Analysis of abnormal tongue movement by three dimensional tongue movement measurement device with bimorph piezopolymer thin film

本研究对象为正常牙合1例，开牙合1例，均获得本研究合作协议。该传感器在舌体的矢状面方向上以三排的方式排列，共排列了五层压电聚合物薄膜。舌背中央区的舌侧曲率明显小于舌背中央区的曲率。其曲率特征也与中央部的曲率相似。由于上述原因，仅测量吞咽时舌中央部分的运动就足够了。结果如下：1.正常咬合情况下，舌背感受器的曲率较大，并允许舌背向上。2.正常咬合情况下，舌背向下的位置在舌尖到达最高位置之前就开始向下，在舌尖达到最高位置后，舌背向下的位置最向下。在开牙合病例中，背部向下的开始时间与正常咬合病例相似。但舌尖活动量较小，舌背下降较正常咬合早期出现，舌背在舌尖位于最上方之前最向下，推测为适应前牙合代偿性舌体运动是为了维持负压吞咽。由于研究对象较少，在下一步的研究中应增加研究对象。

The subjects of this research was composed of normal occlusion 1 case and openbite 1 case which had obtained the agreement of cooperation for this research. The sensor which arranged five bimorph piezopolymer thin films was arranged by three rows in the direction of tongue's sagittal plane. However, the curvature on the lateral side was considerably smaller than the curvature in dorsum of tongue central part. The characteristic of the curvature was also similar to the curvature in central part. It was enough in the measurement only of tongue central part in tongue movement at swallowing in the above-mentioned reason.The results were at follows.1.In normal occlusion case, the curvature of the sensor in the dorsum of tongue was large, and upward in the dorsum of tongue was admitted. However, in openbite case, the curvature in the dorsum of tongue was small and the dorsum of tongue was a smooth tendency while swallowing.2.In normal occlusion case, the downward in the dorsum of tongue had started before the tongue tip reached an uppermost position, and after the tongue tip reached an uppermost position, the dorsum of tongue was located most downward. In openbite case, the beginning time of the dorsum's downward was similar to the normal occlusion case. However, amount of the movement on the tongue tip was small, the descent of the dorsum of tongue appeared at the early stage compared to the normal occlusion case, and dorsum of tongue had been located most downward before the tip of tongue was located in uppermost one.From the above-mentioned result, it was guessed that the compensatory tongue movement which had been adapted to anterior openbite occurred to maintain a negative air pressure for swallowing. Because the subjects were few, subjects should be increased in the next research.