A New Way to Model Periodontitis in Laboratory Animals.

Unlabelled: The prevalence of periodontal diseases is increasing, tends to increase with age and is considered as one of the main causes of tooth loss. To assess the effectiveness of new methods of treatment of periodontal diseases, studies on laboratory animals can be promising.

The Aim Of The Study: to develop a new method of accelerated modeling of experimental periodontitis on laboratory animals.

[Research and comparative characteristic of the factors determining elasticity of the human skin].

Changes in skin elasticity have been analyzed under different conditions (upon skin stretching, at different thickness of the skin, at different contents of collagen, intercellular and endocellular liquids, upon changes of venous pressure, and during contraction and relaxation of smooth muscles in skin vessels - vasomotions). Elasticity was defined by the acoustic method from the speed of diffusion of a superficial sheared acoustic wave in the skin, by the autoresonant method from the mechanical resonance frequency of skin, and from the vacuum pressure needed for skin site deformation of constant volume. It was shown that the major factors determining the elasticity of skin are it stretching, thickness, and the contents of collagen and liquids in it.

[A new method for examination of human skin vasomotions].

An original method for determination of elasticity of biological tissues from their resonance frequency has been devised. The method can be used for detection and spectral analysis of small oscillations of skin elasticity caused by vasomotions.