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.
Cyclic fatigue resistance of newly manufactured rotary nickel titanium instruments used in different rotational directions / Gambarini, Gianluca; Richard, Gergi; Grande, NICOLA MARIA; Nada, Osta; Gianluca, Plotino; Testarelli, Luca. - In: AUSTRALIAN ENDODONTIC JOURNAL. - ISSN 1329-1947. - 39:(2013), pp. 151-154. [10.1111/j.1747-4477.2012.00353.x]
Cyclic fatigue resistance of newly manufactured rotary nickel titanium instruments used in different rotational directions
GAMBARINI, Gianluca;GRANDE, NICOLA MARIA;TESTARELLI, Luca
2013
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
