Mechanical Performance and Metallurgical Features of ProTaper Universal and 6 Replicalike Systems

Jorge N. R. Martins, Emmanuel J. N. L. Silva, Duarte Marques, Mário Rito Pereira, António Ginjeira, Rui J. C. Silva, Francisco Manuel Braz Fernandes, Marco Aurélio Versiani

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Introduction: This study aimed to compare the ProTaper Universal (PTU; Dentsply Maillefer, Ballaigues, Switzerland) system with 6 replicalike instruments regarding instrument design, mechanical performance, and alloy characteristics. Methods: New rotary instruments (size 20/.07v) of PTU and 6 replicalike systems (EdgeTaper [EdgeEndo, Johnson City, TN], U-File [Dentmark, Ludhiana, India], Go-Taper Universal [Access, Shenzhen, China], Super Files [Flydent, Shenzhen, China], Multitaper [Proclinic Expert, Besançon, France], and Pluri Taper [Bestdent, Shenzhen, China]) (n = 329) were selected and evaluated regarding their design, mechanical performance, and metallurgical characteristics. The results were compared using the nonparametric Mood median test and 1-way analysis of variance with the significance level set at 0.05. Results: Replicalike instruments were similar to PTU regarding design, maximum torque to fracture (P >. 05), and ratio of nickel and titanium elements. Scanning electron microscopy revealed differences in the geometry of the tip and finishing surfaces. Time to fracture of Go-Taper Universal (50.0 seconds) was similar to PTU (44.0 seconds) (P >. 05), but the U-File (63.5 seconds), Edge Taper (87.5 seconds), and Super Files (130 seconds) showed significantly higher values (P < .05). The highest maximum torque was observed in the Super Files instrument (P < .05), but no statistical difference was noted among the other instruments (P >. 05). The angle of rotation before rupture of the Multitaper (574°) and Pluri Taper (481°) was higher than PTU (354°) (P < .05). Differential scanning calorimetric analysis showed clear differences on the transformation temperatures among the tested instruments. The R-phase start and finish temperatures of PTU were 11.0°C and −18.0°C, respectively. Conclusions: Overall, replicalike instruments were similar to PTU regarding the torsional resistance, geometric design, and near equiatomic proportions of nickel and titanium elements. In 3 of the 4 mechanical tests, the EdgeTaper (torque, angle of rotation, and bending load) and Go-Taper Universal (time to fracture, torque, and angle of rotation) systems were similar to PTU.

Original languageEnglish
Pages (from-to)1884-1893
Number of pages10
JournalJournal of Endodontics
Volume46
Issue number12
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Bending load
  • cyclic fatigue
  • replicalike instrument
  • rotary system
  • torsion

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