SLA type

Surface

treatments

There is extensive scientific literature on how surface roughness characteristics influence cells behaviour. Compared to a smooth surface, topographical patterns smaller in size than a fibroblast cell (micro and nano topography) orient the arrangement of the cells and stimulate osteoblastic and platelet activity, accelerating the production of extracellular matrix and bone regeneration, and therefore the osseointegration of the dental implant. The three fundamentals of surface treatment of dental implants from a biological point of view are:

• Control of surface topography to stimulate a cellular response in an osteogenic direction;

• Control of the chemical composition of the surface to promote cell colonization;

• Control of biological contamination from adherent endotoxins so as not to interfere with the natural inflammatory response;

trattamento

MAG
52 X
WD
11.5 mm
EHT
20.00 kV
Signal A
CZ BSD

trattamento

MAG
200 X
WD
11.0 mm
EHT
20.00 kV
Signal A
CZ BSD

MAG
1.50 K X
WD
11.5 mm
EHT
20.00 kV
Signal A
SE1

For the surface treatment a sand-blasting process was used, followed by a double acid attack. In the images, increasing the magnification, it is possible to observe how the macroscopic aspects of the screw (spire, cutting edge) are not affected by the treatment and how the surface is free from processing residue. The dual-beam roughness typical of SLA treatment can be observed and it contains large cavities due to large grit blasting on which is superimposed the micro-roughness due to treatment with acids. The micro-roughness illustrated in the figures highlights the typical three-dimensional topography, which gives these surfaces “sponge-like” characteristics that are the basis of their excellent clinical performance In fact, the very short peak-to-peak distance, about 1 micrometer, stimulates both the activity of osteogenic cells and the capillary penetration of the blood in the surface structure, offering very favorable characteristics to stimulate bone regeneration, as described in many articles on this topic. This unique combination of long-range roughness (large grit sand-blasting) and short-range (acid etching) is a substrate favourable to cell regrowth that adequately promotes cell differentiation. The level of roughness is Ra 1.42 ± 0.12.

Surface treatment on the implant body.

Partial surface treatment on the implant body with hyaluronic acid. Cold plasma decontamination.

trattamento

Sa 0,50 µm

Overall mean value on a measuring area of 30×30 μm. Cold plasma decontamination.

trattamento

Sa 1,90 µm

Overall mean value on a measuring area of 30×30 μm. Sand-blasting, double etching, cold plasma decontamination.

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