权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Assessment of visco-elasticity of the periodontium by means of simultaneous recording fo tooth oscillation and peripheral circulation

通过同时记录牙齿振动和周围循环来评估牙周组织的粘弹性

基本信息

批准号：
06672061
负责人：
AKIYAMA Youichi
金额：
$ 1.28万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The tooth pulsates due to blood flow through capillary vessels of the periodontal membrane. The purpose of the present research was to obtain an index for assessment of the peripheral circulation and visco-elasticity of the periodontium through the measurement of tooth oscillation with an Amorphous core multivibrator senser.First, to obtain the norm of tooth oscillation of the unaffected periodontium, the recordings of 23 central incisors with healthy periodontal membrane were analyzed. (1) The mean amplitude of the labio-lingual derection (0.59mum) and the variations were smaller than the tooth axis deirection (0.88mum) . (2) The tooth pulsated as late as 0.11-0.13 sec after R-wave of electrocardiograph. (3) The three measurement points at the labial surface moved in a similar direction in 16 teeth, and showed different trends in the others. (4) Two patterns of the power spectrum were observed. One in which the power of the spectrum decreased gradually with increased frequency, the other was that the depression is seen at the midst of the spectrum.Second, the possibility of the index of the optimum force were estimated from the measurement of tooth oscillation at the beginning of the tooth movement, a month after the first premolar, the upper left canine were pushed by the orthodontic force of about 0,20,60 and 120 grams. At resting condition of 0 gram, the pulsation synchronized with the heart rate in which the amplitude was 0.15 mum. The amplitude at the force of 20 grams increased slightly. This suggested that the blood flow was still secured under the pressed periodontal membrane. At the force of 60 and 120 grams, the amplitudes were almost 0.1 and under 0.05 mum, respectively. This decreased amplitude indicated that the blood flow in the periodontal membrane was impeded as the force imcreased.

由于血液流过牙周膜的毛细血管，牙齿脉动。本研究的目的是通过非晶磁芯多谐振动传感器测量牙齿振动来获得牙周组织的外周循环和粘弹性的评价指标。首先，为了获得正常牙周组织的牙齿振动的标准，分析了23个具有健康牙周膜的中切牙的记录。(1)唇舌方向的平均振幅（0.59 μ m）及其变化小于牙轴方向的平均振幅（0.88 μ m）。(2)在心电图R波后0.11-0.13秒出现搏动。(3)唇面3个测量点在16颗牙齿中的移动方向基本一致，在其他牙齿中的移动方向不同。(4)观察到两种模式的功率谱。第二，通过测量牙齿移动开始时的牙齿振动，估计最佳力指数的可能性，第一前磨牙，左上尖牙被正畸力推动约0.20，60和120克。在0克的静息条件下，脉动与心率同步，其中振幅为0.15 μ m。在20克力下的振幅略有增加。这表明在受压的牙周膜下，血流仍然是安全的。在60和120克的力下，振幅分别为几乎0.1和0.05 μ m以下。这表明牙周膜中的血流随着力的增加而受阻。