SLA Surface in Dental Implants: How It Works and Why It Matters

SLA Surface Treatment: The Science Behind IGEA Osseointegration

The surface of a dental implant is as important as the material it is made from. Mesa Italia uses the SLA treatment (Sandblasted Large-grit Acid-etched) for the IGEA implant system: a two-phase process that creates the ideal surface topography for osseointegration.

What SLA Means

SLA stands for Sandblasted Large-grit Acid-etched. It is a surface treatment combining two distinct processes to create a dual-level topography:

1. Large-grit sandblasting: high-velocity abrasive particles strike the titanium implant surface, creating macro-roughness (cavities of 20-40 micrometres)
2. Acid etching: the implant is immersed in an acid solution that selectively dissolves the metal, generating micro-roughness (cavities of 1-3 micrometres)

Why Dual Roughness Is Critical

The combination of macro-roughness and micro-roughness is the key factor that distinguishes SLA from machined or sandblasted-only surfaces:

Macro-roughness (20-40 um) — Mechanical Anchorage

The large cavities created by sandblasting provide primary mechanical retention. Newly forming bone grows into the surface irregularities, creating a strong, stable physical bond that resists dislocation forces.

Micro-roughness (1-3 um) — Biological Adhesion

The micro-cavities generated by acid etching dramatically increase the effective contact surface area. At this dimensional level, osteoblast cells adhere to the surface, differentiate, and begin depositing bone matrix directly on the implant.

The Osseointegration Process with SLA Surface

Osseointegration with SLA surface follows a precise biological sequence:

1. Protein adsorption (minutes): blood proteins preferentially bind to the micro-rough surface
2. Cell adhesion (hours): thrombocytes and mesenchymal cells adhere to the adsorbed proteins
3. Osteoblastic differentiation (days): mesenchymal cells differentiate into osteoblasts on the micro-rough surface
4. Bone matrix deposition (weeks): osteoblasts deposit bone matrix that mineralises, forming lamellar bone
5. Remodelling (months): bone reorganises under functional load, achieving long-term stability

SLA and the IGEA System: Clinical Results

The SLA treatment applied to the Grade 4 Titanium of the IGEA system has produced significant clinical results:

• Survival rate: 99.97% cumulative
• Implants placed: over 20,000
• Follow-up: 4 years
• Placement: crestal and sub-crestal, in all bone types

The combination of pure Grade 4 Titanium (maximum biocompatibility) with the SLA surface (optimal osseointegration) and the 0.3 mm machined collar (which prevents sub-crestal bacterial colonisation) represents the complete design approach of the IGEA system.

SLA in the Context of Surface Treatments

Several surface treatments exist in the implantology landscape. SLA stands out for:

• Predictability: industrially controllable and repeatable process
• Scientific literature: extensively documented in in vitro and in vivo studies
• Dual roughness level: simultaneous optimisation of mechanical and biological anchorage
• Compatibility with pure titanium: does not alter the chemical composition of the substrate

Manufacturing and Quality

The SLA treatment of IGEA implants is performed entirely at the Mesa Italia facility in Travagliato (Brescia, Italy), with rigorous daily inspections using precision optics. Every process phase is tracked and certified to ISO 13485 and CE/MDR standards.

Mesa Italia — Since 1975, precision metallurgy Made in Italy for dentistry. Over 75 countries worldwide.