Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
Volume 106, Issue 4, Pages 1534-1545Publisher
WILEY
DOI: 10.1002/jbm.b.33964
Keywords
laser texturing; laser sintering; adhesion; Ti6Al4V; hydroxyapatite
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT) [SFRH/BPD/112111/2015, PTDC/EMS-TEC/5422/2014, NORTE 01-0145_FEDER-000018, UID/EEA/04436/2013]
- Fundo Europeu de Desenvolvimento Regional (FEDER) funds through the COMPETE -Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER-006941]
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This work presents a novel texture design for implants surface functionalization, through the creation of line-shaped textures on Ti6Al4V surfaces and subsequent sintering of hydroxyapatite (HAp) powder into the designated locations. HAp-rich locations were designed to avoid HAp detachment during insertion, thus guaranteeing an effective osseointegration. This process starts by creating textured lines using a Nd:YAG laser, filling these lines with HAp powder and sintering HAp using a CO2 laser. The adhesion of HAp is known to be influenced by HAp sintering parameters, especially laser power and scanning speed and also by the textured lines manufacturing. Different laser parameters combinations were used to assess the sintering and adhesion of HAp to the textured lines. HAp adhesion was assessed by performing high energy ultrasonic cavitation tests and sliding tests mimicking an implant insertion, with Ti6Al4V/HAp specimens sliding against animal bone. The HAp content retained after these tests was measured and results showed that an excellent HAp sintering and adhesion was achieved when using a scan speed of 1 mm/s and laser power between 9 and 9.6 W. It is important to emphasize that results indicated that the HAp bioactivity was maintained when using these conditions, validating this functionalization process for the production of hip prosthesis with improved bioactivity. (c) 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1534-1545, 2018.
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