Clinical study on tooth mobility

这次，我们开发并改进了单脉冲叩诊装置，并进一步对叩诊尖端的材料和叩诊距离进行了评估。接下来，在种植了人工牙的模型上测量了牙齿振动，并测量了各种牙齿和牙周组织在叩诊方向上的厚度差异。结果表明：1.就材料而言，压克力显示出最小的变异系数的人力的加速度。撞击距离表现出1.0和2之间的变异系数小。Omm.3.不同牙型的最大加速度功率以上颌第一磨牙最小，其次是上颌第一前磨牙和上颌中切牙。持续时间的趋势是相同的。随着牙周膜厚度的增加，加速度的最大功率逐渐增大。结果是相同的持续时间。在打击功率方面，如果打击功率减小，则加速度最大功率的减小率在上颌第一磨牙牙周膜厚、薄和第一前磨牙薄时变大。在任何状态下均未观察到持续时间的变化。

This time, we have developed and improved a single impulse percussion device and further made an assessment regarding the material of percussion tip and percussion distance.Next, measurement was made of dental shaking on a model on which artificial teeth are planted and also differences of the thicknesses of teeth in various kinds and periodontium in the direction of percussion. As a result, the following results have been obtained :1. Regarding the material, acryl showed the smallest coefficient of variation in the man power of the acceleration.2. Percussion distance exhibited small coefficients of variation between 1.0 and 2. Omm.3. The max power of the acceleration by kind of tooth was the smallest in the maxllary first molar followed by the maxillary first premolar and maxllary central incisor in the order. The trend was the same regarding duration time.4. Regarding the thickness of the periodontium, thicker it is, the max power of the acceleration became larger. The result was the same regarding duration time.5. Regarding percussion power, if, it decreases, the decreasing rate of the max power of the acceleration became large when the periodontium of the maxillary first molar was thick and thin and when the first premolar was thin. No change was observed in duration time in any state.