Development of viscoelastic measurement system and histological examination of periodontal ligament and alveolar bone.

牙周膜和牙槽骨粘弹性测量系统的开发和组织学检查。

• 批准号: 03670979
• 负责人: SHIBASAKI Yoshinobu
• 金额: $ 0.51万
• 依托单位: SHOWA 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: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03670979/
• 关键词: Tooth mobility; Laser Displacement Meter; Non-contact sensor; Frequency; Viscoelastic property; FFT; 歯周組織; レ-ザ-変位計; インパルス加振; 周波数分析

It is imperative to clarify the changes in periodontal tissues during orthodontic treatment in terms of not only tooth movement but retention. Orthodontic treatment involves various kinds of changes in which, particullary, tooth mobility is said to reflect viscoelastic property of periodontal ligament and alveolar bone as correctly as they are.In this study, a new system for an assessment on a dog's tooth mobility was developed in order to compare histological findings with tooth mobility.Minimization of the loading mass to a tooth is essential for the measurement of the tooth mobility accurately. Furthermore a sensor should be conditioned as a lighter or possibly a non-touched type. In the preliminary experiment we examined the possibility and accuracy of the measurement of tooth mobility on the simulation models using Laser Displacement Meter (LDM).Then, in the experimental dogs, the quantity and phase of displacement were measured with loading forces at the lingual surface of 3rd incisors. At the same time vibration was given by an impulse hammer and the frequency was analyzed by FFT real time analyzer.The results on the simulation models showed high accuracy of this measuring system, which were 2.7% at 200g and 1.3% at 500g. The frequency peaks were shown with the same spectrum.On the dog's teeth the quantities of displacement were 18 mum at 50g, 38mum at 100g, 47 mum at 200g, 65mum at 500g, respectively, with a frequency peak of 375 -600Hz.In conclusion it was suggested that this system is suitable enough to investigate the temporal changes in tooth mobility in orthodontic tooth movement in dogs.

必须澄清正畸治疗过程中牙周组织的变化，不仅包括牙齿移动，还包括牙齿固位。正畸治疗涉及各种变化，其中，特别是牙齿松动度据说可以准确地反映牙周膜和牙槽骨的粘弹性特性。在这项研究中，开发了一种评估狗牙齿松动度的新系统，以便将组织学结果与牙齿松动度进行比较。最小化牙齿的负载质量对于准确测量牙齿松动度至关重要。此外，传感器应设置为打火机或可能为非接触式。在初步实验中，我们检查了使用激光位移计（LDM）在模拟模型上测量牙齿松动度的可能性和准确性。然后，在实验犬中，在第三门牙舌面施加加载力时测量位移的数量和相位。同时通过脉冲锤给出振动，并通过FFT实时分析仪分析频率。仿真模型的结果表明该测量系统具有较高的精度，在200g时为2.7%，在500g时为1.3%。频率峰值具有相同的频谱。在狗的牙齿上，位移量分别为50g时18μm、100g时38μm、200g时47μm、500g时65μm，频率峰值为375-600Hz。综上所述，该系统足以研究狗正畸牙齿移动中牙齿松动的时间变化。