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The aim of this review article is detailed analyzation of the effect of sodium hypochlorite on the structural components of dentin. This compound is one of the strongest antimicrobial medicines for root canal treatment. However, sodium hypochlorite in certain concentrations has a detrimental effect on dentin, which leads to the loss of its physicochemical properties.Materials and methods. The study of publications was produced in the electronic databases such as Google Scholar, PubMed and ScienceDirect in the course of a systematic review of the literature. Included articles contain information about the on the effect of sodium hypochlorite on the structural components of dentin and the harmful effects of medicines for root canal treatment on organic elements.Results. 67 articles were viewed during the rview. After analyzing the literature for inclusion criteria, the total number of publications has become 43.Conclusions. According to the literature, it can be assumed that an increase in sodium hypochlorite concentration and its exposure time can lead to depletion of dentin organic matrix, which in turn, is responsible for the root fracture.

The aim of this review article is to determine the positive and negative qualities and properties of restoration structures based on fiber posts. After endodontic treatment, it is necessary to strengthen the remaining tissues, since there is an irreversible decrease in the strength characteristics of the tooth.Materials and methods.Produced a systematic review of the literature in the electronic databases Google Scholar and Pubmed. Articles based on the method of using fiberglass posts in clinical practice, analysis of methods for modifying the adhesive preparation of the dentin surface and the post itself, as well as publications related to the discussion of factors that led to the success/failure of the treatment are considered were included.Results. 45 articles were reviewed in the course of information collection. As a result of the submitted articles analysis according to the exclusion criteria, the number of included studies has become 39.Conclusions. Based on the literature studied, the use of structures based on fiber posts is an acceptable method ofpost-endodontic restoration of teeth. But, like any medical manipulation, it has its limitations and side effects.