Being a part of the system of mucous membranes, gum epithelium takes a proactive stance in reactive changes initiated by irritant factors of external and internal environment. The purpose of this study is to define reactive changes of quality parameters of gum epithelial cells under metal-ceramic constructions. The material for this research was provided by gum epithelium, which was picked from the patients subjected to the replacement of defected hard tissues of the teeth by means of metal-ceramic constructions.

Сonclusions. The available change of tinctirial properties of epithelial cells reveals possible subsequent directions of pathomorphologic changes of mucous membranes of gum under metal-ceramic constructions.