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Relevance. It is known that endodontically treated teeth have a lower survival rate compared to vital teeth. This is due both to changes in the hard tissues of the tooth, and to the use of inadequate technologies for their restoration. Therefore, the methods of restoration of such teeth are very relevant. But their application should be conditioned by their scientific substantiation using fundamental research methods, which determined the relevance of this study.Material and methods. The study of the structural and functional characteristics of the restoration was carried out by scanning electron microscopy in the area of the restoration border, the border of the material-pin insert, the ledge area and the surface of the restoration material. For this purpose, 60 periodontal removed teeth with an IROPZ index of 0.8 or more were used, of which 120 restoration samples were made from the standard form of the composite and 120 restorations from the core-composite using a fiber-optic pin in both groups.Results and discussion. In the course of the study, it was found that the data obtained in the study of the morphology of the restoration in group No. 1 indicate insufficient adaptive properties of the traditional form of the composite (porosity, cohesive fractures, violation of the marginal fit); The results of SEM testify to the advantages of the core-composite, which has a homogeneous, micro-rough, adhesive surface free from technical impurities, suitable for the use of all currently used methods of fixing an orthopedic structure.

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.

The dentist on therapeutic reception is always a matter of choice, of choosing a particular method or material in a particular clinical situation. This relates to the question of the application of endodontic systems: for or against? Unfortunately, it is uncertain at what minimum amount you need to use pins. It is also necessary to remember about the anatomical features of the teeth and roots that need to be considered when selecting endodontic systems. And, of course, fixing the posts on syler, we must achieve coronal and root of Hermeticism. In this paper, we conducted a comparative analysis of microbacteria of sileru used for fixing different in its structure posts: fiberglass and anchor pin. The teeth were divided into 2 groups. In the first group studied the permeability of glass ionomer material Fuji 9, on which were fixed anchor pins in the second group used the fiberglass pins for the cementation which used self-adhesive composite cement Relyx U200. When comparing adhesive fixation strength of different materials noted that the cement Relyx U200 provides the highest rate.

The emergence of modern materials for therapeutic dentistry significantly increased the possibility of clinicians to conduct restoration of severely damaged teeth. We present a clinical case of recovery of the damaged tooth crown. After the root canal obturation by thermafills a surgical lengthening of the tooth crown was conducted. Then the tooth was restored with the help of fiberglass post fixed on the dual-curing cement and subsequently covered with all-ceramic crown. In cases of fracture of the clinical crown of the tooth crown lengthening surgery and restoration of the tooth with the use of «post-and-core» system is a good alternative to prosthetics on implants in cases of absence of the pain, tooth mobility within the normal range and the possibility of providing high-quality endodontic treatment.

A new technique for evaluation of adhesive bond strength of fiber posts is presented. It called by the authors the “torque-out” test. Unlike the known test methods, in which a tensile or compressive load is applied to the sample, the load is produced by the torque. Samples for testing of a specific combination of post and cement can be manufactured chairside without using of special equipment. A compact installation developed by the authors designed to assess the adhesive bond strength of the connection by the value of the maximum torque is described. Using numerical modeling, the stress-strain state that occurs in the samples during push-out and torque-out tests was compared.