The authors examined a group of 979 subjects with fixed prosthetic appliances, admitted for treatment at the periodontological department on account of periodontopathy. The group was subdivided according to sex, age, periodontological diagnosis and type of fixed prosthetic appliance. Based on the results of the initial examination, the authors compared the state of the periodontium of teeth with a prosthetic appliance and the other teeth using Russell's clinical and X-ray PI index. They investigated the oral cavity, using the OHI-S index according to Green and Vermillion and the DMF index. The results confirmed the negative influence of fixed prosthetic appliances on the periodontium and revealed the necessity of X-ray check-ups of the periodontium of teeth white these appliances.