THE DEVELOPMENT OF AN INSTRUMENT OF MEASURE PERIODONTAL TISSUE WITH DAMPED OSCILLATION OF TEETH

牙周活动度的测量是临床上评价牙周组织及其他牙周状态的重要方法。一个目标吸引了很多人的注意。为了建立一种客观的牙周时间包括牙齿移动度的评价方法，本课题课课组研制了“阻尼振荡系统”仪器，研究了传感器位置、牙根模型的大小、形状和数量等不同阻尼振荡条件下动态参数（阻尼固有频率、弹性常数、粘性常数和弹性与粘性之比）的变化。并与两种商用仪器“牙周检测仪”和“牙齿活动度检测仪”进行了对比研究，提前投入临床使用。结果表明：1)当用锤击法从水平方向和垂直方向水平移动检测传感器位置时，随着检测传感器与齿模型距离的增加，各动态参数值均减小。2)水平攻丝垂直移动检测传感器位置时，除弹性常数与粘性常数之比外，动态参数随检测传感器与齿模型顶部距离的增加而增加。另一方面，垂直攻丝时，动态参数的所有值都没有明显变化。3)当根距改变时，根距的增大使动态参数降低。平行冲击与垂直冲击的对比显示出较大的差异。4)当分岔区位置改变时，位置越高，动态参数越低。无论弹性常数与粘性常数的比值如何，都没有明显的变化。平行垂直角度冲击的结果也有显著差异。5)通过对市面上常用的定量评价牙周迁移率的仪器“牙周测试仪”和“牙齿迁移率检测仪”进行比较，发现新研制的阻尼振荡系统通过引入动态参数来掌握牙周组织的特性。少

The measurment to tooth mobility has been recognized clinicaly as an important method to evaluate periodontal legament and other periodontal states. An objective attracted a lot of attention. In order to establish an objective evaluation method for periodontiume, including tooth mobility, this project study groupe has been developed an instrument "Damped Oscillation System" an studied dynamic parameter change (damped natural frequency, elastic constant, viscous constant and the ratio of elastic constant to viscous constant) by diff-erent conditon of Damped Oscillation including the position of sennsor, the size, shape and number of root model. And also, a comparative study with two commercial instrument, "perio-test" and "tooth mobility checker" were compleated, in advance to clinical use.Results are followed :1)In the case of moving the position of the detecing sensor horizontaly by hammer tappings from both horizontal and vertical directions, all values of the dynamic parameter decre … More ased as the distance between the detecting sensor and the tooth model increased.2)In the case of moving the position of the detecting sensor verticaly by horizontal tapping, the dynamic parameter increased as a distanse between the detecting sensor and the top of the tooth model increased, except the ratio of elastic constant to viscous constant. On the other hand, by vertical tapping, no significant change of all values of the dynamic parameter was recognized.3)When the distance between the roots was altered, an increase in distance between the roots lowered the dynamic parameter. The comparison between parallel and perpendicular percussion showed a large difference.4)When the location of the furcation area was altered, higher locations produced a lower dynamic parameter. There was no identifiable change regardless the ratio of elastic constant to viscous constant. There was also a significant difference between the result for paralleland perpendicular angle percussion.5)As compared two commercial instrument, "perio-test" and "tooth mobilitychecker" which were able to evaluate the mobility in quantitative manner, it was shown that newly developed device, damped oscillation system, was able to grasp the periodontium characteristics by introducing dynamic parameters. Less