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Fractographic 분석을 통한 HEROShaper 니켈티타늄 전동 파일의 피로파절에 미치는 표면결함의 역할
DC Field | Value | Language |
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dc.contributor.author | 금기연 | - |
dc.contributor.author | 김의성 | - |
dc.date.accessioned | 2014-12-21T16:47:34Z | - |
dc.date.available | 2014-12-21T16:47:34Z | - |
dc.date.issued | 2007 | - |
dc.identifier.issn | 1225-0864 | - |
dc.identifier.uri | https://ir.ymlib.yonsei.ac.kr/handle/22282913/96360 | - |
dc.description.abstract | This in vitro study examined the effect of surface defects on cutting blades on the extent of the cyclic fatigue fracture of HEROShaper Ni-Ti rotary files using fractographic analysis of the fractured surfaces. A total of 45 HEROShaper (MicroMega) Ni-Ti rotary flies with a #30/.04 taper were divided into three groups of 15 each. Group 1 contained new HEROShapers without any surface defects. Group 2 contained HEROShapers with manufacturing defects such as metal rollover and machining marks. Croup 3 contained HEROShapers that had been clinically used for the canal preparation of 4-6 molars A fatigue-testing device was designed to allow cyclic tension and compressive stress on the tip of the instrument whilst maintaining similar conditions to those experienced in a clinic. The level of fatigue fracture time was measured using a computer connected the system. Statistical analysis was performed using a Tukey's test. Scanning electron microscopy (SEM) was used for fractographic analysis of the fractured surfaces. The fatigue fracture time between groups 1 and 2, and between groups 1 and 3 was significantly different (p<0.05) but there was no significant difference between groups 2 and 3 (p>0.05). A low magnification SEM views show brittle fracture as the main initial failure mode At higher magnification, the brittle fracture region showed clusters of fatigue striations and a large number of secondary cracks. These fractures typically led to a central region of catastrophic ductile failure. Qualitatively, the ductile fracture region was characterized by the formation of microvoids and dimpling. The fractured surfaces of the HEROShapers in groups 2 and 3 were always associated with pre-existing surface defects. | - |
dc.description.statementOfResponsibility | open | - |
dc.format.extent | 130~137 | - |
dc.relation.isPartOf | Journal of Korean Academy of Operative Dentistry (대한치과보존학회지) | - |
dc.rights | CC BY-NC-ND 2.0 KR | - |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/2.0/kr/ | - |
dc.title | Fractographic 분석을 통한 HEROShaper 니켈티타늄 전동 파일의 피로파절에 미치는 표면결함의 역할 | - |
dc.title.alternative | The Effect of Surface Defects on the Cyclic Fatigue Fracture of HEROShaper Ni-Ti rotary files in a Dynamic Model : A Fractographic Analysis | - |
dc.type | Article | - |
dc.contributor.college | College of Dentistry (치과대학) | - |
dc.contributor.department | Dept. of Conservative Dentistry (보존과학) | - |
dc.contributor.googleauthor | Jung-Kyu Lee | - |
dc.contributor.googleauthor | Eui-Sung Kim | - |
dc.contributor.googleauthor | Kee-Yeon Kum | - |
dc.contributor.googleauthor | Myoung-Whai Kang | - |
dc.identifier.doi | 10.5395/JKACD.2007.32.2.130 | - |
dc.admin.author | false | - |
dc.admin.mapping | false | - |
dc.contributor.localId | A00271 | - |
dc.contributor.localId | A00833 | - |
dc.relation.journalcode | J01488 | - |
dc.contributor.alternativeName | Kum, Kee Yeon | - |
dc.contributor.alternativeName | Kim, Eui Seong | - |
dc.contributor.affiliatedAuthor | Kum, Kee Yeon | - |
dc.contributor.affiliatedAuthor | Kim, Eui Seong | - |
dc.rights.accessRights | free | - |
dc.citation.volume | 32 | - |
dc.citation.number | 2 | - |
dc.citation.startPage | 130 | - |
dc.citation.endPage | 137 | - |
dc.identifier.bibliographicCitation | Journal of Korean Academy of Operative Dentistry (대한치과보존학회지), Vol.32(2) : 130-137, 2007 | - |
dc.identifier.rimsid | 37477 | - |
dc.type.rims | ART | - |
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