| Title |
Special Edition : Symposium on Nano and Biomaterials ; Fatigue Fracture Phenomena of Clinically Used Dental Ni-Ti Alloy Files |
| Authors |
최한철(Han Cheol Choe); 배성철(Seong Chul Bae); 고영무(Yeong Mu Ko); 황호길(Ho Keel Hwang) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Fatigue Fracture; Dental Ni-Ti Alloy Files; Brittle Fracture; Ductile Fracture |
| 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. |