[The role of neuro-psychic diseases in the etiology of periodontosis].

Experimental, clinical and statistical studies on the effect and connection between the neuro-psychic diseases and the diseases of periodontium have been described and analyzed. Attention is drawn to the effect of the second signal system and stress states and diseases (with psychogenic, emotional character). The mechanism of stress effect is explained by the law of dialectic for unity and struggle of opposites. The possibility of stress states becoming etiological factors or morbid conditions for periodontium diseases is well grounded.