The tongue pressure waveform differed between the control and patient groups. The incidence of a double-peak tongue pressure waveform was more frequent in the patient group. In both groups, the exertion of tongue pressure began at the anterior point of the sensor sheet, followed by the peripheral parts. Although the order of expression of tongue pressure was the same for the two groups, maximum tongue pressure at all parts of the sensor sheet was lower in the patient group than in the control group. Furthermore, swallowing time was longer in the patient group than in the control group at the peripheral parts of the palate. These results clearly show the difference in tongue pressure production during swallowing between patients with mandibular prognathism and volunteers with normal occlusion. The current findings suggest that maxillofacial morphology may affect tongue movement during swallowing.

Background Tongue thrusting, which often occurs during swallowing in patients with anterior open bite, is considered to show different tongue dynamics from healthy individuals, but the details are still unclear. Objective This study aimed to identify the effect of tongue thrusting on tongue pressure production during swallowing in patients with anterior open bite. Methods The subjects were 11 patients with an anterior open bite and 8 healthy volunteers with individual normal occlusion. The patients were divided into a tongue‐thrusting group (n = 8) and a non‐thrusting group (n = 3). Tongue pressures while swallowing jelly (4 mL) were recorded by a sensor sheet system with five measuring points (Chs1‐5) attached to the palatal mucosa. The time sequences, maximum magnitude and duration of tongue pressure, and swallowing time of tongue pressure were analysed. Results Tongue pressure waveforms in the tongue‐thrusting group were quite diverse compared with the other two groups. The duration at the posterior‐median part in the tongue‐thrusting group was significantly shorter, and the maximum magnitudes at the mid‐median, posterior‐median and the peripheral part were also significantly lower than in the healthy group. These results suggest that the compensatory tongue thrust action by which the tongue closes the front part of the oral cavity may make it difficult to lift the tongue and transfer the bolus. Conclusion Patients with an anterior open bite and tongue thrusting at swallowing showed diversity of tongue pressure waveforms and noticeably weaker tongue pressures from mid‐median to posterior‐median regions than healthy individuals.

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Purpose : There is little information available regarding swallowing tongue dynamics in cases that show remarkable discordance in the relationship between the upper and lower jaws. In this study, we measured the tongue motion during swallowing by ultrasonography in patients with mandibular prognathism and compared them with volunteers with normal occlusion. Methods : The subject group comprised 10 patients with mandibular prognathism (6 males, 4 females). Ten volunteers with normal occlusion (2 males, 8 females)

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