Digital analysis of teeth treated with the Hall technique

INTRODUCTION: The information about digital examination provided by the scientific literature is quite insufficient. Therefore, digital examination of the occlusion is an object of analysis not only in Bulgaria but in other countries as well. No evidence for digital occlusal analysis on Hall-crowned teeth was found in the prosthetic part of the pediatric dentistry.AIM: The aim of this article is to conduct a study on the occlusal balance with T-scan after treatment with preformed metal crowns (PMCs) using the Hall technique.MATERIALS AND METHODS: Object of the clinical study were 50 crowned primary teeth. Unit of observation with the T-scan 8 system were occlusal articulation relationships in primary and early mixed dentition after the Hall technique.RESULTS: The results confirmed equal occlusal relationships in both sides – the crowned teeth compared with the symmetrical natural teeth. The occlusal contacts were with a similar value of the summary masticatory force compared with the control group of natural teeth.CONCLUSION: The received data confirmed that the restoration of decayed teeth with preformed metal crowns maintained the occlusal harmony in the dentition

UV-LED Disinfection in Medicine and Dentistry

In 1878, Arthur Downs and Thomas Blunt published an article describing the sterilization of bacteria exposed to light with a short wavelength of 240 to 270 nm. Ultraviolet (UV) light is a form of light that is invisible to the human eye. A unique feature of UV light is that a certain range of wavelengths, those between 200 and 300 nanometers (billionths of a meter), are categorized as bactericidal, meaning that they are able to inactivate microorganisms such as bacteria, viruses, and protozoa. There are different disinfection systems based on UV light in the fields of manufacturing, medicine, and dentistry: open radiation lamps, single lamps for disinfection of surfaces (mainly in the food industry), lamps with reflective surfaces, disinfection cabinets, etc. In relation to the COVID-19 pandemic, the question of the need for disinfection and its effectiveness in treating coronaviruses is particularly relevant. The purpose of this article is to examine light-based disinfection, the development of technology over time, and the latest advances in technology. Today, this is of paramount importance for both fields of occupational and public health

The Optimization Principles of the System Mass Blast-Protected Structure

The real work is ideological result of the investigations, which have been carried out for 25 years, on structural dynamics under the seismo-explosive loads, induced by industrial and experimental blasts, simulating natural earthquakes, and on the optimization parameters of drill explosive works in the mining quarrels

Dental prosthetics and temporomandibular disorders

Introduction: Edentulism, especially in the support areas, as well as pathological tooth wear (abrasion and attrition) of the hard dental tissues leads to a decrease in occlusal height and posterior translocation of the articular heads in central occlusion. Partial and complete edentulousness of patients disturbs their occlusal, phonetic function, as well as aesthetics.Aim: The aim of the present study is to investigate the relationship between the type of prosthetic treatment and temporomandibular joint (TMJ) complaints.Materials and Methods: A total of 152 patients who visited the Faculty of Dental Medicine at the Medical University of Varna and underwent prosthetic treatment were examined. The patients were evenly distributed by sex and age. They have been clinically examined and interviewed.Results: Slightly more than half of the patients underwent prosthetic treatment with partial dentures (53.9%), the rest—with complete dentures. Sex dependence was not established while, in terms of age, it was determined that the mean age was 64.5 years for patients treated with complete dentures and 57.2 years for partial dentures (p < 0.001). There was a significant difference in the type of dentures and complaints related to TMJ dysfunction (p = 0.030), finding that the likelihood of TMJ dysfunction in patients with complete dentures increased more than twice (OR = 2.124 (1.030–4.381); p < 0.05).Conclusion: The probability of TMJ dysfunction in patients with complete dentures is much higher than in those treated with partial dentures. Regardless of the type of the dentures, females are more prone to TMJ complaints

Physical and numerical simulation of two-phase flow in the area of mini-channel

The results of physical and numerical modeling to determine the rate of evaporation of ethanol, at a flow of air flow velocities in the range of 0.0139 - 0.139 m/s and temperature in the range of 10 - 45 °С are placed. The time of the establishment of the diffusion equilibrium in the work area and differences in the results of numerical and physical modeling are have determined

Modeling the evolution of the aerosol cloud of toxicants in the atmosphere

Using the methods of mathematical modeling, the formation and evolution of aerosol clouds of toxicants in the atmosphere from the chemical industry enterprises, thermal power engineering and rocket carriers of space vehicles is analyzed. The processes of dynamic interaction of drops between themselves and a two-phase flow, processes of agglomeration, crushing and evaporation of aerosol particles are taken into account. The results of numerical calculations are presented

Analysis of the Influence of Modes of Plasmachemical Synthesis and Precursor Evaporation on Geometric Characteristics of Ceramic Powders Produced

Mathematical model of evolution of a liquid precursor droplet in the process of plasma-chemical transformations for production of micro- and nano-structured ceramic powders on the basis of metal oxides is described. A criterion of production of particles with different morphology is determined. The results of numerical analysis are given

CONDITIONS OF FORMATION OF CREATIVE ACTIVITY OF STUDENTS BY MEANS OF INFORMATION – COMMUNICATION TECHNOLOGIES

The article deals with the problem of formation of creative activity among students in the process of using information and communication technologies (ICT) in the educational process of a higher educational establishment: features, prospects and conditions for effective formation of creative activity. The article describes an empirical study of the current level of formation of students' creative activity, gives examples of creative tasks developed by using ICT and recommendations for optimizing of the process of forming students' creative activity by means of ICT tools.

SOCIAL REHABILITATION OF PEOPLE WITH INTELLECTUAL DISABILITIES USING ART THERAPY METHODS

The article considers the problem of social rehabilitation of people with intellectual disabilities: analyzes the category of «disability» as a social phenomenon, summarizes the current approaches and social practices of foreign and Russian scientific schools in the context of the problem being studied, theoretically reveals the potential of art–therapeutic methods in organizing social rehabilitation of people with disabilities in accordance with the specifics of disabilities.The article describes an empirical study, in the course of which the features of social orientation of people with intellectual disabilities, their adaptive mechanisms and creative potential are revealed. The material of the article includes a description of the author's project “Art without Borders”, aimed at the socio–cultural rehabilitation of people with intellectual disabilities and the development of their creative potential using art therapy methods. The results of the study can be the basis for designing a system of social rehabilitation of people with intellectual disabilities.

Modeling of continuous melting of quartz-feldspar raw materials of subsequent flow from the plasma heating

The problem of obtaining easy-flowing melt silicate-containing materials with the use of low-temperature plasma. A mathematical formulation of the evolution of the silicate-containing raw material to the melt. The analysis of the preliminary results