[Study on analysis of viscoelastic property of palatal mucoperiosteum--about the creep recovery].
The purpose of this study was to analyze the creep phenomena of the palatal mucosa under pressure and after pressure release. The measuring device consisted of the control box, which regulated the loading force by air pressure, and the pick-up, which was fixed to the teeth and applied the load onto the mucosa, detected the displacement of the mucosa. The creep was analyzed by the Voigt 4 element model. The ratio of the recovery (S1'/S1, S2'/S2) and the recovery percentage were analyzed on the creep after the pressure release and evaluated from the point of expressing exactly the viscoelastic recovery. The results were as follows: 1. Both the amount of the displacement under pressure and the recovery of the palatal mucosa showed the least value at the center site and at the other sites less at the distal site than the mesial site. 2. The ratio of S1'/S1 was about 0.5 at all sites. On the other hand, the ratio of S2'/S2 showed values higher than 1 except at the center site and was significantly different among the other sites. 3. It was pointed out that the recovery percentage was more suitable than the ratio of the recovery to explain the viscoelastic recovery of the palatal mucosa.
Hirano
S
S
Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University.
D000328:Adult; D001696:Biomechanical Phenomena; D004548:Elasticity; D006801:Humans; D008297:Male; D009061:Mouth Mucosa / Q000502:physiology*; D010159:Palate; D010521:Periosteum / Q000502:physiology*; D011312:Pressure; D014783:Viscosity