Document Detail

Effect of clinical use on the cyclic fatigue resistance of ProTaper nickel-titanium rotary instruments.
MedLine Citation:
PMID:  17509417     Owner:  NLM     Status:  MEDLINE    
The resistance of ProTaper (Dentsply Maillefer, Ballaigues, Switzerland) nickel-titanium rotary instruments to cyclic fatigue was examined after their initial use in straight or curved canals in vivo. These instruments were rotated freely inside a steel phantom until separation. The number of rotations before failure and the lengths of the separated fragments were compared with data derived from new instruments under the same experimental setup (n = 20). With the exception of F1 and F3, instruments previously used in curved canals were more susceptible to cyclic fatigue than those previously used in straight canals (p < 0.05). Separation occurred predominantly at the D10 to D12 level. For the F series, a negative correlation (p < 0.05) was observed between the number of rotations before failure and the file diameters at their separation levels. ProTaper F3 instruments are highly susceptible to cyclic fatigue failure and should be reused with caution irrespective of whether they are initially used for shaping straight or curved canals.
Hani F Ounsi; Ziad Salameh; Thakib Al-Shalan; Marco Ferrari; Simone Grandini; David H Pashley; Franklin R Tay
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2007-04-16
Journal Detail:
Title:  Journal of endodontics     Volume:  33     ISSN:  0099-2399     ISO Abbreviation:  J Endod     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-05-18     Completed Date:  2007-07-09     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  7511484     Medline TA:  J Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  737-41     Citation Subset:  D    
Department of Endodontics, Saint-Joseph University, Beirut, Lebanon.
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MeSH Terms
Dental Alloys
Dental Instruments*
Dental Pulp Cavity / anatomy & histology
Dental Stress Analysis
Equipment Design
Equipment Failure
Equipment Reuse
Linear Models
Root Canal Preparation / instrumentation*
Grant Support
Reg. No./Substance:
0/Dental Alloys; 12035-60-8/titanium nickelide; 7440-02-0/Nickel; 7440-32-6/Titanium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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