TY - JOUR
T1 - Mechanical Performance and Metallurgical Features of ProTaper Universal and 6 Replicalike Systems
AU - Martins, Jorge N. R.
AU - Silva, Emmanuel J. N. L.
AU - Marques, Duarte
AU - Pereira, Mário Rito
AU - Ginjeira, António
AU - Silva, Rui J. C.
AU - Braz Fernandes, Francisco Manuel
AU - Versiani, Marco Aurélio
N1 - Supported by CENIMAT/i3N by national funds through Portuguese Foundation for Science and Technology (reference UID/CTM/50025/2019) and FCT/MCTES (Fundacao para a Ciencia e a Tecnologia - Ministerio da Ciencia, Tecnologia e Ensino Superior) (F.M.B.F. and R.J.C.S.).
PY - 2020/12
Y1 - 2020/12
N2 - 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.
AB - 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.
KW - Bending load
KW - cyclic fatigue
KW - replicalike instrument
KW - rotary system
KW - torsion
UR - http://www.scopus.com/inward/record.url?scp=85092014186&partnerID=8YFLogxK
U2 - 10.1016/j.joen.2020.08.021
DO - 10.1016/j.joen.2020.08.021
M3 - Article
C2 - 32898557
AN - SCOPUS:85092014186
SN - 0099-2399
VL - 46
SP - 1884
EP - 1893
JO - Journal of Endodontics
JF - Journal of Endodontics
IS - 12
ER -