ABSTRACT
AIM: To evaluate the release of calcium ions, pH and conductivity of a new experimental dental cement (EC) and to compare them with those of mineral trioxide aggregate (MTA-Angelus). METHODOLOGY: Five samples of each cement were prepared using plastic tubes 1 mm in diameter and 10 mm long. Each sample was sealed in a test tube containing 10 mL deionized water which was analysed after 24, 48, 72, 96, 192, 240 and 360 h for pH, electrical conductivity and calcium release. The concentration of calcium ions was obtained through atomic absorption spectroscopy technique. The data were analysed statistically using the analysis of variance (anova) and the Student's test (t-test). RESULTS: The pH of the storage solutions was not affected by the material and the interaction of material with time (P > 0.05). However, the time of immersion was significant (P < 0.01) for both materials. For the electric conductivity and calcium release, the interaction of material with time was statistically significant (P < 0.01), indicating that EC and MTA-Angelus did not behave in a similar manner. CONCLUSIONS: The experimental cement released calcium and increased the pH of the storage solutions in a similar manner to MTA-Angelus. However, EC showed significantly higher calcium release than commercial MTA-Angelus after 24 h.
Subject(s)
Aluminum Compounds/chemistry , Calcium Compounds/chemistry , Dental Cements/chemistry , Oxides/chemistry , Root Canal Filling Materials/chemistry , Silicates/chemistry , Analysis of Variance , Calcium/analysis , Drug Combinations , Electric Conductivity , Hydrogen-Ion Concentration , Ions , Materials Testing , Spectrophotometry, AtomicABSTRACT
Foram medidos os diâmetros bi-ilíaco superior (dorsal), bi-ilíaco inferior (ventral) e vertical da pelve em 273 fêmeas de bovinos da raça Guzerá (Bos indicus), bem como testadas suas eventuais correlaçöes com a idade, altura, comprimento, perímetro torácico e peso do animal. As avaliaçöes foram feitas in vivo com o auxílio do aparelho preconizado por MENISSIER; VISSAC5 (1971). No cômputo geral foram obtidas as seguintes médias: diâmetro bi-ilíaco superior, 14,55 cm; diâmetro bi-ilíaco inferior, 13,39 cm e diâmetro vertical, 18,60 cm; tendo o teste de correlaçäo entre o valor dos diâmetros e outras mensuraçöes bem como a variaçäo dos diâmetros bi-ilíacos, superior e inferior, indicado interdependência
