Comparison of Conventional and New-generation Nickel-Titanium Files in Regard to Their Physical Properties

Tsujimoto, Masaki; Irifune, Yuu; Tsujimoto, Yasuhisa; Yamada, Sōichiro; Watanabe, Ikuya; Hayashi, Yoshihiko

doi:10.1016/j.joen.2014.06.009

Cited by 40 publications

(25 citation statements)

References 29 publications

(22 reference statements)

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“…In the literature, it was reported that the thermal treatment to the NiTi alloy increased flexibility by changing the composition of phases [14]. In this study, the EM of K3 was significantly higher than that of K3XF and K3H.…”

Section: Discussionmentioning

confidence: 54%

Fracture Resistance of K3 Nickel-Titanium Files Made from Different Thermal Treatments

Choi

Kim

et al. 2016

Bioinorganic Chemistry and Applications

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The purpose of this study was to compare fracture resistances of K3 nickel-titanium files made from different thermal treatments. K3 (SybronEndo, Orange, CA), K3XF (SybronEndo), and experimentally heat treated K3 (K3H) were used. For the cyclic fatigue test, the samples were rotated with up-and-down motion in the artificial canal with the curvature of 60 degrees until the fracture occurred. The number of cycles to fracture (NCF) was measured. For the torsional fracture test, the samples were tightly bound and rotated until the fracture occurred. Elastic modulus (EM), ultimate torsional strength (UTS), and angle of rotation to fracture (ARF) were measured. The results were statistically analyzed by one-way ANOVA. The NCF of K3H was higher than those of K3 and K3XF (P < 0.05). The EM of K3XF and K3H was lower than that of K3 (P < 0.05). There was no significant difference in UTS. The ARF of K3XF was higher than that of K3 (P < 0.05). K3XF and K3H showed more flexibility than K3. The maximum torsional angle of K3XF was higher than that of K3, but there was no significant difference on the UTS in all three groups.

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Section: Discussionmentioning

confidence: 54%

Fracture Resistance of K3 Nickel-Titanium Files Made from Different Thermal Treatments

Choi

Kim

et al. 2016

Bioinorganic Chemistry and Applications

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“…, Tsujimoto et al . ). NiTi rotary instruments have superior flexibility, and their superelasticity decreases the restoring forces, thus allowing enhanced canal shaping and decreased transportation (Gergi et al .…”

Section: Discussionmentioning

confidence: 97%

“…, Tsujimoto et al . ). Flexibility of NiTi rotary instruments is an important property as it reduces the iatrogenic errors that cause canal transportation and improves the root canal preparation (Lopes et al .…”

Section: Introductionmentioning

confidence: 97%

“…Torsional fracture occurs when the tip of the instrument binds in the canal whilst the shank continues to rotate (Parashos & Messer 2006, Lopes et al 2011). Cyclic fatigue is produced by repetitive compressive and tensile stress acting on the outer and inner curves of an instrument rotating in a curved canal (Sattapan et al 2000, Tsujimoto et al 2014. Flexibility of NiTi rotary instruments is an important property as it reduces the iatrogenic errors that cause canal transportation and improves the root canal preparation (Lopes et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Laboratory comparison of the mechanical properties of TRUShape with several nickel‐titanium rotary instruments

Elnaghy

Elsaka

2016

Int Endodontic J

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“…The ProFile Vortex™ product is an M‐Wire file (Gao, Shotton, Wilkinson, Phillips, & Johnson, ), and served as the control. The subsequently marketed ProFile Vortex Blue™ product is an M‐Wire file in which the manufacturer performs a special heat treatment that yields a blue colour from the titanium oxide surface film (Plotino, Grande, Cotti, Testarelli, & Gambarini, ; Tsujimoto et al, ). The ProTaper Gold™ product is also a subsequently marketed M‐Wire file, but subjected to different metallurgical processing (Hieawy, Haapasalo, Zhou, Wang, & Shen, ; Uygun et al, ).…”

Section: Methodsmentioning

confidence: 99%

SEM study of simulated clinical use for four nickel–titanium rotary endodontic files

et al. 2019

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Nickel–titanium (NiTi) rotary endodontic instruments are the major medical devices currently used for root canal therapy. Recently marketed NiTi files are manufactured using thermomechanical processes that improve fatigue resistance and flexibility, which are critical for clinical performance. This study employed a simulated clinical model to compare the wear and fracture of three such rotary instrument products (ProFile Vortex Blue™, ProTaper Gold™ and Coltene HyFlex® CM™), with a previously introduced product (ProFile Vortex™) serving as a control. Files were examined by scanning electron microscope (SEM) at four positions along their length before use and through three simulated clinical procedures on extracted teeth. Wear and deformation were evaluated by two experienced clinicians. Files were categorized as usable, visually unacceptable and microscopically unacceptable, and results were analysed statistically. Three files fractured, and nine files plastically deformed. Many unused instruments were judged to be microscopically unacceptable. There were no significant effects for brand and amount of use for files remaining visibly useful. Microscopically useful instruments were significantly affected by the number of uses. It was concluded that no observed wear or distortion pattern limited multiple file uses and that poorly manufactured surface condition was not necessarily a precursor to failure. Controlled‐memory instruments tended to deform plastically and present minimal fracture risk.

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Comparison of Conventional and New-generation Nickel-Titanium Files in Regard to Their Physical Properties

Abstract: Introduction: The aim of this study was to investigate the surface and

Cited by 40 publications

References 29 publications

Fracture Resistance of K3 Nickel-Titanium Files Made from Different Thermal Treatments

Fracture Resistance of K3 Nickel-Titanium Files Made from Different Thermal Treatments

Laboratory comparison of the mechanical properties of TRUShape with several nickel‐titanium rotary instruments

SEM study of simulated clinical use for four nickel–titanium rotary endodontic files

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