Premium
Influence of powder‐to‐water ratio on radiopacity, setting time, pH , calcium ion release and a micro‐ CT volumetric solubility of white mineral trioxide aggregate
Author(s) -
Cavenago B. C.,
Pereira T. C.,
Duarte M. A. H.,
OrdinolaZapata R.,
Marciano M. A.,
Bramante C. M.,
Bernardineli N.
Publication year - 2014
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12120
Subject(s) - radiodensity , ultrapure water , mineral trioxide aggregate , solubility , calcium , materials science , dentistry , distilled water , phosphoric acid , nuclear chemistry , chemistry , mineralogy , chromatography , medicine , metallurgy , radiography , surgery , organic chemistry , nanotechnology
Aim To evaluate the radiopacity, setting time, pH level, calcium ion release and solubility of white mineral trioxide aggregate ( MTA ; A ngelus, L ondrina, P r, B razil) with different powder‐to‐water ratios. Methodology Three MTA groups were prepared using 4 : 1, 3 : 1 and 2 : 1 powder‐to‐water ratios. For the radiopacity analysis, the 10 × 1 mm specimens were arranged on occlusal films with a cylinder of dentine and an aluminium stepwedge. The digitized radiographs were evaluated with D igora 1.51 software to determine the radiographic density. The setting time test was performed according to the A merican S ociety for T esting and M aterials 266/08 standard specifications, but the specimens were made according to I nternational O rganization for S tandardization 6876:2001. Thirty acrylic teeth with root‐end filling material were immersed in ultrapure water for measurement of pH level and calcium ion release (atomic absorption spectrophotometer) at 3, 24, 72 and 168 h. In the solubility test, the root‐end fillings of 30 acrylic teeth were scanned twice by a M icro‐ CT , before and after immersion in ultrapure water for 168 h. Digital data were reconstructed, and the volume (mm 3 ) of the samples was obtained using CT an software (CTan v1.11.10.0, SkyScan). The data were statistically analysed by the anova , T ukey, K ruskal– W allis and D unn's tests. Results The radiopacity was higher ( P < 0.05) when the 4 : 1 proportion was utilized. The setting time was longer, and the pH level and calcium ion release were higher ( P < 0.05) with a greater volume of water. The group with more water (2 : 1) had significantly ( P < 0.05) more material volume loss (6.46%) compared with the other groups. Conclusions The ratio of powder/water significantly interfered with the physical and chemical properties of white MTA A ngelus.