperature) was followed to obtain actual results about cyclic fatigue.…”

Section: Discussionmentioning

confidence: 99%

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Influence of different motions on the cyclic fatigue resistance of Reciproc and Reciproc Blue endodontic instruments

Serafin

Biasi²,

Franco

et al. 2019

J Conserv Dent

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Aim: The aim of this study was to evaluate the cyclic fatigue resistance of Reciproc (RCP) and RPC Blue (RCPB) instruments used in continuous rotation, “RECIPROC” mode, and “WAVEONE” mode. Materials and Methods: Sixty RCP and 60 RCPB R25 files were used. For each file type, three groups ( n = 20) were defined depending on the used kinematics: continuous rotation, “RECIPROC” mode, and “WAVEONE” mode. A stainless-steel artificial canal with 60° angle and 5-mm radius of curvature was milled reproducing the size and taper of the used files. The test device was electrically heated to 35°C to simulate the clinical environment. All files were reciprocated or rotated until fracture. The time to failure and the length of the fractured fragments were measured. A fractographic examination was performed by scanning the electron microscopy to confirm the cause of fracture. Collected data underwent a two-way analysis of variance ( α = 0.05). Results: RCPB files exhibited better cyclic fatigue resistance than RCP. The “RECIPROC” motion yielded greater cyclic fatigue resistance than the “WAVEONE” movement; the least resistance was observed in the continuous rotation groups. No significant differences were found among groups in terms of length of the fractured fragment. The fractographic analysis confirmed that all scanned samples separated due to cyclic fatigue. Conclusions: Within the limitation of the present study, the “RECIPROC” mode increased the cyclic fatigue resistance of the tested instruments compared to “WAVEONE” mode and continuous rotation. To prevent RCP and RCPB file separation, motion kinematics other than the native “RECIPROC” movement should be discouraged in the clinical setting.

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Cyclic fatigue of Reciproc Blue and Reciproc instruments exposed to intracanal temperature in simulated severe apical curvature

Cited by 17 publications

References 29 publications

North Profa, Reciproc Blue Ve Rotate Döner Si̇stem Ni̇ti̇ Eğeleri̇n Ani̇ Api̇kal Kurvatürlü Kanallarda Döngüsel Yorgunluk Di̇rençleri̇ni̇n Karşilaştirilmasi

North Profa, Reciproc Blue Ve Rotate Döner Si̇stem Ni̇ti̇ Eğeleri̇n Ani̇ Api̇kal Kurvatürlü Kanallarda Döngüsel Yorgunluk Di̇rençleri̇ni̇n Karşilaştirilmasi

Influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium instruments: a systematic review

Influence of different motions on the cyclic fatigue resistance of Reciproc and Reciproc Blue endodontic instruments

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