Сравнительная клиническая оценка качества ортопедического лечения моляров CAD/CAM коронками методикой chairside

The aim of the research was a comparative clinical evaluation of the results of prosthetic treatment with chairside CAD/CAM crowns for molars made from hybrid ceramics VITA Enamic, blocks of feldspatic ceramics VITABlocs Mark II, blocks of leucite glass IPS Empress CAD. Material and methods. The study involved 30 patients aged from 19 to 60 years old with defects in hard tissues of molars. For clinical evaluation we used «Clinical criteria for evaluation of direct and indirect restorations» developed by FDI in 2007, which included the assessment of several aesthetic, functional and biological parameters. We also included 2 additional criteria indicators: the condition of the antagonist tooth and the hygienic condition of the prosthesis in comparison with the hygiene of natural teeth. All patients were randomized into 3 groups of 10 people. After the treatment the clinical quality assessment was carried out in the following time intervals: 30 minutes, 1, 6, 12, 18, 24 months after the fixation of the crown. Results. Clinical evaluation of the results of prosthetic treatment of 30 patients with chairside CAD/CAM crowns made from three different materials did not reveal any significant difference in the clinical criteria for evaluation of direct and indirect restorations within 24 months.Цель исследования - сравнительная клиническая оценка результатов ортопедического лечения больных с дефектами твердых тканей моляров chairside CAD/CAM коронками из различных материалов. Материал и методы. В исследовании участвовали 30 пациентов в возрасте от 19 до 60 лет (18 мужчин, 12 женщин) с дефектами твердых тканей моляров. Для исследования были отобраны блоки из гибридной керамики VITA Enamic, блоки из полевошпатной керамики VITABlocs Mark II, блоки из лейцитной стеклокерамики IPS Empress CAD, так как данные материалы имеют разрешение к применению на территории РФ. Для клинической оценки качества ортопедического лечения мы использовали «Клинические критерии оценки прямых и непрямых реставраций», разработанные FDI в 2007 г., которые включали оценку нескольких эстетических, функциональных и биологических параметров. Мы также включили 2 дополнительных критериальных показателя: состояние зуба-антагониста и гигиеническое состояние протеза в сравнении с гигиеной естественных зубов. Все пациенты были рандомизированы на 3 группы по 10 человек. После лечения клиническая оценка качества проводилась в следующие временные интервалы: через 30 мин, 1, 6, 12, 18 и 24 мес после фиксации коронки. Результаты. Клиническая оценка результатов ортопедического лечения 30 пациентов chairside CAD/CAM коронками на моляры верхней и нижней челюстей, изготовленными из трех различных керамических материалов, не выявила существенных различий по «Клиническим критериям оценки прямых и непрямых реставраций» в течение 24 мес

Comparative clinical evaluation of the prosthetic treatment quality of molars restored by chairside manufactured CAD/CAM crowns [Sravnitel'naia klinicheskaia otsenka kachestva ortopedicheskogo lecheniia moliarov CAD/CAM koronkami metodikoĭ chairside]

AIM: A comparative clinical evaluation of the results of prosthetic treatment with chairside CAD/CAM crowns for molars made from hybrid ceramics VITA Enamic, blocks of feldspatic ceramics VITABlocs Mark II, blocks of leucite glass IPS Empress CAD. MATERIAL AND METHODS: The study involved 30 patients aged from 19 to 60 years old with defects in hard tissues of molars. For clinical evaluation we used 'Clinical criteria for evaluation of direct and indirect restorations' developed by FDI in 2007, which included the assessment of several aesthetic, functional and biological parameters. We also included 2 additional criteria indicators: the condition of the antagonist tooth and the hygienic condition of the prosthesis in comparison with the hygiene of natural teeth. All patients were randomized into 3 groups of 10 people. After the treatment the clinical quality assessment was carried out in the following time intervals: 30 minutes, 1, 6, 12, 18, 24 months after the fixation of the crown. RESULTS: Clinical evaluation of the results of prosthetic treatment of 30 patients with chairside CAD/CAM crowns made from three different materials did not reveal any significant difference in the clinical criteria for evaluation of direct and indirect restorations within 24 months.Цель исследования - сравнительная клиническая оценка результатов ортопедического лечения больных с дефектами твердых тканей моляров chairside CAD/CAM коронками из различных материалов. Материал и методы. В исследовании участвовали 30 пациентов в возрасте от 19 до 60 лет (18 мужчин, 12 женщин) с дефектами твердых тканей моляров. Для исследования были отобраны блоки из гибридной керамики VITA Enamic, блоки из полевошпатной керамики VITABlocs Mark II, блоки из лейцитной стеклокерамики IPS Empress CAD, так как данные материалы имеют разрешение к применению на территории РФ. Для клинической оценки качества ортопедического лечения мы использовали 'Клинические критерии оценки прямых и непрямых реставраций', разработанные FDI в 2007 г., которые включали оценку нескольких эстетических, функциональных и биологических параметров. Мы также включили 2 дополнительных критериальных показателя: состояние зуба-антагониста и гигиеническое состояние протеза в сравнении с гигиеной естественных зубов. Все пациенты были рандомизированы на 3 группы по 10 человек. После лечения клиническая оценка качества проводилась в следующие временные интервалы: через 30 мин, 1, 6, 12, 18 и 24 мес после фиксации коронки. Результаты. Клиническая оценка результатов ортопедического лечения 30 пациентов chairside CAD/CAM коронками на моляры верхней и нижней челюстей, изготовленными из трех различных керамических материалов, не выявила существенных различий по 'Клиническим критериям оценки прямых и непрямых реставраций' в течение 24 мес

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Determination of the spacecraft Aist attitude motion on measurements of the Earth magnetic field

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Determining the small spacecraft Aist-2D attitude motion by measurements of the equipment KMU-1

Abstract: The paper presents the results of reconstruction of the spacecraft Aist-2D attitude motion in summer 2016. The reconstruction is based on processing the measurements of two vectors: the spacecraft angular rate and the strength of the Earth magnetic field. The processing technique uses kinematical equations of the attitude motion of a rigid body. In its framework, the measurement data of both types, collected on a time interval, are processed jointly. The angular rate data are interpolated by piecewise linear functions and those functions are substituted in kinematical equations for components of the quaternion, which defines a transformation of the spacecraft coupled coordinate system to the inertial one. The equations obtained present the kinematical model of a spacecraft attitude motion. The solution of the equations, which approximates the real motion, is found by the least squares method from the condition of the best agreement between measured and calculated data of the magnetic strength. The technique allows reconstructing the attitude motion on time intervals more than 10 hours.Note: Research direction:Theoretical and applied problems of mechanic