Symmetry as a source of hidden coherent structures in quantum physics: general outlook and examples

A general algebraic approach, incorporating both invariance groups and dynamic symmetry algebras, is developed to reveal hidden coherent structures (closed complexes and configurations) in quantum many-body physics models due to symmetries of their Hamiltonians $H$. Its general ideas are manifested on some recent new examples: 1) G-invariant bi-photons and a related SU(2)-invariant treatment of unpolarized light; 2) quasi-spin clusters in nonlinear models of quantum optics; 3) construction of composite particles and (para)fields from G-invariant clusters due to internal symmetries.Comment: 10 pages, LATEX; Proceedings of VIII Int. Conf. on Symmetry Methods in Physics (Dubna, July 28-August 2, 1997

Clinical and morphological aspects of structures based on fiberglass posts use

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

Dental Implant Treatment Features in Patients with Type 1 Diabetes Mellitus: A Systematic Review

Aim to determine the impact of diabetes mellitus, particularly the type one, on the success of dental implant treatment. Electronic search of publications in the databases such as Google Scholar, PubMed, Embase in the course of a systematic review of the literature was conducted. Included articles contain information about the impact of type 1 diabetes mellitus (T1DM) on the quality of dental implantation, bone tissue and osteointergation of implants. 88 articles were viewed during the review. After analyzing the literature for inclusion criteria, the total number of publications has become 35. According to the reviewed literature, uncontrolled type 1 diabetes can negatively affect the quality of implantation. Constant monitoring of glucose levels in compromised patients can increase the success rate of dental implantation. © 2020. All Rights Reserved