Yatabe M
First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University.
Kokubyo Gakkai Zasshi. 1991 Mar;58(1):74-94. doi: 10.5357/koubyou.58.74.
The purpose of this study is to investigate the viscoelastic properties of the oral mucosa. The handy apparatus which can easily show the rheological properties (i.e., G', G", tan delta) was made for the trial. The principle of this apparatus is to measure the stress and the phase difference produced when the constant sinusoidally oscillating shear deformation is loaded on the viscoelastic materials. This handy trial apparatus was found to be applicable in vivo, as evaluated by the dynamic spectrometers. The viscoelastic properties of the mucosa of the maxilla were investigated with this apparatus. The results were as follows: 1) Viscoelastic values varied in individual cases. 2) In the maxillary ridge area and the median portion, the values of modulus G and tan delta were low. In other words, the stiffness of these areas was low and the recovery from deformation was fast. 3) The values of modulus G and tan delta were high in the side region of the palate. The result showed that in this area there was a high stiffness and the recovery from deformation was slow. 4) In the incisive papilla and the area of flabby gum, the values of modulus G were low and the values of tan delta were high. The low stiffness and the slow recovery from deformation were shown in these areas.
本研究的目的是调查口腔黏膜的粘弹性特性。为此试制了一种能轻松显示流变特性（即G'、G''、tanδ）的简便装置。该装置的原理是测量在粘弹性材料上施加恒定正弦振荡剪切变形时产生的应力和相位差。通过动态光谱仪评估发现，这种简便的试验装置适用于体内研究。使用该装置对上颌黏膜的粘弹性特性进行了研究。结果如下：1）粘弹性值在个体病例中有所不同。2）在上颌嵴区域和正中部分，模量G和tanδ的值较低。换句话说，这些区域的硬度较低，变形恢复较快。3）腭部侧面区域的模量G和tanδ值较高。结果表明，该区域硬度较高，变形恢复较慢。4）在切牙乳头和松弛牙龈区域，模量G值较低，tanδ值较高。这些区域显示出低硬度和缓慢的变形恢复。
