Much effort has been put into achieving surface properties that will enhance the fixation in bone of dental implants. Previous studies have shown that topography on a micron level has influence over the incorporation of dental implants in bone. The screw-shaped implant design and choice of material (Ti) have had good success rate but could be improved. Increased surface roughness has been studied before on these implants where a randomly distributed roughness was produced by sand blasting. By producing a surface micropattern using precision laser micromachining, a controlled surface roughness is introduced. The controlled surface roughness also enables a better ability to isolate the topographic parameters responsible for, or active in, stimulating bone-growth at the surface.We used nanosecond pulsed laser ablation to pattern the implant surface, using a passive diffractive optic element (kinoform) as a beam-splitter. The pattern, a 2-D square lattice of 10 µm diameter hemispheres with a spacing of 30 µm, was produced on the flanks of the screw-shaped implants. Samples have been chemically and topographically characterized and are currently under biological evaluation.
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