TY - JOUR
T1 - Comparison of autoclaving effects on torsional deformation and fracture resistance of three innovative endodontic file systems
AU - Casper, Rhett B.
AU - Roberts, Howard W.
AU - Roberts, Mark D.
AU - Himel, Van T.
AU - Bergeron, Brian E.
PY - 2011/11
Y1 - 2011/11
N2 - Introduction: Recent innovative manufacturing techniques have produced nickel-titanium (NiTi) rotary instruments with reports of superior properties compared with standard NiTi files. These include Profile Vortex made from M-Wire (PV), Twisted Files (TF), and 10 Series files made from CM Wire (CM). Sterilization is recommended before use and is repeated if files are reused and/or carried forward between cases. The purpose for this study was to compare the effects of multiple autoclaving cycles on the torsional load resistance of these 3 new rotary endodontic files. Methods: PV, TF, and CM files (n = 100; size 25/.04) were divided into 5 groups (n = 20). Files were steam autoclaved for 1, 2, 3, and 7 sterilization cycles. A control group was not subjected to autoclaving. Files were tested in a torsiometer in general accordance with ISO 3630-1 standards. Torsional load and degrees of rotation to failure were recorded. Mean data were analyzed by using Kruskal-Wallace/Dunn post hoc tests (P <.05). Results: Autoclave cycles had no significant overall effect on file performance for any of the instrument systems tested. PV and CM displayed significantly greater resistance to torsional load than TF (P <.001) but were not different from each other (P >.05). Angular deflection values for TF and CM were significantly higher than for PV (P <.001), with TF demonstrating greater rotational distortion than CM (P <.05). Conclusions: Under the conditions of this study, repeated steam autoclaving did not affect torsional resistance for unused files of the systems evaluated. In addition, CM Wire files might have a combined advantage of greater torsional strength and high deformation before failure.
AB - Introduction: Recent innovative manufacturing techniques have produced nickel-titanium (NiTi) rotary instruments with reports of superior properties compared with standard NiTi files. These include Profile Vortex made from M-Wire (PV), Twisted Files (TF), and 10 Series files made from CM Wire (CM). Sterilization is recommended before use and is repeated if files are reused and/or carried forward between cases. The purpose for this study was to compare the effects of multiple autoclaving cycles on the torsional load resistance of these 3 new rotary endodontic files. Methods: PV, TF, and CM files (n = 100; size 25/.04) were divided into 5 groups (n = 20). Files were steam autoclaved for 1, 2, 3, and 7 sterilization cycles. A control group was not subjected to autoclaving. Files were tested in a torsiometer in general accordance with ISO 3630-1 standards. Torsional load and degrees of rotation to failure were recorded. Mean data were analyzed by using Kruskal-Wallace/Dunn post hoc tests (P <.05). Results: Autoclave cycles had no significant overall effect on file performance for any of the instrument systems tested. PV and CM displayed significantly greater resistance to torsional load than TF (P <.001) but were not different from each other (P >.05). Angular deflection values for TF and CM were significantly higher than for PV (P <.001), with TF demonstrating greater rotational distortion than CM (P <.05). Conclusions: Under the conditions of this study, repeated steam autoclaving did not affect torsional resistance for unused files of the systems evaluated. In addition, CM Wire files might have a combined advantage of greater torsional strength and high deformation before failure.
KW - Controlled memory-wire
KW - Twisted File
KW - memory wire
KW - nickle-titanium
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U2 - 10.1016/j.joen.2011.07.008
DO - 10.1016/j.joen.2011.07.008
M3 - Article
C2 - 22000466
AN - SCOPUS:80054058231
SN - 0099-2399
VL - 37
SP - 1572
EP - 1575
JO - Journal of Endodontics
JF - Journal of Endodontics
IS - 11
ER -