Abstract
M.Eng. (Mechanical Engineering)
High speed machining (HSM) has the potential to greatly increase
productivity and to lower manufacturing costs if workpiece surface
integrity can be controlled. The surface fmish of a biomaterial is
vitally important for proper implant functioning, and is the focus of
this study. Grade 4 titanium was turned on a lathe with cutting speeds
increasing from the conventional to the high speed range. The surface
finish was assessed using profilometry, atomic force microscopy, and
contact angle measurement. The ability of the material to bond
directly with bone was predicted by cell adhesion studies. Results
indicate that there is a general relationship between cutting speed,
surface roughness, contact angle, and cell adhesion. Turning grade 4
titanium at cutting speeds between 150m/min and 200m/min may
provide an optimal surface for osseointegration.