resumo
A hip joint wear simulator is used for the first time to evaluate the performance of acetabular liners and femoral heads made of silicon nitride ceramic coated with nanocrystalline diamond (NCD), grown by a hot filament chemical vapor deposition (HFCVD) method. Wear is assessed by gravimetry, by which volume and linear wear are estimated. Even with only one million cycles of test, a very stimulating finding is the extremely low wear rate of the head after the diamond polishing running-in step, of about 0.005 mm(3)/million cycles (Mc). This corresponds to a linear wear of 0.08 mu m/Mc, one order of magnitude better than the best value currently known for ceramic-on-ceramic hip joints. Small scale abrasion is found as the dominant wear mechanism. (C) 2014 Elsevier Ltd. All rights reserved.
palavras-chave
STRUCTURAL ORTHOPEDIC IMPLANTS; SILICON-NITRIDE CERAMICS; METAL-ON-METAL; ARTHROPLASTY; PROSTHESES; REPLACEMENT; COATINGS; ALUMINA; CYTOTOXICITY; POLYETHYLENE
categoria
Engineering
autores
Amaral, M; Maru, MM; Rodrigues, SP; Gouvea, CP; Trommer, RM; Oliveira, FJ; Achete, CA; Silva, RF
nossos autores
Filipe José Alves de Oliveira
Investigador Principal
Margarida Isabel dos Santos Amaral
Bolseiro de pós-Doutoramento
Rui Ramos Ferreira e Silva
Professor associado
Simone Pereira Rodrigues
Bolseiro de investigaçãoagradecimentos
This work is financed by FEDER funds through the Program Operational Factors of Competitiveness - COMPETE and Portuguese National funds through the FCT - Fundacao para a Ciencia e Tecnologia under the project FCOMP-01-0124-FEDER-015147 (PWC/EME-PME/112910/2009). R.F. Silva acknowledges the research grant from CNPq