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In order to analyze biomineralized microscopic structures on the microscopic level, they must be previously subjected to histological in vitro demineralization process, which removes the inorganic component. The speed of demineralization and the influence on the preservation of tissue morphology are the two most important parameters for the choice of decalcifying solution. The solution of Na2-EDTA (ethylenediaminetetraacetic acid – disodium salt), madein different concentrations, is considered to bethe slowest, but alsothe most reliable in means of demineralization. The aim of the study was to investigate the possible acceleration of tooth samples demineralization with alkalinized solution of Na2-EDTA,using different conditions of agitation, as well as periodic renewal of the solution for demineralization. Twelve wisdom teeth were used for the purposes of research, extracted for orthodontic reasons. The process of demineralization was performed in the 18.6% aqueous solution of Na2-EDTA. During 45 days, the decline of the specimen’sweight was measured for three physical conditions: the irradiation of the tooth halves samples in the demineralizing agent with the microwaves was used as an agitating technique, 24-hour stirring of the demineralizing agent with the tooth samples on the magnetic stirrer was applied, and the demineralization of the material on the room temperature. Each of these conditions was further subdivided into two groups: in one the demineralizing agent was constant during 45 days of the experiment, and in the second the demineralizing agent was replaced by the same volume of new solution every three days. Demineralized samples were routinely processed to microscopic slides, stained with hematoxylin and eosin. The preservation of dental structures up to cytological details of different cell types in dental pulp was evidenced on microscopic slides. Demineralization of teeth with alkalinized solution of Na2-EDTA runs independently of examined types of agitation and/or renewal of chelating solution. It is possible to make a significant laboratory rationalization for in vitro tissue demineralization by excluding physical agitation, and frequent renewal of demineralizing solution.

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Acute leukemia is a malignant disease of hematopoietic tissue, characterized by clonal proliferation and accumulation of abnormal leukemia cells in the bone marrow and by insufficient hematopoiesis. Clinical picture is characterized by the appearance of symptoms and signs arising from the insufficiency of norm.al hematopoiesis, the infiltration of tissues and organs by malignant cells and the metabolic disorders. Due to the insufficient hematopoiesis, three clinical syndromes are present: anemias, bleedings and infections. Acute leukemias occur in the conditions of perfect health and they develop very rapidly. If not treated, they have the lethal outcome in a few months at the latest. The treatment is based on modern poly-chemotherapeutic protocols, which are different for each leukemia subtype. Stomatological examination may reveal gum bleedings and infiltrations, which are among the first oral manifestations of acute leukemia. Indications may also be found for oral mucositis, which can be manifested only by erythema, or progress into ulcerations in more severe cases. Adequate oral cavity care procedure represents an obligatory and extremely important part of treating acute leukemias and it can be administered exclusively by the best-trained medical staff. There is a great number of various oral manifestations of acute leukemias, significantly impacting the quality of life of these patients, as well as the total therapeutic success in treating acute leukemias. [ABSTRACT FROM AUTHOR]