Avaliação do crescimento ósseo em implantes de titânio revestidos por plasma spraying com diferentes interfaces metal-filme

• Ano de defesa: 2008
• Autor(a) principal: Cunha, Alexandre
• Orientador(a): Hübler, Roberto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre
• Palavras-chave em Português: ENGENHARIA DE MATERIAIS; OSSEOINTEGRAÇÃO (MEDICINA); OSSEOINTEGRAÇÃO (ODONTOLOGIA); IMPLANTES DENTÁRIOS OSSEOINTEGRADOS; PRÓTESE ORTOPÉDICA; TITÂNIO
• Link de acesso: http://hdl.handle.net/10923/3237

Titanium and its alloys are widely applied as orthopedic and dental materials implants because of their excellent biocompatibility, low elastic modulus and high corrosion and wear resistance. The main causes that influence the adequate biomaterial functionality are the bone tissue growth and its adhesion to the implant surface. Recent researches indicated that the adhesion between the living bone tissue and the implant is related to the surface roughness, due to surface modifications, and the increasing of bone ingrowths in this region. These surface modifications are achieved mostly by deposition of porous coating using thermal spraying technique, application of blasting of ceramic particulates and acid and electrochemical etchings. The main goal of this research is to estimate the osseointegration of titanium porous coating in contact with sheep cortical bone, as well as to evaluate the bone conductive behavior of these coatings. The second goal is to evaluate the adhesive strength of the titanium porous coatings deposited on modified surfaces of titanium coin shaped implants. X-ray fluorescence (XRF) and xray dispersive energy spectroscopy (EDS) were applied to verify the chemical composition of the Ti implants, titanium porous coatings and osseointegrated titanium implants. Scanning electron microscope (SEM) was applied to characterize the morphology of titanium coin shaped implants, titanium porous coating and the bone tissue/titanium porous coatings/titanium implants interface. Pull out tests were applied to evaluate the osseointegration and the adhesion of porous coatings on the surface of titanium coin shaped implants. The rupture tension values verified for titanium porous coatings are higher than the values verified for titanium implants without porous coatings (RENZ, 2007), mainly after 30 days of healing. The titanium porous coatings etched with HF showed the highest rupture tension values when compared with titanium porous coatings as deposited. The adhesion values of titanium porous coatings increased for modified surfaces when compared with the adhesion values verified for the machined surfaces.