Effect of HAp and β‐TCP incorporation on the tribological response of Ti6Al4V biocomposites for implant parts

Abstract

Titanium and its alloys have been widely used in many engineering areas due to their properties. Despite having a high implant-tissue osseointegration time, Ti6Al4V has been extensively used in prosthesis and articular implants. To promote a faster bone ingrowth and consequently reduce the implant fixation time, the addition of a bioactive phase to form a biocomposite seems to be an excellent solution. Because of their bioactivity and similarity in composition with the human bone, HAp and β-TCP are two of the most widely used calcium phosphates in biomedical applications. To guarantee a strong adhesion of the previous bioactive materials in the implants surface, samples of Ti6Al4V, Ti6Al4V+HAp (10 vol %) and Ti6Al4V+β-TCP (10 vol %) TCP were processed by the hot pressing technique. Tribological tests against Al O lubricated in PBS at 37°C were carried out on a ball-on-flat reciprocating sliding geometry. Loads in the range of 3 N to 30 N were applied and their effect on the friction behavior and wear resistance of the tested materials was evaluated. Values of the coefficient of friction as well as the wear rate tend to increase with the addition of a bioactive phase to the Ti alloy. Micrographs of the worn surfaces showed that abrasion and plastic deformation are the prevailing wear mechanisms in the studied tribosystems. For biocomposites, particularly in the case of Ti6Al4V+HAp, pull-out of bioactive particle clusters has a determinant role on the tribological response, increasing both the friction coefficient and the specific wear rate. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1010-1016, 2018.

TiAl6V4 Alloy Surface Modifications and Their Impact on Biofilm Development of S. aureus and S. epidermidis

“…Due to its mineral components and bioactivity being significantly similar to that of human bone, this material promotes osseointegration and reduces the time taken for the implant to attach to the bone. For these reasons, hydroxyapatite and tricalcium phosphate are among the most commonly used calcium phosphates in biomedicine [44]. Rough-blasted TiAl6V4 was produced to generate a surface structure with micrometer-sized unevenness in which the osteoblasts could easily attach themselves.…”

Corrosion behaviour of PEEK or β-TCP-impregnated Ti6Al4V SLM structures targeting biomedical applications

“…The addition of this ceramic to a Ti matrix is expected to induce a natural bone tissue growth, and consequently promote a faster bone-tissue osseointegration [11,12]. On the other hand, Ti6Al4V also presents poor wear resistance and tends to release metallic ions and wear debris to the surrounding medium [13][14][15]. To overcome these issues, Poly-ether-ether-ketone (PEEK) and PEEK-based materials have been applied due to their excellent thermal and chemical stability and higher wear resistance, comparing to Ti and its alloys [16,17].…”

Effect of Cobalt–Chromium–Molybdenum Implant Surface Modifications on Biofilm Development of S. aureus and S. epidermidis

“…TCP consist of 70% brushite (CaHPO 4 2•H 2 O) and 30% hydroxyapatite (Ca 5 (PO 4 ) 3 OH). The calcium phosphate provides an advantage for osteoinduction to its surface as its bioactivity is highly similar to that of bone material and it thus facilitates improved cell growth and cytocompatibility ( Dantas et al, 2018 ).…”