| Effect of clinical use on the cyclic fatigue resistance of ProTaper nickel-titanium rotary instruments. | |
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MedLine Citation:
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PMID: 17509417 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Hani F Ounsi; Ziad Salameh; Thakib Al-Shalan; Marco Ferrari; Simone Grandini; David H Pashley; Franklin R Tay |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2007-04-16 |
Journal Detail:
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Title: Journal of endodontics Volume: 33 ISSN: 0099-2399 ISO Abbreviation: J Endod Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-05-18 Completed Date: 2007-07-09 Revised Date: 2007-12-03 |
Medline Journal Info:
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Nlm Unique ID: 7511484 Medline TA: J Endod Country: United States |
Other Details:
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Languages: eng Pagination: 737-41 Citation Subset: D |
Affiliation:
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Department of Endodontics, Saint-Joseph University, Beirut, Lebanon. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Dental Alloys Dental Instruments* Dental Pulp Cavity / anatomy & histology Dental Stress Analysis Equipment Design Equipment Failure Equipment Reuse Humans Linear Models Nickel Root Canal Preparation / instrumentation* Titanium Torque |
| Grant Support | |
ID/Acronym/Agency:
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R01 DE 014911/DE/NIDCR NIH HHS |
| Chemical | |
Reg. No./Substance:
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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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