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

利用脉冲锤对牙周组织进行自由振动状态评价，得到以下结果：1.牙周组织的自振状态。结论：1.在粘性阻力与牙周膜相似的拔牙种植模型中，即使振动力不精确恒定，单根牙和多根牙仍表现出一定的振动模式。拔牙制作牙周病模型，振动反应减弱。在人类健康的完整牙齿中，无论振动强度如何，每颗牙齿都表现出几乎相同的反应。在牙齿中，部分振动强度降低。这些结果表明，该方法在牙周病的诊断中是可行的。

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.