![]() The use of this substance was reinforced because of its ionic dissociation into calcium and hydroxyl ions and the effect of these ions on tissues and microorganisms 10,14.Ĭalcium hydroxide comes in the form of a white mass that transforms into oxides under heating. ![]() Thus, from the chemical standpoint, calcium hydroxide is a base also known as an ionic compound, composed of a metal cation and a hydroxide anion. This drug is therefore the one most widely employed today as an intracanal medication, which, according to the literature, has withstood the tests of both research and time 3,9. Thus, among the substances that have been proposed for the direct coating of dental pulp, calcium hydroxide is undoubtedly the most effective. However, in 1940, it was Rohner 15 who presented the first histological work on human teeth that demonstrated the formation of a mineralized barrier at the root apex after pulpotomy and dressing of the root canals with Calxyl 12. Pure calcium hydroxide was introduced in dentistry by Hermann in 1920, aiming to find a remedy that offered the advantages of a strong antiseptic for the biological treatment of the pulp and for root canal dressings without the attending inconveniences. Keywords: calcium hidroxide, ph evaluation, dioxide carbon.Ĭonservative and radical endodontic treatments use calcium hydroxide as a therapeutic support due to its action as a bactericide and inducer of mineralized tissue. However, the high alkaline pH of the calcium hydroxide powder was preserved in the absence of CO 2, maintaining its reparative and antimicrobial properties. The results demonstrated that in the presence of CO 2, calcium hydroxide showed a marked loss of and in relation to the decrease in pH. The indices of pOH, and were obtained by mathematical calculations after determining the pH. 0.12g of calcium hydroxide powder was used for each of 16 aliquots diluted in 100 mL of deionized water and distributed in 2 samples of 8 aliquots. This work involved an evaluation of calcium hydroxide powder in the absence and presence of CO 2. Simões, BR 104, Km 97, Tabuleiro dos Martins 57072-970 Maceió - AL, Brazil IIILaboratório de Dentística e Endodontia, Faculdade de Odontologia da Universidade Federal Alagoas FOUFAL, Centro de Ciências da Saúde (CSAU),Campus A. Simões, BR 104, km 97, Tabuleiro dos Martins 57072-970 Maceió - AL, Brazil IILaboratório de Química Analítica, Universidade Federal de Alagoas, Centro de Ciências Exatas e Naturais (CCEN), Campus A. ILaboratório de química de produtos naturais LPqRN, Universidade Federal de Alagoas, Instituto de Química e Biotecnologia (IQB), Cidade Universitária, Br 101, Km 14 Norte, Tabuleiro dos Martins 57072-970 Maceió - AL, Brazil Adjusted ionized calcium may therefore also be a logical choice for establishing agreement between laboratories for reference intervals in healthy adults.Comparative evaluation of the pH of calcium hydroxide powder in contact with carbon dioxide (CO 2)Īmaro de Mendonça Cavalcante I,III, * Jose Carlos de Souza Lima II Lucineide de Melo Santos III Paulo César Costa de Oliveira II Karlos Antonio Lisboa Ribeiro Júnior I Antonio Euzébio Goulart Sant'ana I ![]() Thus we find adjusted ionized calcium to be as useful as actual ionized calcium for evaluation of patients with such disorders. ![]() Consistent agreement between adjusted and ionized calcium was observed in 96.7% of patients representing a variety of the most frequently encountered disorders of calcium metabolism. Results were similar within each diagnostic group. The correlation and the equation for the linear regression between adjusted ionized calcium (y) and actual ionized calcium (x) were y = 1.011x + 0.005 mmol/L, r = 0.992, Sy,x = 0.021 mmol/L. We report results for adjusted ionized calcium (at pH 7.4) and actual ionized calcium (at actual pH) in capillary blood from 183 patients with disorders of calcium metabolism (primary hyperparathyroidism, secondary hyperparathyroidism of malabsorption, primary hypoparathyroidism, Paget's disease, acromegaly, hypercalcemia of malignancy, osteoporosis, sarcoidosis, idiopathic hypercalciuria, and familial hypocalciuric hypercalcemia). ![]()
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