Construction of data base for open bite patients by using of wireless telemeter system to measure tongue pressure and headposture for a long period

舌的错位被认为是错牙合的一个可能原因，但在日常活动中没有最佳的系统来测量其位置和长时间的压力。为了在自然条件下长时间测量开放咬伤患者的舌部位置和压力，设计了一套无线遥测系统。唇、舌压力由嵌入上、下牙弓薄塑料板内的高灵敏度微压力计测量。用倾斜仪评价头部姿态。数据通过无线信号从便携式处理器传输到数据输入系统，这样受试者就不需要呆在实验室里，可以四处走动。结果如下：1)稳定病例术后舌部接触无变化或减少。不稳定组舌接触量增加（p<0.01）。2)术后舌接触量无明显变化。3)头屈程度大，舌部接触压力大（p<0.0 1）； 4)开放咬合组压力略低于正常咬合组；5)应用MFT后，舌部接触压力明显增加。特别是前腭区压力和接触量显著增加（p<0.05）。一种新开发的无线遥测系统可用于检测日常活动中舌头的接触和压力。结果表明，牙列的接触和压力可能是保持良好咬合的重要因素之一。

Malposition of the tongue is recognized as a possible cause of malocclusion, yet there has been no optimal system to measure its position and pressure for long hours during daily activities. A wireless telemeter system was fabricated in order to measure the tongue position and pressure in openbite patients for long hours in natural condition.Lip and tongue pressures were measured by the high sensitive micro-pressure gauges embedded into the thin plastic plates on the upper and lower dental arches. Head posture was evaluated by the inclination meter. The data were transmitted by the wireless signals from a portable processor to the data input system so that the subjects did not need to stay at the laboratory and were able to go around.The results obtained were as follows :l) Tongue contact at the stable case did not change or decreased post-surgically. On the other hand, unstable case showed increasing of it.(p<0.01)2) Tongue contact of the patient who received glossectomy did not change post-surgically.3) Great degree of head flexion corresponded to a larger contact and pressure of the tongue.(p<0.0 1)4) The pressure of open bite cases were slightly lower than that of normalocclusions5)The contact pressure was increased significantly by the applying of MFT.Especially, the pressure and contact were highly increased at the anterior palateregion.(p<0.05)A newly developed wireless telemeter system is useful to detect the tongue contact and pressure during daily activities. And the results suggest that the contact and pressure to the dentition might be one of the important factors to keep a good occlusion after the orthognathic surgery.