Dystrophic changes of all periodontal structures and teeth in patients with periodontitis and generalized periodontitis were investigated in the study. Characteristic signs of the gums’ pathological contour, as well as other clinical and radiological features of dystrophy differ in patients with periodontitis and generalized periodontitis and contribute to the improvement of their differential diagnosis. Ultrastructural examination of the patients’ gums with periodontitis revealed disseminated microthrombosis, mucoid edema and fibrinoid transformation of intermediate connective tissue, and coagulation-dystrophic changes in periodontal tissues and cells.
Key words: periodontitis, parodontosis, gingival ultrastructure, coagulation dystrophy

Introduction: The treatment of most diseases in dentistry is related to the local application of antiseptic drugs that allow regulating the microbiocenosis in the oral cavity. The study of pharmacodynamic and kinetic parameters of the release of active pharmaceutical ingredients (API) from the dosage form (DF) is an important task. In this study, we tried to evaluate the release of API from developed dental medicinal films (DMF) produced on a polymeric basis.
Methods: To confirm the antimicrobial activity of the three developed DMF with amizon, decamethoxine and chlorhexidine digluconate, a statistical analysis and mathematical processing of the research results were carried out.
Results: Statistical processing made it possible to organize the results of our earlier studies, in which the concentrations of three API (amizon, decamethoxine and chlorhexidine digluconate) were determined during their diffusion from the polymer base of the DMF to the aqueous dispersion medium (0.9% sodium chloride solution). Due to performed statistical calculations, regarding the reliability of API release, it was determined that the time duration of complete release of the three active substances from the polymer base were different, which will ultimately affect the duration of the pharmacological effect of the API in the patient's body.
Conclusion: In the manufacture of DMF on a polymeric base of hydrophilic type, it is necessary to take into account the release time of each API, according to the composition of the polymeric coatings.

Dystrophic changes of all periodontal structures and teeth in patients with periodontitis and generalized periodontitis were investigated in the study. Characteristic signs of the gums’ pathological contour, as well as other clinical and radiological features of dystrophy differ in patients with periodontitis and generalized periodontitis and contribute to the improvement of their differential diagnosis. Ultrastructural examination of the patients’ gums with periodontitis revealed disseminated microthrombosis, mucoid edema and fibrinoid transformation of intermediate connective tissue, and coagulation-dystrophic changes in periodontal tissues and cells. 
Key words: periodontitis, parodontosis, gingival ultrastructure, coagulation dystrophy