Plasma-sprayed hydroxylapatite coating on carbon fibre reinforced thermoplastic composite materials

Abstract

Plasma-spraying of metallic implant surfaces is an established method for the application of hydroxylapatite (HA) coatings. Carbon fibre reinforced thermoplastics show different thermal and mechanical properties, compared with titanium substrates. In this paper first results of the influence of the established coating method on carbon fibre reinforced thermoplastics are presented. First investigations of the tensile adhesion strength, tested with a newly developed testing device, showed that the adhesion between the HA coating and the carbon fibre reinforced polyetheretherketone (PEEK) composite is very low. Macromechanical bending tests showed a change to initial tensile instead of compression failure of the coated composite substrate. Micromechanical bending tests in a scanning electron microscope (SEM) hot tensile stage (Raith GmbH) revealed crack propagation within the ceramic coating and in the coating-substrate interface before the total failure of the composite substrate occurred.

PEEK biomaterials in trauma, orthopedic, and spinal implants

“…Consequently, the study and modification of polymer interfaces, as opposed to composite engineering of the bulk biomaterial, is another active area of academic and commercial research involving PEEK. In an effort to improve the boneimplant interface, investigators have coated PEEK and PEEK composites with Ti alloy, as well as with hydroxyapatite (HA) [96,107]. Plasma deposition processing techniques are compatible with PEEK [96,108].…”

Enhanced bone healing around nanohydroxyapatite-coated polyetheretherketone implants: An experimental study in rabbit bone

“…15 This can be achieved in a number of ways, for example by applying coating with osteoconductive properties on the PEEK surface, such as with hydroxyapatite (HA). 10,[16][17][18] Due to its similarity to the mineral phase of natural bone tissue, artificial HA has been used over several decades as a bioactive coating material 19,20 and has been shown to have enhancing effects on osseointegration when coated onto implants. 21 There are several techniques for coating HA onto PEEK surfaces.…”

“…21 There are several techniques for coating HA onto PEEK surfaces. For example, surface modifications have been performed through electron beam deposition of titanium, 22 plasma spray deposition of HA, 10 and spin coat deposition of a thin layer of nanocrystalline HA. 23 Some concern has been raised over the thickness of the HA coating and studies using thicker coatings of >10 mm have demonstrated complications with detachment of the coating from the bulk material.…”

PEEK materials as an alternative to titanium in dental implants: A systematic review

“…Studies had shown that when compared to Ti, PEEK stimulates less osteoblast differentiation. In an attempt to increase the osseoconductive properties of PEEK, it is coated and blended with bioactive particles . Various modifications had been done to enhance the surface characteristics of PEEK materials and to make it more biocompatible.…”