Correlation of fillings on the tooth and changes in the tissues having direct contact with the tooth aroused keen interest amongst many professionals. Irregularly shaped fillings can damage the periodontal tissues. The primary indicator of the validity of the dental work is its ability to ensure the preservation of normal physiological status of the tissue, primarily gingival, alveolus and periodontum. The main purpose of this paper is to make histological assessments of the tissue of the interdental region before and after correction of irregular filling in experimental animals. The research was conseived as a histiological study with experimental animals ( rabbits). The tested teeth were divided into two groups: a) the experimental group consisted of teeth with irregular fills, and b)the control group consisted of teeth with regular fillings and healthy teeth. The experiment carried out under general anesthesia. The experiment was being monitored over 12-month period. Having been expired the first part of the experiment , after 6-month period, in experimental animals, it was carried out the second part of the one consisting of the correction of irregular fillings. The second part of thhe experiment was closely monitored a month, three and six months after the correction of irregular filings. After sacrificing the animals, tissue was prepared for histological analysis. Histological analysis showed changes in the periodontal tissues prior to correction of irregular fillings and significant improvementof the tissue of the interdental region after correction of the same ones. The pathological changes occuring in the periodontal tissues are not irreversible since after correction of irregular filligs are being lost mainly.

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