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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Cavenago, B. C. [1] ; Pereira, T. C. [1] ; Duarte, M. A. H. [1] ; Ordinola-Zapata, R. [1] ; Marciano, M. A. [1] ; Bramante, C. M. [1] ; Bernardineli, N. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: International Endodontic Journal; v. 47, n. 2, p. 120-126, FEB 2014.
Web of Science Citations: 30
Abstract

AimTo evaluate the radiopacity, setting time, pH level, calcium ion release and solubility of white mineral trioxide aggregate (MTA; Angelus, Londrina, Pr, Brazil) with different powder-to-water ratios. MethodologyThree MTA groups were prepared using 4:1, 3:1 and 2:1 powder-to-water ratios. For the radiopacity analysis, the 10x1mm specimens were arranged on occlusal films with a cylinder of dentine and an aluminium stepwedge. The digitized radiographs were evaluated with Digora 1.51 software to determine the radiographic density. The setting time test was performed according to the American Society for Testing and Materials 266/08 standard specifications, but the specimens were made according to International Organization for Standardization 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 168h. In the solubility test, the root-end fillings of 30 acrylic teeth were scanned twice by a Micro-CT, before and after immersion in ultrapure water for 168h. Digital data were reconstructed, and the volume (mm(3)) of the samples was obtained using CTan software (CTan v1.11.10.0, SkyScan). The data were statistically analysed by the anova, Tukey, Kruskal-Wallis and Dunn's tests. ResultsThe 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. ConclusionsThe ratio of powder/water significantly interfered with the physical and chemical properties of white MTA Angelus. (AU)

FAPESP's process: 11/18272-1 - The effect of using phytotherapics and propolis in physicochemical properties, antimicrobial and biocompatibility of MTA
Grantee:Bruno Cavalini Cavenago
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 10/16072-2 - Microtomograph (MicroCT) at the anatomy and procedures endodontics study
Grantee:Clovis Monteiro Bramante
Support Opportunities: Regular Research Grants