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Cyclic fatigue resistance of newly manufactured rotary nickel titanium instruments used in different rotational directions
Author(s) -
Gambarini Gianlucca,
Gergi Richard,
Grande Nicola Maria,
Osta Nada,
Plotino Gianluca,
Testarelli Luca
Publication year - 2013
Publication title -
australian endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.703
H-Index - 34
eISSN - 1747-4477
pISSN - 1329-1947
DOI - 10.1111/j.1747-4477.2012.00353.x
Subject(s) - clockwise , materials science , nickel titanium , rotation (mathematics) , cyclic stress , titanium , vortex , wear resistance , rotational speed , metallurgy , composite material , mathematics , mechanical engineering , shape memory alloy , engineering , physics , mechanics , geometry
The aim of this study was to investigate whether cyclic fatigue resistance is increased for nickel titanium instruments manufactured with improved heating processes in clockwise or counterclockwise continuous rotation. The instruments compared were produced either using the R‐phase heat treatment (K3XF; SybronEndo, Orange, CA, USA) or the M‐wire alloy (ProFile Vortex; DENTSPLY Tulsa Dental Specialties, Tulsa, OK, USA). Tests were performed with a specific cyclic fatigue device that evaluated cycles to failure of rotary instruments in curved artificial canals. Results indicated no significant difference in resistance to cyclic fatigue when rotary nickel titanium instruments are used in clockwise or counterclockwise continuous rotation. In both directions of rotation, size 04‐25 K3XF showed a significant increase ( P < 0.05) in the mean number of cycles to failure when compared with size 04‐25 ProFile Vortex.