Effects of dental base shape on food bolus transport

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During denture fabrication, the shape of the palatal plate is similar to that of the patient's palate, and its thickness is uniform in most cases. However, clinically, patients wearing new dentures often complain of discomfort during swallowing. We evaluated how the shape of the palatal plate affected food transport in healthy subjects using various foods, and attempted to clarify the best shape to facilitate swallowing. A plaster model of the maxilla of each subject was fabricated using hard stone, New Plastone LE^[○!R] (GC, Tokyo, Japan). Duran^[○!R] 3.0mm (Scheu-Dental, Iserlohn, Germany) was softened using a compression molding machine for dental use, and formed to the palate of the working model. This was used as a base plate. In addition four experimental palatal plates were fabricated based on the following criteria by adding self-curing resin. Plate 1 had a uniform thickness of 1.5mm. In Plate 2, the thickness of the palate was increased to 1/3 the distance from palate to the occlusal surface. In Plate 3, the thickness of the anterior region of the palate from the incisive papilla to the first premolars was gradually increased to 5mm. In Plate 4, the thickness of the left and right lateral palatal regions of the plate were increased by 5mm. Fifteen tapioca pearls (Youki Food, Tokyo, Japan) were used as the test food. The subjects assumed a routine sitting position for eating with a natural posture for swallowing. The examiner placed the test food on the anterior dorsal region of the tongue using a spoon, and the subjects were instructed to swallow it as they would normally. The examiner then confirmed the amount of food remaining and recorded this information. The subjects were classified into two groups based on the amount of food that remained in their mouth. We found that swallowing tended to be easier with Plates 2 or 4 and more difficult with Plate 3. These results suggest that the posterior palatal area of the plate has only a slight influence on food bolus transport.

Effects of dental base shape on food bolus transport

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