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. 2021 Sep;54(9):1623-1637.
doi: 10.1111/iej.13529. Epub 2021 May 5.

Design, metallurgical features, mechanical performance and canal preparation of six reciprocating instruments

J N R Martins  1   2   3 , E J N L Silva  4   5 , D Marques  2   3   6 , F Belladonna  5 , M Simões-Carvalho  5 , V T L Vieira  4 , H S Antunes  4 , F M B Braz Fernandes  7 , M A Versiani  8
Affiliations

Design, metallurgical features, mechanical performance and canal preparation of six reciprocating instruments

J N R Martins et al. Int Endod J. 2021 Sep.

Abstract

Aim: To compare six reciprocating instruments regarding their geometric design, metallurgical characteristics, mechanical behaviour and ability to prepare root canals.

Methodology: A total of 246 new 25-mm NiTi instruments (41 per group) from six reciprocating systems (Reciproc, Reciproc Blue, One Files, One Files Blue, Reverso Silver, and WaveOne Gold) were evaluated throughout a multimethod approach regarding their design using stereomicroscopy (number of blades and helix angle) and scanning electron microscopy (blades symmetry, cross section and surface finishing), nickel-titanium composition, phase transformation temperatures, mechanical performance (cyclic fatigue, torsional and bending resistance) and unprepared canal surface area on anatomically matched mandibular molars assessed by micro-CT. One-way ANOVA and post hoc Tukey's or Mood's median tests were selected depending on sample distribution with significance level set at 5%.

Results: The instruments had similarities regarding their metal composition and unprepared canal area, whilst differences in phase transformation temperatures and geometric design (number of blades, surface finishing and tip geometry) were observed. Overall, no difference was observed regarding the maximum torque values (P > 0.05), whilst One Files (72 s) and One Files Blue (414 s) had the shortest and longest times to fracture, respectively (P < 0.05). Similar angles of rotation were observed in Reciproc (310°), One Files (285°) and Reverso Silver (318°) instruments (P > 0.05), which were significantly lower than Reciproc Blue (492°), One Files Blue (456°) and WaveOne Gold (492°; P < 0.05). Maximum bending load demonstrated that Reciproc Blue (201.3 gf) was significantly more flexible that the other instruments (P < 0.05).

Conclusion: Although there were similarities in metal composition and percentage of unprepared canal surface, the instruments had differences in the overall geometric design, phase transformation temperatures and in the four mechanical resistance parameters (time to fracture, maximum torque, angle of rotation and maximum bending load).

Keywords: bending load; cyclic fatigue; differential scanning calorimetry; micro-CT; reciprocation; torsional strength.

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References

    1. Alberton CS, Tomazinho FSF, Calefi PS, Duarte MAH, Vivan RR, Baratto-Filho F (2020) Influence of the preparation order in four-canal maxillary molars with WaveOne Gold system. Journal of Endodontics 46, 1291-6.
    1. Al-Obaida MI, Merdad K, Alanazi MS et al. (2019) Comparison of cyclic fatigue resistance of 5 heat-treated nickel-titanium reciprocating systems in canals with single and double curvatures. Journal of Endodontics 45, 1237-41.
    1. Anderson ME, Price JW, Parashos P (2007) Fracture resistance of electropolished rotary nickel-titanium endodontic instruments. Journal of Endodontics 33, 1212-6.
    1. ASTM International (2004) ASTM F2004−17: standard test method for transformation temperature of nickel-titanium alloys by thermal analysis. 5 p.
    1. Best S, Watson P, Pilliar P, Kulkarni G, Yared G (2004) Torsional fatigue and endurance limit of a size 30.06 ProFile rotary instrument. International Endodontic Journal 37, 370-3.

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