| Literature DB >> 24279663 |
Gianlucca Gambarini1, Richard Gergi, Nicola Maria Grande, Nada Osta, Gianluca Plotino, Luca Testarelli.
Abstract
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.Entities:
Keywords: clockwise rotation; counterclockwise rotation; cyclic fatigue; heat treatment
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Year: 2012 PMID： 24279663 DOI： 10.1111/j.1747-4477.2012.00353.x
Source DB: PubMed Journal: Aust Endod J ISSN： 1329-1947 Impact factor: 1.659