Abstract
Statement of problem
Screw loosening is a common problem in implant dentistry; however, information is
sparse on the influence of different fluids on the screw threads.
Purpose
The purpose of this in vitro study was to investigate the influence of 4 different
fluids and agents (saliva, blood, chlorhexidine [CHX] gel, and special sealing silicone)
on the preload force of abutment screws.
Materials and methods
The test specimens (N=50) consisted of a thread sleeve resembling the implant, an
abutment analog, and an abutment screw. The tightening of the screw with a torque
wrench was performed in 5 steps (15 Ncm, 20 Ncm, 25 Ncm, 30 Ncm, and 35 Ncm). Each
agent was applied in the lumen of the thread sleeve of 10 specimens. Ten dry thread
sleeves served as the control. Comparisons between 2 independent groups were performed
with the t test or Wilcoxon–Mann–Whitney test, as appropriate. The Bonferroni correction was
used for multiple comparisons (α=.05).
Results
Preload forces increased linearly with the applied tightening torque for dry implant
lumina, as well as for saliva, blood, silicone, and CHX gel in the implant lumina
or thread sleeves. In general, none of the tested agents resulted in significantly
higher preload forces compared with the dry control.
Conclusions
The agents investigated did not have any lubricant action on implant abutment screws.
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Article info
Publication history
Published online: September 20, 2020
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
