Atmospheric Pressure Plasma Generation System Based on Pulsed Volume Discharge for the Biological Decontamination of a Surface

The research introduces a system for pulsed volume discharges ignition at atmospheric pressure within gaps reaching 125 mm. The corona discharge is used for the volume discharge initiation. A damping oscillations pulse generator is used as a high-voltage power supply. The pulse repetition rate reaches 1 kHz, while the rate of damping high-frequency harmonic oscillations can reach megahertz units. The volume discharge electric and spectral characteristics were analyzed. The study revealed that O2+ emission spectrum dominates in the UV region. The potential of using pulsed volume discharge for cleaning biological surfaces was demonstrated in the research. The survival rate for E. coli under the influence of 15 seconds long pulsed volume discharge has decreased by 30 times

Preparedness of teachers to provide first aid to children with dental injuries

The purpose is to study is to identify the level of knowledge and practical skills of teachers of educational institutions in the city of Yekaterinburg in the issue of providing first aid to children with dental trauma.Цель исследования – выявление уровня знаний и практических умений учителей образовательных учреждений города Екатеринбурга в вопросе оказания первой помощи детям при травме зубов

Analysis of public awareness of emergency care for the trauma of teeth in children

The article presents an analysis of first aid awareness of emergency care for childhood dental trauma among several groups of the population. The analysis was carried out by questioning a group of parents, children and students with the help of a questionnaire compiled according to the basic principles of teeth traumatic injuries treatment, developed by leading experts of the International Association of Dental Traumatology.В статье представлен анализ уровня знания первой помощи при травме зубов у детей среди нескольких групп населения. Анализ проводился путем анкетирования группы родителей, детей и студентов с помощью опросника, составленного согласно основным принципам лечения травматических повреждений зубов, разработанными ведущими специалистами международной ассоциации дентальной травматологии

The choice of anesthesia method during surgical interventions in children in modern outpatient settings

When providing surgical dental care for a child on an outpatient basis, the problem of adequate anesthesia arises. One of the first conditions facing a pediatric dentist is the painlessness of the interventions. This article analyzes the currently relevant methods of pain relief in children at a surgical appointment.При оказании хирургической стоматологической помощи ребенку на амбулаторном приеме возникает проблема адекватной анестезии. Одним из первых условий, которые стоят перед детским врачом-стоматологом, является безболезненность проводимых вмешательств. В данной статье проанализированы актуальные на данный момент методы обезболивания у детей на хирургическом прием

Optical spectra, crystal-field parameters, and magnetic susceptibility of the new multiferroic NdFe3(BO3)4

We report high-resolution optical absorption spectra for NdFe3(BO3)4 trigonal single crystal which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering TN = 33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g-factors. In particular, the values g(perpendicular) = 2.385, g(parallel) = 1.376 were found for the Nd3+ ground-state doublet. We obtain Bloc=7.88 T and |JFN|= 0.48 K for the values of the local effective magnetic field at liquid helium temperatures at the Nd3+ site and the Nd - Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm-1. To check reliability of our set of crystal field parameters we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions Jnn = -6.25 K (intra-chain interactions) and Jnnn = -1.92 K (inter-chain interactions) obtained from fitting agree well with the experimental data.Comment: 13 pages, 8 figures, 2 table

Prevention of sports dental injury

The purpose of the study is to increase knowledge among athletes on the topic of first aid and prevention of acute dental injury.Цель исследования - повышение знаний среди спортсменов на тему оказания первой помощи и профилактики острой травмы зубов

Retrospective analysis of the chronic fibrous pulpitis treatment in temporary molars

The article provides a retrospective analysis of the chronic fibrous pulpitis treatment of in temporary molars in children 4-8 years old. After treatment by vital amputation, resorption of the roots proceeds more physiologically than after treatment by vital extirpation.В статье проведен ретроспективный анализ лечения хронического фиброзного пульпита во временных молярах у детей 4-8 лет. После лечения методом витальной ампутации резорбция корней протекает более физиологично, чем после лечения методом витальной экстирпации

Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic Nd Fe3 (B O3) 4

We report high-resolution optical absorption spectra for Nd Fe3 (B O3) 4 trigonal single crystal, which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering TN =33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g factors. In particular, the values g =2.385 and g =1.376 were found for the Nd3+ ground-state doublet. We obtain Bloc =7.88 T and JFN =0.48 K for the values of the local effective magnetic field at liquid-helium temperatures at the Nd3+ site and the Nd-Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm-1. To check the reliability of our set of crystal-field parameters, we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions Jnn =-6.25 K (intrachain interactions) and Jnnn =-1.92 K (interchain interactions) obtained from fitting agree well with the experimental data. © 2007 The American Physical Society

Fluorides and their effect on metabolism in the mouth

The article describes the mechanisms of the preventive action of fluorides in the oral cavity, as well as their toxic effect in case of excessive intake, according to the literature.В статье на основании данных литературы описаны механизмы профилактического действия фторидов в полости рта, а также их токсическое действие при избыточном поступлени

Microbiological evaluation of the effectiveness of complex treatment of aggressive periodontitis with laser curettage of periodontal pockets

The aim of the study was to investigate the effectiveness of complex treatment including curettage using a diode laser in patients with generalized aggressive periodontitis. A total of 112 systemic healthy people, from 11 to 35 years old, were included in the study. The real-time Polymerase Chain Reaction (PCR) method was used for detection of periopathogens. The present study showed that the complex treatment may lead to a significant reduction of periopathogens over the 1 - year monitoring period. After the first stage of treatment identifying the most aggressive microorganisms P.g., T.f. and T.d. in an amount of more than 105 decreased from over 60 % to 32 %, 39 % and 34 % respectively. After 1 month of using diode laser incidence of these bacteria has decreased even more and reached 9 %, 19 % and 11 % respectively. Median content of anaerobic microorganisms decreased from more than 106 before treatment to 103 after 1 month of using a diode laser. The results were maintained over one year of observations with regular maintenance therapy.Целью работы было изучение эффективности комплексного лечения, включающего лазерный юоретаж, у больных с генерализованным агрессивным пародонтитом. В общей сложности 112 соматически здоровых людей в возрасте от 11 до 35 лет были включены в исследование. Метод полимеразной цепной реакции в реальном времени (ПЦР-РВ) использовали для обнаружения пародонтопатогенных бактерий. Настоящее исследование показало, что комплексное лечение приводит к существенному сокращению содержания основных пародонтопатогенов в течение 1 года наблюдения. После первого этапа лечения, идентификация наиболее агрессивных микроорганизмов P.g., T.f. и T.d. в количестве, превышающем 105, снизилась с более чем 60% до 32%, 39% и 34% соответственно. Через 1 месяц после использования диодного лазера частота встречаемости этих бактерий еще больше уменьшилась и составила 9 %, 19 % и 11% соответственно. Медианы содержания анаэробных микроорганизмов снижались с более чем 106 до лечения до 103 через 1 месяц после использования диодного лазера. Достигнутые результаты сохранялись в течение одного года наблюдений при регулярном проведении поддерживающей терапии