ENAMEL RESISTANCE IN CHILDREN WITH MALOCCLUSIONS.

The purpose of the study was to evaluate the functional resistance of enamel in children with malocclusions. Material and research methods: there were examined 579 children aged 12-16 years with malocclusions and was determined the functional enamel resistance. The data obtained in the study indicate that the prevalence of malocclusions among examined children, according to the average data, is 67,76±1,99%.

Light-cured dimethacrylate dental restorative composites under a prism of annihilating positrons.

Background: Breakthrough resolutions in current biopolymer engineering rely on reliable diagnostics of atomic-deficient spaces over the finest sub-nanometer length scales. One such diagnostic is positron annihilation lifetime spectroscopy, which probes space-time continuum relationships for the interaction between electrons and their antiparticle (positrons) in structural entities like free-volume defects, vacancies, vacancy-like clusters, interfacial voids and pores, etc.

Objectives: This paper is intended to highlight the possibilities of positron annihilation lifetime spectroscopy as an informative instrumentation tool to parameterize free-volume evolution in light-cured dimethacrylate dental restorative composites exemplified by Charisma® (Heraeus Kulzer GmbH, Hanau, Germany) and Dipol® (Oksomat-AN Ltd, Kyiv, Ukraine).

[Cytokine dysregulation in children with chronic catarrhal gingivitis living in polluted areas with fluoride and iodine deficiency].

The aim of the research was to study the state of oral liquid immunity in children with chronic catarrhal gingivitis living in unfavorable environmental conditions. The study included 190 children with chronic catarrhal gingivitis (CCG): 110 children aged 7, 12 and 15 years and residing in ecologically unfavorable areas of Lviv region and 80 children living in 'conditionally clean' region which constituted comparison group. Children with CCG from polluted areas had increased content of pro-inflammatory cytokines and reduction of anti-inflammatory cytokines compared to controls.

Light-Curing Volumetric Shrinkage in Dimethacrylate-Based Dental Composites by Nanoindentation and PAL Study.

Light-curing volumetric shrinkage in dimethacrylate-based dental resin composites Dipol® is examined through comprehensive kinetics research employing nanoindentation measurements and nanoscale atomic-deficient study with lifetime spectroscopy of annihilating positrons. Photopolymerization kinetics determined through nanoindentation testing is shown to be described via single-exponential relaxation function with character time constants reaching respectively 15.0 and 18.

[Incidence of malocclusion in children living in areas with high fluoride content in water].

The paper presents the results of orthodontic examination of 503 schoolchildren from the region with high content of fluoride in drinking water. It was found that the prevalence of malocclusions in the examined population subgroup was 71.38 ± 2.