To understand the causes of taste disorders on denture wearers, the following experiments were performed on 50 subjects indiscriminately, who have intact dentition. The subjects' impressions were taken, and then the experimental palatal plate was made. The gustatory responses of primary taste, which were shown by the threshold of sensation and the threshold of judgment, were examined by two sensory tests. Both tests were made with and without the palatal plate.
The first test was performed to find the direct cause of tasting difficulty due to the palatal plate covering the taste buds.
The second test was performed to find the indirect cause. Immediately upon wearing the palatal plate, it was confirmed that it is uncomfortable, the tongue space is infringed, speaking becomes difficult, the rhythm of mastication is disordered and the like. Therefore, it is expected that the stimulus of taste has a tendency to prevent transmission to the taste buds and so taste is hard to understand.
Consequently, as soon as the denture was worn, taste disorders were suspected to occur from not only the direct cause but also the indirect cause.