TY - JOUR
T1 - Design, metallurgical features, mechanical performance and canal preparation of six reciprocating instruments, metallurgical features
AU - Martins, Jorge N. R.
AU - Silva, Emmanuel J. N. L.
AU - Marques, Duarte
AU - Belladonna, F.
AU - Simões-Carvalho, M.
AU - Vieira, Victor Talarico Leal
AU - Antunes, Henrique Dos Santos
AU - Braz Fernandes, Francisco M. B.
AU - Versiani, Marco Aurélio
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/68317 - DCRRNI ID/UID%2FCTM%2F50025%2F2013/PT#
The authors acknowledge E. Camacho for running the DSC tests. The authors also express their gratitude to VDW for supplying the Reciproc and Reciproc Blue instruments for this study.
Funding Information:
FMBF acknowledges the funding of CENIMAT/i3N by national funds through the FCT-Funda??o para a Ci?ncia e a Tecnologia, I.P., within the scope of Multiannual Financing of R&D Units, reference UIDB/50025/2020-2023. The authors acknowledge E. Camacho for running the DSC tests. The authors also express their gratitude to VDW for supplying the Reciproc and Reciproc Blue instruments for this study.
Publisher Copyright:
© 2021 International Endodontic Journal. Published by John Wiley & Sons Ltd
PY - 2021/9
Y1 - 2021/9
N2 - 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).
AB - 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).
KW - bending load
KW - cyclic fatigue
KW - differential scanning calorimetry
KW - micro-CT
KW - reciprocation
KW - torsional strength
UR - http://www.scopus.com/inward/record.url?scp=85105106064&partnerID=8YFLogxK
U2 - 10.1111/iej.13529
DO - 10.1111/iej.13529
M3 - Article
C2 - 33829516
AN - SCOPUS:85105106064
SN - 0143-2885
VL - 54
SP - 1623
EP - 1637
JO - International Endodontic Journal
JF - International Endodontic Journal
IS - 9
ER -