Failure of prosthetic screws on 971 implants
نویسندگان
چکیده
منابع مشابه
A rationale method for evaluating unscrewing torque values of prosthetic screws in dental implants
OBJECTIVES Previous studies that evaluated the torque needed for removing dental implant screws have not considered the manner of transfer of the occlusal loads in clinical settings. Instead, the torque used for removal was applied directly to the screw, and most of them omitted the possibility that the hexagon could limit the action of the occlusal load in the loosening of the screws. The pres...
متن کاملThe control of new prosthetic implants.
The recent well-publicised problem of early failure of the 3M Capital Hip has led both the public and orthopaedic surgeons to question the effectiveness of existing controls in the UK which govern the introduction of new pros-theses for joint replacement. It has also resulted in renewed demands for a National Hip Register, similar to those successfully developed by Sweden and Norway, 1,2 to pro...
متن کاملComparison of "look-alike" implant prosthetic retaining screws.
PURPOSE The maximum preload torque of implant prosthetic retaining screws from four manufacturers and of two alloy types was measured to determine one index of interchangeability of intersystem components. MATERIALS AND METHODS Implant prosthetic retaining screws from four manufacturers (3i Implant Innovations Inc, West Palm Beach, FL; Impla-Med Inc, Sunrise, FL; Nobelpharma USA Inc, Chicago,...
متن کاملFatigue failure of cortical bone screws.
An experimental study of the fatigue life of cortical bone screws under conditions which stimulated in vivo usage was performed. The two most important factors influencing fatigue life were axial screw tension (the force normal of the plate to bone) and the cyclic shearing load. All screws failed at the root of the thread in the interface between the plate and the bone. A modified screw design ...
متن کاملElevated chromium levels and prosthetic joint implants.
Chromium is a naturally occurring, toxic heavy metal used in many industrial processes. The U.S. Department of Labor's Occupational Safety and Health Administration has established specific limits for occupational exposure levels of chromium and guidelines for medical surveillance of individuals who have been exposed to chromium. The author presents a case in which a 54-year-old man who had bee...
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ژورنال
عنوان ژورنال: Brazilian Journal of Oral Sciences
سال: 2015
ISSN: 1677-3225
DOI: 10.1590/1677-3225v14n3a04