Biotec Implant

Increased roughness of an implant could be achieved by blasting the surface by small particles, usually called sandblasting or grit blasting.

When the particles hit the implant surface it will create a crater. The surface roughness is hence dependent on the bulk material, the particle material, the particle size, the particle shape, the particle speed and the density of particles.

The resulting surface roughness is usually anisotropic consisting of craters and ridges and occasionally particles embedded in the surface.

The surface roughness increases with the size of the particles used where 25 pm particles blasted surfaces were rougher than the machined surface while smoother than 75 pm and 250 pm blasted surfaces.

Typical Sa values are 0.5-2.0 pm. Further, implants blasted with 25 pm and 75 pm particles show higher removal torque compared to a machined implant surface after 12 weeks of healing in either rabbit tibia or femur.