A Multimethod Assessment of a New Customized Heat-Treated Nickel–Titanium Rotary File System

Abstract

This study aimed to compare three endodontic rotary systems. The new Genius Proflex (25/0.04), Vortex Blue (25/0.04), and TruNatomy (26/0.04v) instruments (n = 41 per group) were analyzed regarding design, metallurgy, and mechanical performance, while shaping ability (untouched canal walls, volume of removed dentin and hard tissue debris) was tested in 36 anatomically matched root canals of mandibular molars. The results were compared using one-way ANOVA, post hoc Tukey, and Kruskal–Wallis tests, with a significance level set at 5%. All instruments showed symmetrical cross-sections, with asymmetrical blades, no radial lands, no major defects, and almost equiatomic nickel–titanium ratios. Differences were noted in the number of blades, helical angles, cross-sectional design, and tip geometry. The Genius Proflex and the TruNatomy instruments had the highest and lowest R-phase start and finish temperatures, as well as the highest and lowest time and cycles to fracture (p < 0.05), respectively. The TruNatomy had the highest flexibility (p < 0.05), while no differences were observed between the Genius Proflex and the Vortex Blue (p > 0.05). No differences among tested systems were observed regarding the maximum torque, angle of rotation prior to fracture, and shaping ability (p > 0.05). The instruments showed similarities and differences in their design, metallurgy, and mechanical properties. However, their shaping ability was similar, without any clinically significant errors. Understanding these characteristics may help clinicians to make decisions regarding which instrument to choose for a particular clinical situation.

Multimethod analysis of three rotary instruments produced by electric discharge machining technology

“…The analysis of centring ability (canal transportation/centroid shift) was not performed in the present study because the selection criteria included only root canals with moderate curvature and tested instruments had a very high flexibility, demonstrated by their transformation temperature curves (Figure 3) and bending load results (Table 1). In these conditions, it is unlikely that clinical relevant changes in the original canal curvature could be noticed, as previously reported (Gagliardi et al, 2015;Silva et al, 2023;Silva, Lima, et al, 2022;Silva, Martins, et al, 2022). Therefore, future studies are suggested to compare the ability of instruments produced by EDM technology to prepare severely curved canals.…”

Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments

“…In clinical practice, many other factors, such as operator experience and anatomical complexities, act simultaneously, affecting the mechanical behavior of files used [ 30 , 31 ]. In addition, differences in the mechanical behavior of tested instruments should be determined, considering multiple factors including the phase transformation temperatures of heat-treated alloys [ 32 ]. CM alloys have been extensively investigated [ 28 ], whereas no data are available on T-wire phase transformation temperature.…”

Micro-Computed Tomographic Evaluation of the Shaping Ability of Vortex Blue and TruNatomyTM Ni-Ti Rotary Systems

“…In the literature, TruNatomy les showed 50-52% of untouched canal surface area which had insigni cant difference when compared to Vortex Blue les [5], but signi cantly higher percentage compared to EdgeFile X3, XP-Shaper, WaveOne Gold, Reciproc Blue, TRUShape and iRace [8, 19,20]. On the other hand, Vortex Blue les resulted in 55-58% of untouched canal surface area with a signi cant higher percentage when compared to XP-Shaper and TRUShape [21][22][23].…”

“…Micro-CT imaging technology has been recognized as the most accurate research tool for the study of root canal anatomy and the morphological changes in the root canal system after chemo-mechanical instrumentation [6-8]. To our knowledge, only one study in the literature has conducted a comprehensive assessment of Vortex Blue with TruNatomy les [5].…”