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전동식니켈 티타늄 파일의 표면결함 및 단면 형태가 반복응력 하에서 피로 파절에 미치는 영향

Other Titles
 Effect of surface defects and cross-sectional configuration on the fatigue fracture of NiTi rotary files under cyclic loading 
 신유미  ;  김의성  ;  김광민  ;  금기연  ;  김광만 
 Journal of Korean Academy of Operative Dentistry (대한치과보존학회지), Vol.29(3) : 267-272, 2004 
Journal Title
Journal of Korean Academy of Operative Dentistry(대한치과보존학회지)
Issue Date
Surface defect ; Cross-sectional configuration ; Cyclic fatigue ; Brittle fracture ; Ductile fracture ; NiTi rotary files
The purpose of this in vitro study was to evaluate the effect of surface defects and cross-sectional configuration of NiTi rotary files on the fatigue life under cyclic loading. Three NiTi rotary files (K3^(TM), ProFile^(®), and HERO 642^(®)) with #30/.04 taper were evaluated. Each rotary file was divided into 2 subgroups: control (no surface defects) and experimental group (artificial surface defects). A total of six groups of each 10 were tested. The NiTi rotary files were rotated at 300rpm using the apparatus which simulated curved canal (40 degree of curvature) until they fracture. The number of cycles to fracture was calculated and the fractured surfaces were observed with a scanning electron microscope. The data were analyzed statistically. The results showed that experimental groups with surface defects had lower number of cycles to fracture than control group but there was only a statistical significance between control and experimental group in the K3^(TM) (p<0.05). There was no strong correlation between the cross-sectional configuration area and fracture resistance under experimental conditions. Several of fractured files demonstrated characteristic pat-terns of brittle fracture consistent with the propagation of pre-existing cracks.
This data indicate that surface defects of NiTi rotary files may significantly decrease fatigue life and it may be one possible factor for early fracture of NiTi rotary files in clinical practice.
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Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
Yonsei Authors
Kum, Kee Yeon(금기연)
Kim, Kwang Mahn(김광만) ORCID logo https://orcid.org/0000-0002-5235-0294
Kim, Eui Seong(김의성) ORCID logo https://orcid.org/0000-0003-2126-4761
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