An in vitro assessment of the physical properties of novel Hyflex nickel-titanium rotary instruments

International Endodontic Journal
O A PetersJ T Han

Abstract

To determine several properties including torsional and fatigue limits, as well as torque during canal preparation, of Hyflex, a rotary instrument manufactured from so-called controlled memory nickel-titanium alloy. The instruments were tested in vitro using a special torque bench that permits both stationary torque tests according to ISO3630-1 and fatigue limit determination, as well as measurement of torque (in Ncm) and apical force (in N) during canal preparation. Fatigue limit (in numbers of cycles to failure) was determined in a 90°, 5 mm radius block-and-rod assembly. Simulated canals in plastic blocks were prepared using both a manufacturer-recommended single-length technique as well as a generic crown-down approach. anova with Bonferroni post hoc procedures was used for statistical analysis. Torque at failure ranged from 0.47 to 1.38 Ncm, with significant differences between instrument sizes (P < 0.0001). Fatigue life ranged from 260 to 2565, with the shortest and longest lifespan for instruments size 20, .04 taper and size 25, .08 taper, respectively. Torque during canal preparation was significantly higher for small instruments used in the single-length technique but lower for the size 40, .04 taper, compared to a cro...Continue Reading

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Citations

Aug 26, 2014·Journal of Endodontics·Lígia Carolina Moreira BragaMaria Guiomar de Azevedo Bahia
Feb 19, 2015·Journal of Functional Biomaterials·Claudio PoggioStefano Bianchi
Mar 29, 2014·Journal of Endodontics·Les CampbellMarkus Haapasalo
Nov 19, 2013·Journal of Endodontics·Renata Dornelles MorgentalOve A Peters
Apr 21, 2016·European Journal of Dentistry·Thilla Sekar VinothkumarArunachalam Rajadurai
Nov 18, 2014·International Endodontic Journal·M F V Marceliano-AlvesM A Versiani
Apr 7, 2015·Journal of Endodontics·Ya ShenMarkus Haapasalo
Jan 22, 2013·International Endodontic Journal·Y ShenM Haapasalo
Sep 4, 2013·International Endodontic Journal·O A PetersF V Vier-Pelisser
Jan 8, 2014·International Endodontic Journal·A M Elnaghy
Sep 19, 2015·International Endodontic Journal·M M KoçakF Furuncuoğlu
Jul 31, 2014·International Endodontic Journal·M Alfoqom AlazemiP M H Dummer
Mar 2, 2016·European Journal of Dentistry·Thilla Sekar VinothkumarArunachalam Rajadurai
May 25, 2016·Journal of Conservative Dentistry : JCD·Anil KishenMadhu K Nair
Oct 17, 2017·Clinical Oral Investigations·Amr Elnaghy, Shaymaa Elsaka
Dec 11, 2017·Clinical Oral Investigations·Murilo Priori AlcaldeRodrigo Ricci Vivan
Mar 27, 2018·International Endodontic Journal·J ZupancE Schäfer
Feb 6, 2020·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Amr M ElnaghyAlaa H Elshazli
Oct 27, 2018·Brazilian Oral Research·Giulio GaviniGeorge Táccio de Miranda Candeiro
Aug 23, 2018·Journal of Applied Oral Science : Revista FOB·Túlio César ModestoAna Cecília Diniz Viana
Nov 29, 2020·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Isabelle Luise Lima GomesLucio Souza Gonçalves
Jan 3, 2021·Journal of Endodontics·Mostafa M A Elkholy, William Nguyen Ha
Nov 8, 2017·The Journal of Contemporary Dental Practice·Hani F OunsiSukumaran Anil

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