Affiliation:
1. Klinika za stomatologiju, Medicinski fakultet, Niš
2. Dom zdravlja, Niš
Abstract
Introduction. Saliva viscosity plays a significant role in the biophysical
segment of the total retention potential of total dentures. Objective. The
aim of the paper was to establish the dependence of dynamic retention force
of experimental plates on experimental fluid viscosity and especially time
dependence of these parameters, following at the same time relative changes
of the distance between the experimental plate and dentures support
established by the dislocation of the experimental plate in both directions.
Methods. For experimental verification we used an original device with the
aim to enable in vivo simulation on the phantom made of the upper total
denture prosthesis support and experimental plate. The experiment consisted
of two parts. In the first part we determined the value of the dynamic
retention force with plates without and with achieved ventilation effect. In
the second part we determined time dependence of the dynamic retention force
of experimental plates on the viscosity of experimental fluids that had been
priorly determined on identical samples (8 ml of experimental fluid samples)
using a rotational viscometer (Haake RV-12) with a sensor (MV, Germany).
Results Under the conditions of variable viscosity rates of seven
experimental fluids (from 0.02 to 1309.04 mPa?s), we registered the time
dependence of dynamic retention force of the experimental plate related to
fluid viscosity during the action of the continual dislocating force of the
separating directions. In addition, the maximal height of the dislocation of
the experimental plate was registered. The dynamic retention force,
manifested by the separating direction of the experimental plate dislocation,
was increased concurrently with increased viscosity. Conclusion. The increase
of dynamic retention force depends directly on medium viscosity. Close border
values of fluid viscosity above the investigated ones, the impossibility of
experimental layer thinning and the decrease of distance height probably
influence the onset of separating dislocation.
Publisher
National Library of Serbia