Abstract

AQUINO, L.R.C et al. Preparation and characterization of cement-based hydroxyapatite and galactomannan extracted from Adenanthera pavonina L. seeds. Rev. LatinAm. Metal. Mater. [online]. 2017, vol.37, n.1, pp.102-110. ISSN 0255-6952.

The aim of this study was to prepare and characterize a ceramic matrix cement of hydroxyapatite (HAp) and galactomannan (Gal) extracted from Adenanthera pavonina L. seed. Three composites were prepared: the solid phases used were 75 wt% HAp and 25 wt% Gal (HAG) both powder adding to composite 0.30 ml distilled water. The composite HAGJET consists of 0.10 mL catalyst commercial JET® (methyl methacrylate and dimethyl-p-toluidine) and 0.20 mL distilled water (see table 1). The HAGLS composite was composed of 60 wt% HAp powder, liquid phase of 40% Gal solution and 0.10 mL of catalyst commercial LS® (phosphoric acid, zinc oxide, aluminum hydroxide and water) (see table 1). The solid phase in each material was dissolved in the liquid corresponding to each composite formed. The phases of HAp and Gal were characterized by X-ray diffraction. The setting time, flow and solubility were tested according to ISO 6876/2001. Furthermore, the amount of water that each material absorbs was determined, as well as their microhardness and morphology. The data were analyzed using 1-way ANOVA with Student’s t-test (p < 0.05). All of the materials exhibited good setting time and flow above that allowed by the ISO (p < 0.05). The HAGLS composite had solubility of less than 3% (p < 0.05), absorbed less water (p < 0.05) and had the highest hardness value. The HAG and HAGLS composites showed roughened surfaces, while the HAGJET exhibited a smooth surface. These results suggest that there is potential to develop a sealer using HAp and Gal.

Keywords : Ceramic-matrix cement; Cure behaviour; Hydroxyapatite; Galactomannan.

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