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- Publisher Website: 10.1016/j.dental.2007.09.004
- Scopus: eid_2-s2.0-43049121394
- PMID: 17996288
- WOS: WOS:000255961300006
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Article: Low-cycle fatigue of rotary NiTi endodontic instruments in hypochlorite solution
Title | Low-cycle fatigue of rotary NiTi endodontic instruments in hypochlorite solution |
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Authors | |
Keywords | Breakage Corrosion fatigue Failure Fractographic examination Fracture Nickel-titanium Root canal preparation Strain-life analysis |
Issue Date | 2008 |
Publisher | Elsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental |
Citation | Dental Materials, 2008, v. 24 n. 6, p. 753-759 How to Cite? |
Abstract | Objective: To examine the low-cycle fatigue (LCF) behaviour of NiTi rotary endodontic instruments in aqueous sodium hypochlorite solution. Methods: Four brands of NiTi rotary instrument (n = 179) were subjected to a rotational-bending fatigue test at a rate of 250 rpm until fracture, the instrument being immersed in 1.2% sodium hypochlorite solution. The surface strain amplitude, calculated from the curvature (from a pre-test photograph) and diameter of the fracture cross-section (from SEM photomicrograph) was plotted against the total number of revolutions to failure. An apparent fatigue-ductility exponent was determined from a regression line fitted to the LCF lives for each brand of instrument. All detached fragments were examined fractographically for crack initiation and the extent of crack extension into the cross-section. The values were compared using one-way analysis of variance (ANOVA) or χ2, where appropriate, at α = 0.05. Results: A linear strain-life relationship was obtained for all groups; the apparent fatigue-ductility exponent was similar between various brands (ANOVA, P > 0.05), but not for the number of crack origins (χ2, P < 0.05). There was an inverse, linear relationship between the square root of the extension of the fatigue-crack and the strain amplitude. Significance: NiTi rotary instruments fatigued in hypochlorite shows a strain-life relationship with low-cycle and high-cycle fatigue regions. The LCF behaviour is not affected by the cross-sectional shape of the instrument. There appears to be a critical extent of crack propagation for various surface strain amplitudes leading to final, catastrophic fracture of the instrument. © 2007 Academy of Dental Materials. |
Persistent Identifier | http://hdl.handle.net/10722/65913 |
ISSN | 2023 Impact Factor: 4.6 2023 SCImago Journal Rankings: 1.186 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Cheung, GSP | en_HK |
dc.contributor.author | Darvell, BW | en_HK |
dc.date.accessioned | 2010-09-06T05:42:02Z | - |
dc.date.available | 2010-09-06T05:42:02Z | - |
dc.date.issued | 2008 | en_HK |
dc.identifier.citation | Dental Materials, 2008, v. 24 n. 6, p. 753-759 | en_HK |
dc.identifier.issn | 0109-5641 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/65913 | - |
dc.description.abstract | Objective: To examine the low-cycle fatigue (LCF) behaviour of NiTi rotary endodontic instruments in aqueous sodium hypochlorite solution. Methods: Four brands of NiTi rotary instrument (n = 179) were subjected to a rotational-bending fatigue test at a rate of 250 rpm until fracture, the instrument being immersed in 1.2% sodium hypochlorite solution. The surface strain amplitude, calculated from the curvature (from a pre-test photograph) and diameter of the fracture cross-section (from SEM photomicrograph) was plotted against the total number of revolutions to failure. An apparent fatigue-ductility exponent was determined from a regression line fitted to the LCF lives for each brand of instrument. All detached fragments were examined fractographically for crack initiation and the extent of crack extension into the cross-section. The values were compared using one-way analysis of variance (ANOVA) or χ2, where appropriate, at α = 0.05. Results: A linear strain-life relationship was obtained for all groups; the apparent fatigue-ductility exponent was similar between various brands (ANOVA, P > 0.05), but not for the number of crack origins (χ2, P < 0.05). There was an inverse, linear relationship between the square root of the extension of the fatigue-crack and the strain amplitude. Significance: NiTi rotary instruments fatigued in hypochlorite shows a strain-life relationship with low-cycle and high-cycle fatigue regions. The LCF behaviour is not affected by the cross-sectional shape of the instrument. There appears to be a critical extent of crack propagation for various surface strain amplitudes leading to final, catastrophic fracture of the instrument. © 2007 Academy of Dental Materials. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Elsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental | en_HK |
dc.relation.ispartof | Dental Materials | en_HK |
dc.rights | Dental Materials. Copyright © Elsevier Inc. | en_HK |
dc.subject | Breakage | en_HK |
dc.subject | Corrosion fatigue | en_HK |
dc.subject | Failure | en_HK |
dc.subject | Fractographic examination | en_HK |
dc.subject | Fracture | en_HK |
dc.subject | Nickel-titanium | en_HK |
dc.subject | Root canal preparation | en_HK |
dc.subject | Strain-life analysis | en_HK |
dc.subject.mesh | Corrosion | en_HK |
dc.subject.mesh | Dental Alloys - chemistry | en_HK |
dc.subject.mesh | Disinfectants - chemistry | en_HK |
dc.subject.mesh | Elasticity | en_HK |
dc.subject.mesh | Equipment Design | en_HK |
dc.subject.mesh | Equipment Failure | en_HK |
dc.subject.mesh | Humans | en_HK |
dc.subject.mesh | Materials Testing | en_HK |
dc.subject.mesh | Microscopy, Electron, Scanning | en_HK |
dc.subject.mesh | Nickel - chemistry | en_HK |
dc.subject.mesh | Pliability | en_HK |
dc.subject.mesh | Root Canal Preparation - instrumentation | en_HK |
dc.subject.mesh | Rotation | en_HK |
dc.subject.mesh | Sodium Hypochlorite - chemistry | en_HK |
dc.subject.mesh | Stress, Mechanical | en_HK |
dc.subject.mesh | Surface Properties | en_HK |
dc.subject.mesh | Titanium - chemistry | en_HK |
dc.subject.mesh | Torque | en_HK |
dc.title | Low-cycle fatigue of rotary NiTi endodontic instruments in hypochlorite solution | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0109-5641&volume=24&spage=753&epage=9&date=2008&atitle=Low-cycle+fatigue+of+rotary+NiTi+endodontic+instruments+in+hypochlorite+solution | en_HK |
dc.identifier.email | Cheung, GSP: spcheung@hkucc.hku.hk | en_HK |
dc.identifier.email | Darvell, BW: b.w.darvell@hku.hk | en_HK |
dc.identifier.authority | Cheung, GSP=rp00016 | en_HK |
dc.identifier.authority | Darvell, BW=rp00007 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.dental.2007.09.004 | en_HK |
dc.identifier.pmid | 17996288 | - |
dc.identifier.scopus | eid_2-s2.0-43049121394 | en_HK |
dc.identifier.hkuros | 141556 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-43049121394&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 24 | en_HK |
dc.identifier.issue | 6 | en_HK |
dc.identifier.spage | 753 | en_HK |
dc.identifier.epage | 759 | en_HK |
dc.identifier.eissn | 1879-0097 | - |
dc.identifier.isi | WOS:000255961300006 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Cheung, GSP=7005809531 | en_HK |
dc.identifier.scopusauthorid | Darvell, BW=7005953926 | en_HK |
dc.identifier.issnl | 0109-5641 | - |