Fracture of abutment screw supporting a cemented implant-retained prosthesis with external hexagon connection: a case report with sem evaluation
J. appl. oral sci
;
15(2): 148-151, Mar.-Apr. 2007. ilus
Article
in English
| LILACS
| ID: lil-452774
ABSTRACT
One of the causes of implant failures in cemented implant-retained prostheses is the fracture of abutment screw or UCLA abutment. This article reports a case of simultaneous fracture of two UCLA abutments screws occurring in an implant-supported prosthesis placed in the mandibular molar region. The fractured structures were examined under scanning electron microscopy to investigate the probable causes of the failure, which were not related to failures on materials or fabrication of the screws, but rather were due to shear forces. The misfit in cemented prostheses may be the most likely cause of shear force generation.
Full text:
Available
Index:
LILACS (Americas)
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2007
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
University Santo Amaro/BR
/
University of São Paulo/BR
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