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Biomedical subjects

A I Volozhin

Publications and source records attributed to A I Volozhin.

At least 19 recordsLinked to original sources
PubMed2006

[Histamine-releasing activity of dental materials employed as root canal filling].

Four samples of dental materials (DM) estd for root canal filling, Septodent (S), Zinkoxide (Z), Foredent (F) and Cialite Regular (CR), were studied for their ability in vitro to release histamine (HR) employing the computerized fiber glass based histamine release assay using whole blood from allergic patients and healthy donors. It was found that F induced high and S low levels of HR from blood basophils from both allergic and non-allergic subjects. Z and CR did not induce HR from blood basophils similar to the negative control. The HR assay may be a useful method for preliminary investigation of DM employed for root canal fillings for safety as well as for selection of specific DM for individual patients.

Basophils↗
PubMed2006

[Hypoxic training -- effective method of raising skin vitality in cases of local plastic operations].

In spite of the complications after expander use the advantages of local plastics predetermine constant return to the method. Systemic use of hypoxic training produces stimulating effect on the skin microcirculation and can be used widely in clinical surgical practice in cases of local plastic operations to prevent possible complications reducing consequences of blood supply disturbance and tissue oxygen provision. The method of hypoxic adaptation let us receive as non-medicamentous mean to prepare for shorter period of time more vital flap.

Adaptation, Physiological↗
PubMed2005

[Immunologic disorders in pathogenesis of chronic generalized parodontitis].

Systemic immunity was studied in patients with chronic generalized parodontitis. This group of patients had distinct changes in immunologic system: depression of T- and stimulation of B-cellular immunity without accumulation of plasma cells and initiation of effective humoral response. Increased peripheral blood number of lymphocytes expressing induction of apoptosis CD95 receptors and ligand for this receptor CD95L (Fas-L) can lead to intensification of lymphocyte apoptosis and may be the reason for T-cell deficit development. The results of the study confirm the important role of immune system disturbances in pathogenesis of chronic generalized parodontitis.

Apoptosis↗
PubMed2004

Laser stereolithography and supercritical fluid processing for custom-designed implant fabrication.

This paper describes the laser photopolymerization of a liquid mixture of polyfunctional acrylic monomers, photoinitiator and hydroxyapatite (HA). Pure polymeric and composite materials of specific shape and structure were fabricated by laser stereolithography based on images derived from three-dimensional (3D) computer modeling. The polymeric objects then were treated with supercritical carbon dioxide to remove potentially toxic residues (monomers, low molecular weight oligomers, etc.) and to provide interconnective microporosity. Finally, samples were implanted into white rats (diastolic epiphysis of femoral bone) to study living tissue response and processes of osteointegration and osteoinduction. It was shown that incorporation of HA into the composite implant structure encouraged periosteal as well as endosteal osteogenesis and improved their osteointegrative characteristics in particular. Supercritical carbon dioxide treatment significantly enhanced the biocompatibility of the materials, increasing the area of direct contact of the implant surface with regenerated bone tissue.

Animals↗
PubMed2004

[Development and use of periodontal dressing of collagen and Lactobacillus casei 37 cell suspension in combined treatment of periodontal disease of inflammatory origin (a microbiological study)].

Periodontal dressing consisting of collagen and Lactobacillus casei 37 cell suspension (cell concentration 108 cells/ml) was created and used in combined treatment of patients with chronic generalized parodontitis. Efficacy of the developed isolation was explained by a considerable decrease of the number and frequency of isolation of aggressive microbial representatives (pigment synthesizing Bacteroids, Actinomyces and Str. intermedius) in periodontal pockets and also Fungus (Candida albicans). This periodontal dressing provided remission up to 10-12 months.

Chronic Disease↗
PubMed2003

[Mechanisms disordering wound healing on the lip after bilateral crossing of the inferior alveolar nerve and experimental validation of correction methods].

The mechanisms of lip wound healing after bilateral crossing of the inferior alveolar nerve (IAN) were studied on Chinchilla rabbits in 3 experimental series, 6 animals per series. In group 1 bilateral crossing of IAN was carried out, in group 2 bilateral crossing of IAN was paralleled by removal of a mucous flap in the middle of the lower lip, and in group 3 the same wound as in group 2 was created, after which the wounds in this group were daily treated with a special ointment and a single injection of lidocaine (1% solution) under the wound. The nerve crossing led to development of ulcer on the lip with degenerative changes in the vascular walls, destruction of nerve fibers, and fragmentation of some axial cylinders. Crossing of IAN simultaneously with removal of the lower lip flap led to more severe degenerative changes in the tissue. Daily treatment of the lip with the ointment and lidocaine blocking normalized wound healing. A possible mechanism of the changes observed is discussed.

Anesthetics, Local↗
PubMed2003

[Evolution of tissue structures in the mandible after implantation of plate from polymethylmethacrylate and its compositions with hydroxyapatite].

Tissue reactions to active modified composite material were studied in experiments on Chinchilla rabbits. In the first series of experiments plates from composite material were implanted: polymethylmethacrylate (PMMA) plates were used in group 1, PMMA composition with hydroxyapatite (HAP) in group 2, and PMMA composition with HAP modified by polyacrylic acid in group 3. The content of HAP in each group was 30% by weight. Implantation of plates from pure PMMA induced atrophic processes with formation of connective tissue capsule at the site of implantation. In the second series of experiments the manifestations of inflammatory reactions in the bone and adjacent tissues, caused by HAP release into tissue, were observed, which were paralleled by activation of bone formation, which sometimes acquired the pattern of a hyperproductive reaction. PMMA/HAP composite modified by chemical bond proved to be the most effective: its implantation caused no manifest pathological reactions and inflammatory infiltration; no intraosseous deposition of crystals were detected. Intensive osteogenesis round the implanted plate was observed.

Animals↗
PubMed2003

[Use of chromato-mass-spectrometry for the differential diagnosis of suppurative and nonsuppurative inflammations in the maxillofacial area in children].

Ten children with inflammatory processes in the maxillofacial soft tissues and 10 healthy children were examined using chromato-mass-spectrometry of the chemical composition of oral cavity air. Air samples were collected by an adsorbent sample collector by individual sucking and analyzed on a Finnigan MAT chromato-mass-spectrometer. The concentrations of short-chain fatty acids and minor ketones were increased and normally absent isobutyl alcohol appeared in the oral cavity air in patients with serous inflammations. The content of valeraldehyde, isoprene, sulfur compounds increased significantly in suppurative inflammations; ramified long-chain aldehydes, absent in serous inflammation, appeared. The ratios of the following substance concentrations were estimated: acetaldehyde/valeraldehyde, pentane/dimethylsulfide, undecane/dimethylsulfide, which can be used for the differential diagnosis of suppurative and nonsuppurative inflammations of the maxillofacial soft tissues in children.

Cellulitis↗
PubMed2003

[Mathematical simulation and estimation of stress deformed status of a maxillodental segment after tooth depulpation].

Mathematical simulation, estimation, and evaluation of stress-deformed status of bone tissue under the roots of functionally loaded mandibular abutment teeth after their depulpation were carried out. The resultant mathematical model, realized in the SPLEN-K system, is the key stage in the development and subsequent clinical application of automated diagnosis and consultation complex for patients with dentition defects.

Computer Simulation↗
PubMed2003

[Histamine-releasing activity of acrylic plastic materials].

The histamine-releasing activity of acrylic plastics (ftorax, stomacryl, ethacryl) used for denture making and maxillofacial prostheses was studied by automated and computer-aided fiber glass method for evaluating histamine release from whole blood basophils. The results indicate that some plastics made by the thermo-polymerization method (for example, ethacryl) are characterized by higher histamine-releasing activity than the plastics made by polymerization using superhigh frequency electromagnetic energy. The method is recommended for preliminary screening of new polymers intended for dentistry and for individual selection of materials with consideration for their safety and strength characteristics.

Acrylic Resins↗
PubMed2002

[Study of the characteristics of biological membranes used in osteoplasty with the aim of purposeful tissue regeneration on a model of continuous bone marrow cultures].

The biological materials Parodoncol and Hapcol (Polystom Firm) used in osteoplasty were studied in continuous mouse bone marrow cultures. Culturing in continuous bone marrow cultures showed growth and development of stromal and hemopoietic cells on Hapcol and Parodoncol. The materials caused no negative reactions and failed to inhibit bone marrow cell growth. The number of cells gradually increased, hemopoiesis was normal, and young and mature granulocytes formed. This method of culturing proved to be highly effective for evaluation of the characteristics of biological membranes and other composite materials.

Animals↗
PubMed2001

Interaction peculiarities between microbial cenosis and local immunity of periodontium of humans under extreme conditions.

The investigations were directed at finding out the peculiarities of both periodontal microflora and local immunity under extreme conditions (spaceflight, saturation diving, antiorthostatic hypokinesia). The obtained results revealed different kinds of interactions amongst which saturation diving resulted in the most severe decrease of commensale microflora level, decrease of local immunity and appearance of periodontal pathogens.

Adolescent↗