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1.
Stomatologiia (Mosk) ; 100(3): 13-18, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34180619

RESUMO

OBJECTIVE: To study the effect of the occlusal surface of a natural tooth, cement-retained and screw-retained fixed partial dentures supported by dental implants and the coefficient of friction on the stress distribution in the peri-implant bone at maximum and minimum principal stresses. MATERIAL AND METHODS: Study of maximum and minimum principal stresses in models with natural teeth and artificial crowns supported by dental implants, taking into account the coefficient of friction using the finite element analysis. RESULTS: In models represented by fixed partial dentures supported by dental implants and a natural tooth, the maximum tensile stresses arise in the cortical bone in the cervical region of the artificial crown, and the maximum compressive stresses occur both in the cortical layer in the cervical region of the artificial crown and in the cervical region of the tooth. In models with two fixed partial dentures supported by dental implants or two natural teeth, the stress distributions in the cortical layers in the upper and lower jaw are almost identical. CONCLUSION: Modeling the antagonist and adding to the FEA model is important in order to determine the precise and realistic direction of the resulting force vector. Amplification of the number of contact areas should be considered when modeling the occlusal surface of artificial crowns supported by dental implants.


Assuntos
Implantes Dentários , Boca Edêntula , Coroas , Prótese Dentária Fixada por Implante , Análise do Estresse Dentário , Prótese Parcial Fixa , Análise de Elementos Finitos , Humanos , Estresse Mecânico
3.
Med Tekh ; (6): 26-31, 1982.
Artigo em Russo | MEDLINE | ID: mdl-7154877

RESUMO

The statistical method for estimating the stability of transient bioelectric signals is analysed. Modal values of bar charts computed by sliding sample of pulse counts are proposed to serve as a stability index. The destabilization index is also derived. It serves as a current estimate of the biological object status in response to external exposures. A noise immunity of the method for a noisy pulse model is computed. Some results of clinical testing of the method as applied to the task of the current estimate of fetus conditions on the basis of rhythmographic data are presented.


Assuntos
Análise de Sistemas , Circulação Sanguínea , Feminino , Monitorização Fetal , Humanos , Teoria da Informação , Modelos Biológicos , Gravidez , Processos Estocásticos , Contração Uterina
4.
Med Tekh ; (6): 28-31, 1980.
Artigo em Russo | MEDLINE | ID: mdl-7442501

RESUMO

The article describes monitoring systems for following critically-ill patients, and cardio-resuscitation complex, apparatus for defibrillation, and short-term anaesthesy, cardiostimulators. All these units have been elaborated and serially produced by the Radioelectronic Medical Equipment Association. Their importance and place in providing the patients treatment and diagnosis in resuscitation and intensive care departments of the cardiological service are shown.


Assuntos
Institutos de Cardiologia , Cardiologia/instrumentação , Hospitais Especializados , Unidades de Terapia Intensiva , Ressuscitação/instrumentação , Monitorização Fisiológica/instrumentação , U.R.S.S.
5.
Med Tekh ; (2): 35-7, 1980.
Artigo em Russo | MEDLINE | ID: mdl-7392874

RESUMO

A device is offered, which operation is based on the discrete supply of liquid to the tissue with recording every new portion by a photographic sensitive element. This device is superior over the known units, because of its higher accuracy while obtaining information, and possibility to investigate the time course of absorption.


Assuntos
Ciência de Laboratório Médico/instrumentação , Cloreto de Sódio , Absorção , Animais , Edema/metabolismo , Feminino , Hemorragia/metabolismo , Humanos , Soluções Isotônicas , Músculos/metabolismo , Ratos , Absorção Cutânea , Fatores de Tempo
6.
Resuscitation ; 8(1): 53-67, 1980 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-7444211

RESUMO

The effectiveness and safety of the defibrillating effect of a bipolar impulse produced by a Soviet DK1-01 defibrillator and the Monopolar impulse Ed-Mark have been tested in 14 experiments on the anaesthetized dogs. A quantitative criterion to compare the safety of different defibrillators and an electro-therapeutic index of the defibrillating action are being suggested. It is defined as the ratio of the thresholds of energy in joules causing lesions to that causing defibrillation. In the above experiments the mean value of this therapeutic index was 1.59 +/- 1.41 for the Ed-Mark impulse and 4.32 +/- 2.78 for the defibrillator DK1-01 impulse. The difference of the mean values was statistically significant (P = 0.02).


Assuntos
Cardioversão Elétrica/métodos , Exposição Ambiental , Concentração Máxima Permitida , Animais , Cães , Feminino , Masculino
7.
Med Tekh ; (2): 22-4, 1979.
Artigo em Russo | MEDLINE | ID: mdl-431358

RESUMO

To increase the operation speed of devices recording the R--R intervals on electrocardiograms, the authors performed a theoretical analysis of the differential-statistical method used for signal transformation, and elaborated a special block for p4-ch-0l electronic polygraph. Clinical trials confirmed the theoretical and experimental results and indicated that the new block based on the differential-statistical signal transformation allows, by means of recorders, to register the rhythmograms at a high resolution and without distortions.


Assuntos
Eletrocardiografia/instrumentação , Frequência Cardíaca , Humanos , Matemática
8.
Med Tekh ; (5): 52-5, 1977.
Artigo em Russo | MEDLINE | ID: mdl-593097

RESUMO

To exercise control over the condition of critically ill patients a monitoring unit DKC4T-01 which permits it to measure the cardio- and hemodynamic parameters is recommended. The monitoring unit signals "alarm" when the pertinent indicators deviate from the permissible values. The block-wise design of the unit allows also the separate use of individual instruments and devices of this complex setup.


Assuntos
Monitorização Fisiológica/instrumentação , Cuidados Críticos/métodos , Eletrocardiografia/instrumentação , Eletrônica Médica/instrumentação , Humanos , U.R.S.S.
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