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BioMed Research International
Volume 2014, Article ID 178064, 6 pages
http://dx.doi.org/10.1155/2014/178064
Research Article

Characterization of Morphology and Composition of Inorganic Fillers in Dental Alginates

1Department of Restorative Dentistry, School of Dentistry, University North of Parana (UNOPAR), Rua Marselha 183, 86041-140 Londrina, PR, Brazil
2Department of Prosthodontics and Periodontics, Piracicaba Dental School, State University of Campinas (UNICAMP), Avenida Limeira 901, 13414-903 Piracicaba, SP, Brazil
3Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas (UNICAMP), Avenida Limeira 901, 13414-903 Piracicaba, SP, Brazil

Received 22 February 2014; Revised 27 June 2014; Accepted 14 July 2014; Published 24 July 2014

Academic Editor: Konstantinos Michalakis

Copyright © 2014 Ricardo Danil Guiraldo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Energy dispersive X-ray spectroscopy microanalysis (EDX), scanning electron microscopy (SEM), and Archimedes’ Principle were used to determine the characteristics of inorganic filler particles in five dental alginates, including Cavex ColorChange (C), Hydrogum 5 (H5), Hydrogum (H), Orthoprint (O), and Jeltrate Plus (JP). The different alginate powders (0.5 mg) were fixed on plastic stubs and sputter coated with carbon for EDX analysis, then coated with gold, and observed using SEM. Volume fractions were determined by weighing a sample of each material in water before and after calcining at 450°C for 3 h. The alginate materials were mainly composed of silicon (Si) by weight (C—81.59%, H—79.89%, O—78.87%, H5—77.95%, JP—66.88%, wt). The filler fractions in volume (vt) were as follows: H5—84.85%, JP—74.76%, H—70.03%, O—68.31%, and C—56.10%. The tested materials demonstrated important differences in the inorganic elemental composition, filler fraction, and particle morphology.