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Vol.44, No.6, 400 ~ 412, 2006
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| Title |
| Special Edition : Symposium on Nano and Biomaterials ; Surface Analysis of Clinically Failed Dental Implant Fixture |
| 최한철 Han Cheol Choe , 홍국선 Kook Sun Hong , 고영무 Yeong Mu Ko , 김병옥 Byung Ock Kim |
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| Abstract |
| The aim of this investigation was to analyze surface of clinically failed dental implant fixture in order to determine possible causes of failure. The failed implants were classified into three groups; 3 and 5 month used implant, 19 and 60 month used implant, and fractured implant, after implantation for 33 month and 120 month in patient jaws. The topography and surface 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 flank and bottom of thread. Evaluations were performed at the upper, middle and lower implant fixture. From surface observation of 3 and 5 month used implant, contaminants were detected in the middle and lower part of implants. Overall, foreign elements such as silicon, carbon, oxygen, zinc, sulfur, zirconium, and chloride were detected in failed implants. From surface observation of 19 and 60 month used implant, the corrosion was accelerated at the bottom of thread that was accumulated chloride. Corrosion products showed in the bottom of thread including dissolution elements, such as Au, Cu, Ag, from suprastructure of dental implant system. From surface observation of fatigue fractured implants, the crack were nucleated in the bottom of thread and the crack of corrosion fatigue was predominantly propagated. The corrosion products including chloride were found opposite side of starting point of corrosion fatigue crack. We could find the fatigue striation and estimate the dimple fracture of implants. |
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| Key Words |
| Failed Dental Implant Fixture, Suprastructure, Fatigue Fractured Implant |
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