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Biomedical subjects

A I Matveeva

Publications and source records attributed to A I Matveeva.

At least 19 recordsLinked to original sources
PubMed2002

[Results and perspectives of development in dental implantation in Russia].

The basic trends of scientific research carried out at the implantation department of CRID (Central Research Institute of Dentistry), referred to the fundamental problems in medicine and biology including a variety of not only experiments and clinical study but also a complex of technical aspects. Our long-term research and valuable clinical material collected resulted in confirming the necessity and importance of complex approaches developed by the Institute in dental implantation.

Academies and Institutes↗
PubMed2002

[Planning of orthodontic treatment in patients with maxillary dentition defects using mathematical methods].

Stress-deformed status of bone tissue in the implantation zone was studied. The relationship between the level of strain in the spongy and cortical layers of the bone and spatial location of the implant in the jaw and its geometrical parameters is demonstrated. Numerical analysis of the level of bone tissue stress was carried out on the basis of experimentally created three-dimensional solid-body model of the maxilla. The process of changes in the distribution of tensions during different phases of mastication was investigated. The potentialities of numerical analysis in the planning of orthodontic treatment of patients with dentition defects making use of implants are demonstrated.

Dental Implantation, Endosseous↗
PubMed1999

[The use of the Periotest method for the clinical assessment of the efficacy of dental implantation].

The paper describes a modern diagnostic method: Periotest for assessing the stability of intraosseous implants. The mobility of implants after remote and immediate implantation is assessed in 65 patients with dentition defects. The study yielded complete information on the status of tissue complex, detected the early signs of impaired bone integration after implantation, and helped more reliably predict the results.

Dental Implantation, Endosseous↗
PubMed1998

[A biomechanical study of dental implants using a method for 3-dimensional volumetric mathematical modelling].

Biomechanics of the dental implants introduced into alveoli immediately after tooth extraction has been investigated. The programme ANSYS has been used. Three-dimension volume mathematical models were calculated, with the help of which the tense-deformed state of the supportive biological tissues has been investigated in the area of direct implantation. On the grounds of the results obtained a conclusion has been made that there is an essential improvement of the load distribution under investigation of the inner bone modified biologically designed implants for direct implantation.

Alveolar Process↗
PubMed1998

[The features of using intraosseous implants with intramobile elements].

Functional features of type Brånemark implants are compared with those of type IMZ implants. The problem of determining optimal stiffness characteristics of type IMZ implants has been solved by means of linear programming. The conclusion was made on considerable improvement in distribution of loads when type IMZ osseointegrated implants are used as supporting elements in the denture.

Bite Force↗
PubMed1997

[The enhancement of the efficacy of patient orthodontic treatment based on the mathematical modelling of prospective implant designs].

Opportunities to increase prosthetic treatment efficiency by means of applying osseointegrated implants of traditional and prospective types are analysed. A technique of mathematical modelling of the interaction between implants and jaw bone is exposed. The numerical model and applied program, developed on the basis of finite element method, enabling to analyse a stress strain state of the bone and to determine extreme safe loads on implants are described. It is shown, that the most loaded zone is a layer of the compact bone directly contiguous to the neck of the implant. That is in good agreement with the results of clinical research, according to which just this zone has the highest percentage of complications. Methods for further optimisation of implants and prosthetic structures for the purpose to perfect the techniques of prosthetic treatment are discussed.

Computer Simulation↗
PubMed1996

[Load tests in silent myocardial ischemia and latent heart failure in patients with IHD and intermittent claudication].

244 patients with ischemia of the lower limbs were treated surgically in the specialized cardiovascular center. No lethal outcomes were reported because previously derived algorithm of detecting silent myocardial ischemia in patients with intermittent claudication and load tests (bicycle ergometry and drug stress tests) had allowed the surgeons to ascertain the extent of coronary damage and detect subclinical cardiac failure. Valid assessment of cardiac factors enabled the right choice between surgical and therapeutic methods and staging of the procedures.

Arteriosclerosis↗
PubMed1996

[The clinical assessment of the efficacy of using a biogenic composite material in dental implantology].

A new biogenic composite material based on hydroxyapatite and collagen with silamine was effectively used in dental implantology. Use of this material was conductive to a better course of the implant integration in the adjacent tissue structures and prevented the development of resorptive and atrophic changes in the alveolar process. Use of composite material in patients with relative indications for implantation precluded the development of complications in the early postoperative period and in remote periods of the follow-up.

Adult↗
PubMed1990

[Diagnostic possibilities of precordial electrocardiographic mapping in the assessment of the results of dipyridamole test in patients with ischemic heart disease].

The dynamics of cross-sectional, isochronic, and integral maps of electric potential distribution during the dipyridamole test was examined in 35 patients with verified coronary heart disease and 12 control patients. Basic differences were found in changes of excitation propagation velocities and positive potential amplitude in the groups examined. A local increase in R wave areas on the maps of positive potential differences was found to be the most significant mapping sign of transient myocardial ischemia (the sensitivity, specificity, and diagnostic accuracy being more than 97%). The diagnostic accuracy of an absolute or relative increase in the integral time and amplitude parameters of the mapping was 77% and 70%, respectively.

Adult↗
PubMed1983

[Changes in the renin-aldosterone system after unilateral portalization of adrenal and renal blood in patients with arterial hypertension].

Twenty-one patients with severe arterial hypertension were operated on using an original procedure, which consisted in creating a left-side renoportal venous anastomosis and right-side adrenalectomy. A considerable hypotensive effect was noted at both early and late follow-up. A drop in vascular peripheral resistance as a result of decreased blood aldosterone and cortisol levels as well as sodium elimination was found to be the principal mechanism of the hypotensive effect.

Adrenal Glands↗