Physico-chemical properties of MTA and a novel experimental cement.
OBJECTIVE
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).


METHODS
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.
Santos
A D
AD
Departamentos de Física e Química, UNESP Campus de Olha Solteira, Sao Paulo, Brazil.
Moraes
J C S
JC
Araújo
E B
EB
Yukimitu
K
K
Valério Filho
W V
WV
D017607:Aluminum Compounds / Q000737:chemistry*; D000704:Analysis of Variance; D002118:Calcium / Q000032:analysis; D017610:Calcium Compounds / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D004338:Drug Combinations; D004553:Electric Conductivity; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013054:Spectrophotometry, Atomic
D017607:Aluminum Compounds; D017610:Calcium Compounds; D003738:Dental Cements; D004338:Drug Combinations; D007477:Ions; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C472247:accelerated Portland cement; C086631:mineral trioxide aggregate; D002118:Calcium