Development and characterization mechanics of composites hydroxyapatite-zirconia, hydroxyapatite-alumina and hydroxyapatite-titania for biomedical ends

Author(s)

Viviane Silva Gomide

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica
• Defense date: 2005-02-25

Examining board members

Cecília Amélia de Carvalho Zavaglia; Celia Marina de Alvarenga Freire; Carlos Alberto Fortulan

• Advisor: Cecília Amélia de Carvalho Zavaglia

Abstract

There is a growing demand of materiaIs that make the remodeling and reconstruction of bone parts possible. Reconstruction of defects of the skulI after trauma, tumor or infection is indicated for aesthetic reasons and for protection of internal structures. Different materiaIs have been used for this purpose and alI of them must be evaluated as for their stability in physiological environments and mechanical strength. The main objective of this work is to develop biomaterials for use in fulfilIing of bone defects. The hydroxyapatite, similar bioactive ceramics to the mineral part of the tissue bone, is a material that could be used for this purpose. However, this ceramics possess decreases tenacity to the breaking and resistance mechanics the compression. With the purpose to get more adequate materiaIs for bone restorations and craniomaxilofacials implantations associates had been hydroxyapatite gotten in the laboratory of ceramic materiaIs of the DEMA-FEM-UNICAMP, particles of three ceramics bioinert, zirconia, alumina and titania, in the ratios of 30%, 40% and 50% in weight for each composition. The composites obtained and sintered were characterized by particles size measure, Scanning Electronic Microscopy, X Rays Difratometry and Spectroscopy of Fluorescence of X Rays and had its apparent densities and apparent porosity determined by the assay of Archimedes. Some mechanical properties as compressive strength, hardness and tenacity to the breaking had been performanced. The composites that had general behavior had been better chosen for continuity ofthe work (assays "in vitro" and "in vivo") (AU)