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Vol.44, No.6, 392 ~ 400, 2006
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| Title |
| Special Edition : Symposium on Nano and Biomaterials ; Fatigue Fracture Phenomena of Clinically Used Dental Ni-Ti Alloy Files |
| 최한철 Han Cheol Choe , 배성철 Seong Chul Bae , 고영무 Yeong Mu Ko , 황호길 Ho Keel Hwang |
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| Abstract |
| The purpose of this study was to investigate the fatigue fracture phenomena of clinically used dental Ni-Ti alloy files. ProTaper(R)(Maillfer, Dentsply, Ballaigues, Switzerland) were used, respectively, for experiment. In order to observe the fatigue surface of clinically used file, the fractured files were classified into three groups: fractured files at the upper, middle and lower part after clinical use. The fractured surface and chemical composition were studied with energy dispersive X-ray spectroscopy(EDS) and field emission scanning electron microscope(FE-SEM) to analyze elements on the surface of fractured file. Fatigue fracture crack of Ni-Ti file was initiated and propagated at defects such as scratch formed by machine under repeated load. Fractured surface of Ni-Ti file showed the brittle fracture behavior at the exterior and ductile fracture behavior at the interior of specimen. The ductile fracture behavior appeared predominantly at the lower part of Ki-Ti file compared with at the upper part of Ni-Ti file. |
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| Key Words |
| Fatigue Fracture, Dental Ni-Ti Alloy Files, Brittle Fracture, Ductile Fracture |
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