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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN:
Vol. 14, No. 3, 2015, pp. 195-198
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Bioline Code: os15034
Full paper language: English
Document type: Research Article
Document available free of charge
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Brazilian Journal of Oral Sciences, Vol. 14, No. 3, 2015, pp. 195-198
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Failure of prosthetic screws on 971 implants
Morsch, Carolina Schäffer; Rafael, Caroline Freitas; Dumes, Juan Felipe Montero; Juanito, Gabriella Mercedez Peñarrieta; de Souza, João Gustavo Oliveira & Bianchini, Marco Aurélio
Abstract
Aim: To evaluate the presence of failures in prosthetic screws and whether these failures are
related to the type of prosthesis, abutment angulation and presence or not of intermediate.
Methods: Two-hundred and sixty-seven patients were evaluated at the Federal University of
Santa Catarina, totaling 971 external hexagonal implants in place for at least one year. A Tobit
regression model for censored variables was used and the explanatory variables were subjected
to percentage analysis. Results: The results demonstrated a relationship between the failure in
prosthetic screws and the investigated factors with a significance of F=0.003 and p<0.05. The
percentage analysis showed that the prosthetic screw failed in 8.82% of 238 unitary prostheses
and 10.1% of 773 multiple prostheses. Among 912 abutments, 9.43% failed and in the 59 angled
abutments, failures appeared in 15.25%. A total of 200 prostheses were placed over the implant
platform and 13% failed. A total of 771 prostheses were made over abutment and 8.95% of these
screws failed. Conclusions: Through multiple linear regression it could be concluded that the
type of prosthesis showed no significant influence on the prosthetic screw failure, but other
variables were related to this mechanical failure. There was a significant relationship among the
variables, demonstrating the need for greater attention in choosing the type of prosthesis, the
abutment angulation and whether the prosthesis will be placed directly on the implant platform or
on the abutment.
Keywords
dental implant-abutment design; complications; prosthesis failure; dental prosthesis; implant-supported
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© Copyright 2015 - Brazilian Journal of Oral Sciences Alternative site location: http://www.fop.unicamp.br/brjorals
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