Statement of problem
Implant-supported prostheses are mechanically connected to implants. When this connection
is a screw joint, it is likely that the fit will be imperfect. Previous studies demonstrate
that deformation can occur at the interface between the prosthesis and implant following
cyclic loading. This deformation alters the fit of components. If implant connection
components, abutments, were to be reoriented or replaced, it is likely that deformed
surfaces would no longer approximate each other. Likewise, it is possible that the
deformation may deleteriously alter the fit to replacement components.
Purpose
This study evaluated the changes in prosthesis–implant abutment fit when gold cylinders
that have been cyclically loaded are mated to as-manufactured abutments.
Material and methods
Fifteen implant-supported frameworks were fabricated using conventional casting techniques
and were cyclically loaded under 3 different loading conditions: anterior region,
unilaterally on posterior cantilever, and bilaterally on posterior cantilever. A cyclical
load of 200 N was applied to each framework for 200,000 cycles. The abutments and
frameworks were returned to the definitive casts for measurements. Linear measurements
(μm) of the gap between the prosthetic cylinder and the implant-supported abutment
at 4 predetermined reference points were made. The cycled abutments were replaced
with as-manufactured abutments, and the gaps were measured at the same reference points.
The Mann-Whitney rank-sum test was applied to the 2 sets of data to determine whether
significant changes in fit were observed following component replacement (α=.05).
Results
Although minor changes in component fit were seen, the data failed to show that gaps
at the prosthetic-abutment interface of cycled abutments were significantly different
from those of as-manufactured abutments.
Conclusions
Within the limitations of this study, differences in the fit between the implant-supported
prosthesis and the abutments were not significantly different when abutments worn
through loading were replaced with new as-manufactured abutments.
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Article info
Publication history
Mayo Clinic, Mayo Graduate School of Medicine, Rochester, Minn; Bundang Jesaeng Hospital, Seoungnam City, South Korea
Footnotes
Presented at the Academy of Prosthodontics Annual Meeting, May 2003, Boston, Mass.
Identification
Copyright
© 2006 The Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
