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Laser and chemical surface modifications of titanium grade 2 for applications in middle ear implants
Kwasniak P. , Pura J. , Zwolinska M. , Skarzynski H. , Olszewski L. , Marczak J. , Garbacz H. , Kurzydlowski
Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland, 2Institute of Physiology and Pathology of
Hearing, Warsaw, Poland, 3World Hearing Center, Kajetany, Poland, 4Military University of Technology, Institute of Optoelectronics, Warsaw,
The surface topography of implants is a key parameter for both inducing and suppressing osteointegration
mechanism. It is commonly accepted that modification of prosthesis roughness allows for enhance implant-bone
adhesion and stimulate cell proliferation. However, optimal topography of the implants surface is still discussed
with the latest reports of favorable results obtained for multiscale (from nano- to micrometers) geometric features
[1]. In this work we present two approaches for functionalization flat and curved surfaces of titanium middle ear
implants. The presented methods include topography modifications with the double laser beam interference
technique and chemical etching. The used methodology allows for obtain clear and smooth Ti surface as well as
periodic striated topography with the roughness range from nano- to micrometers (Fig. 1.). The obtained
structures have been characterized in terms of shape, roughness, chemical composition, mechanical properties
and microstructures of substrate material. In order to achieve all information, numerous of research methods
have been used: scanning electron microscopy, atomic force microscopy, optical profilometery and
microhardness measurements. Demonstrated methodology can be used as an effective tool for manufacturing
periodic surface structures with variable geometrical parameters e.g. width, height of stripes and distance
between them. The future studies of in vitro cells growth on the surfaces with controlled topography will be also
highly valuable for precise description of the relation between implant surface structure and osteointegration
[Figure 1]
Fig. 1. AFM (atomic force microscopy) image of example striped structure obtained with double laser beam
interference technique
[1] D. Khong, J. Choi, Y-M Im, Y-J Kim, J-H Jang, S.S. Kang, T-H Nam, J. Song, J-W. Park, Biomaterials, 33
(2012) 5997.