Experimental Evaluation on the Influence of Autoclave Sterilization on the Cyclic Fatigue of New Nickel-Titanium Rotary Instruments

Plotino, Gianluca; Costanzo, Alberto; Grande, Nicola M.; Petrović, Radmila; Testarelli, Luca; Gambarini, Gianluca

doi:10.1016/j.joen.2011.10.017

Cited by 95 publications

(111 citation statements)

References 35 publications

(36 reference statements)

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“…After shaping procedures were completed all the 40 used NiTi instruments were inspected under magnification (3x) to check any sign of plastic deformation or undwinding of flutes. All the instruments were then subjected to cyclic fatigue test using a testing device that was previously described (21)(22)(23)(24)(25)(26)(27). Briefly, all instruments were tested using the TFA motion powered by Elements motor (SybronEndo, Orange, CA, USA).…”

Section: Methodsmentioning

confidence: 99%

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Gambarini

Plotino

Piasecki³

et al. 2015

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SummaryAim. To compare the effect of brushing motion on torsional and cyclic fatigue resistance of TF Adaptive instruments after clinical use. Methods. 20 packs of TFA small sequence (SybronEndo, Orange, CA, USA) were used for this study and divided into two groups. Each instrument prepared one resin tooth, consisting in 4 canals with a complex anatomy. In group A, no brushing motion was performed. In group B, after the green instrument reached the working length, brushing motion with circumferential filing was performed for 15 seconds in each canal (overall 1 minute). All the instruments were then subjected to cyclic fatigue test and mean values and standard deviation for time to fracture were evaluated. Data were subjected to one-way analysis of variance and Bonferroni t-test procedure with a significance set at P < 0.05. Results. No instruments were broken during preparation of root canals. Two TF Adaptive green and 5 yellow showed unwinding after intracanal clinical use. No statistically significant differences were found between green instruments of both groups (P > 0.05), while a statistically significant difference was found between the yellow instruments (P < 0.05), with group B showing an higher resistance to cyclic fatigue. Conclusions. A prolonged passive brushing motion did not adversely affected mechanical resistance of the instrument used for this purpose. Resistance to both deformations and cyclic fatigue of the second instrument within the TFA small sequence was enhanced by the coronal flaring provided by the brushing action of the first instrument used.

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Section: Methodsmentioning

confidence: 99%

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Gambarini

Plotino

Piasecki³

et al. 2015

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“…The study found that K4 prototype instruments showed a significant increase in the mean number of cycles to failure when compared with K3 instruments (1198 AE 279 vs 542 AE 81). Furthermore, the effect of autoclave sterilization on the cyclic fatigue resistance of K3XF was also evaluated by the same research group (86). The results showed that repeated cycles of autoclave sterilization do not seem to influence the cyclic fatigue resistance of K3, Mtwo, or Vortex NiTi instruments.…”

Section: R-phasementioning

confidence: 99%

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Shen

Zhou

Zheng

et al. 2013

Journal of Endodontics

451

438

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Introduction: The performance and mechanical properties of nickel-titanium (NiTi) instruments are influenced by factors such as cross-section, flute design, raw material, and manufacturing processes. Many improvements have been proposed by manufacturers during the past decade to provide clinicians with safer and more efficient instruments. Methods: The mechanical performance of NiTi alloys is sensitive to their microstructure and associated thermomechanical treatment history. Heat treatment or thermal processing is one of the most fundamental approaches toward adjusting the transition temperature in NiTi alloy, which affects the fatigue resistance of NiTi endodontic files. The newly developed NiTi instruments made from controlled memory wire, M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK), or R-phase wire represent the next generation of NiTi alloys with improved flexibility and fatigue resistance. The advantages of NiTi files for canal cleaning and shaping are decreased canal transportation and ledging, a reduced risk of file fracture, and faster and more efficient instrumentation. The clinician must understand the nature of different NiTi raw materials and their impact on instrument performance because many new instruments are introduced on a regular basis. Results: This review summarizes the metallurgical properties of next-generation NiTi instruments, the impact of thermomechanical treatment on instrument flexibility, and the resistance to cyclic fatigue and torsion. Conclusions: The aim of this review was to provide clinicians with the knowledge necessary for evidence-based practices, maximizing the benefits from the selection and application of NiTi rotary instruments for root canal treatment. (J Endod 2013;39:163-172)

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“…30 Çalışmamızda kullandığımız bir diğer enstürman olan K3XF enstür-manı da, aynı R-Phase ısı ve soğutma protokolü ile üretilmesine rağmen, TFA enstürmanı gibi bükülme işlemi yerine tornada kesilme işlemiyle üretilmekte-dir. 31 TF enstürmanı trianguler üçgen kesite sahipken, K3XF enstürmanı, üçlü U şekilli çapraz kesite ve 3 adet radyal alana sahiptir. 32 Çalışmamızın sonucunda TFA enstürmanın K3XF enstrümanına göre preparasyon sonrası oluşan kök dentin dayanımın yüksek olmasını, enstürmanların sahip olduğu farklı çapraz kesit dizaynları ve üretim aşamasındaki burulma ve tornada kesilerek üretilmelerindeki farklılıklardan kaynaklanabileceğini düşünmekteyiz.…”

Section: Discussionunclassified

One Shape New Generati̇on, K3xf, Twi̇sted Fi̇le Adapti̇f Ve Protaper Next Enstrümantasyon Si̇stemleri̇ Kullanimi Sonrasi Kök Denti̇ni̇n Eği̇lme Dayanimi

Zan¹,

HUBBEZOGLU²,

Engin³

et al. 2016

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Experimental Evaluation on the Influence of Autoclave Sterilization on the Cyclic Fatigue of New Nickel-Titanium Rotary Instruments

Cited by 95 publications

References 35 publications

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Deformations and cyclic fatigue resistance of nickel-titanium instruments inside a sequence

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

One Shape New Generati̇on, K3xf, Twi̇sted Fi̇le Adapti̇f Ve Protaper Next Enstrümantasyon Si̇stemleri̇ Kullanimi Sonrasi Kök Denti̇ni̇n Eği̇lme Dayanimi

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