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

舌的错位被认为是咬合不正的一个可能原因，但一直没有最佳的系统来测量其位置和压力长时间在日常活动。为了在自然状态下长时间测量开牙合患者舌位和舌压，研制了一套无线遥测系统，利用高灵敏度的微压计，在上下牙弓的塑料薄片上嵌入微压计，测量唇压和舌压。头部姿势由倾斜仪评估。数据通过便携式处理器的无线信号传输到数据输入系统，使受试者无需呆在实验室，能够四处走动，获得的结果如下：1）舌接触在手术后稳定的情况下没有改变或减少。另一方面，不稳定的情况下，显示它的增加。（p<0.01）2）舌切除术后患者舌接触无明显变化。3）头屈曲度越大，舌接触越大，舌压力越大。（p<0.01）4）开牙合患者的压力略低于正常牙合患者。5）施加MFT后，接触压力明显增加，尤其是腭前区的压力和接触压力明显增加。（p<0.05）新开发的无线遥测系统可用于检测日常活动中的舌接触和压力。结果提示，牙列的接触和压力可能是正颌手术后保持良好咬合关系的重要因素之一。

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.