Abstract

LOZANO, KAREN et al. INFLUENCE OF ALKALINE CO-MONOMER AND HYDROXYAPATITE ON THE PROPERTIES OF ACRYLIC BONE CEMENTS. Dyna rev.fac.nac.minas [online]. 2013, vol.80, n.181, pp.153-162. ISSN 0012-7353.

Acrylic bone cements with a solid/liquid 2/1 ratio were formulated. Methyl methacrylate (MMA) was the liquid monomer and 2.5% dimethyl-p-toluidine was the accelerator. The solid component included poly(methylmethacrylate) as load, PMMA, Barium sulfate as radio opaque agent, and 2% benzoyl peroxide as initiator. Finally, hydroxyapatite as bioactive load, and dimethyl amino ethyl methacrylate (DMAEM) as alkaline co-monomer, were incorporated into the material in different percentages (0-20% w/w for the first one and 0-10% for the latter). As expected, the samples prepared from the above formulations presented high reaction temperatures (>80ºC) and high resistance to compression (124.0 MPa) above those specified by ISO 5833 standard. An increase in the percent of hydroxiapatite and alkaline co-monomer lead to low polymerization temperatures, low modules and low mechanical resistance, as well as a deposition of a dense layer similar to biological apatite on the surface of the material after being dipped in a simulated biological fluid for 30 days.

Keywords : Bone cements; bone regeneration; alkaline co-monomers; hydroxyapatite; in vitro tests.

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