Abstract
Statement of problem
A nitinol sleeve that uses shape memory to rapidly unlock dental restorations from
implant abutments has been developed to allow prosthesis removal for assessment and
maintenance, and clinical treatment has been promising. However, objective studies
that evaluate the wear and retention performance after short-term clinical use are
lacking.
Purpose
The purpose of this clinical study was to evaluate the wear and retention performance
of a shape-memory abutment system after 6 months of clinical use.
Material and methods
Shape-memory alloy sleeves on posterior osseointegrated implants were retrieved after
6 months of clinical use. Scanning electron microscopy (SEM) was used to evaluate
the surfaces of the retention sleeve’s arms for wear. Uniaxial tensile testing was
performed to measure the change in retention force after clinical use. Average retention
values of the shape-memory abutment system were compared with previously reported
in vitro retention values for definitive and interim cements used in titanium abutment
and coping assemblies by using the Welch t test.
Results
No evidence of wear, fracture, or chipping was observed during SEM analysis on the
shape-memory alloy sleeves. Additionally, no statistically significant difference
was found in the median retention force for new (484.5 N) and clinically retrieved
(476 N) nitinol sleeve specimens. Compared with a commercially available resin cement,
the mean retention force for the control sleeves (480 ±37 N) was higher than that
for the freshly cemented specimens (336.3 ±188 N). After 5000 cycles of compressive
loads, the mean retention force for cement specimens decreased (209.4 ±83 N), while
the clinical sleeves (476 ±50 N) remained unchanged.
Conclusions
According to the results of this study, after 6 months of clinical use, the engaging
surfaces of the shape-memory alloy sleeve did not show signs of wear, and the retention
force was unchanged.
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Article info
Publication history
Published online: November 25, 2019
Identification
Copyright
© 2019 by the Editorial Council for The Journal of Prosthetic Dentistry.
