Fig. 4

The sample was applied to the inner surface of the floor of the palatal plate. Afterwards, the palatal plate was placed in the mouth for 10 s at 25-N pressure. The pressure sensor was then retracted, and the retention force was measured. After measuring the holding force, the plate was again pressed into the mouth. Measurements were taken every 10 min for 30 min, starting when the floor of the palate was placed. Measurements were repeated four times at each time point. After the measurements were completed, the study participants were asked to wash the palatal plate with water and complete a questionnaire on their evaluation of the samples used.