Abstract
Fractured implants can cause significant problems for both clinicians and patients, although they are fortunately rare. The major cause of fractured implant may be afatigue fracture. To investigate how to increase the fatigue life and corrosion resistance of dental implants, the surface morphology of fractured implants were analyzed after clinical use. The period of surgical implantation after loading in patient jaws varied between a several months and years.Four fractured implant systems collected from Chosun Dental Hospital after clinical use. Three abutment screws and one fixture wereused in this study with FE-SEM(field emission scanning electron microscope)after washing 5minutes to remove debris with ultrasonic cleaner. Three of foursamples were fractured at abutment screw valley formed keen-edged shape. In the cases of abutment screw fractures,twosamples were fractured at the first thread of screwand one sample at the third thread of screw.The other one sample wasfractured at thread of fixture. Fractured fixture was analysedwithcross-sectional fracture surface and longitudinal fracture surface both. From observation of fatigue striations, it is possible to predict the life time of fractured implants and estimate the cleavage fracture and dimple fracture of implants.
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