Study to analysis of teeth and periodontal tissue vibration character and application to the diagnosis of periodontal disease

我们用脉冲锤自由振动法评估了牙周组织的状态，得到了以下结果。拔牙种植模型具有与牙周膜相似的粘性阻力，单根牙和多根牙在激振力不是精确恒定的情况下，均表现出一定的振动模式。在用拔牙制作的牙周病模型中，振动响应降低。在人类健康完整的牙齿中，无论振动强度如何，每颗牙齿都表现出几乎相同的反应。在齿部部分的振动响应强度有所降低。这些结果提示该方法在牙周病诊断中的适用性。

We evaluated the state of periodontal tissue by free vibration using an impulse hammer and obtained the folloeing results.1. In an extracted teeth implantation model that showed viscous resistance similar to that of the periodontal membrane, both single-rooted teeth and multi-rooted teeth showed a certain vibration pattarn even when the vibration force was not accurately constant.2. In model of periodontal disease produced using exracted teeth, vibration responses were decreased.3. In the human healthy complete teeth, each tooth showed nearly the same responses irrespective of the strength of vibration. In the teeth partially of the strength of vibration respnses were decreased. These results suggest the applicabillity of this method to the diagnosis of periodontal disease.