Comparing Dental Implant Surfaces: SLA, SLActive, and RBM
Why Implant Surface Matters
During the first seconds after placement, blood and plasma proteins attach to the implant surface, forming a fibrin network that guides osteoblast migration. Surface chemistry and topography determine how quickly and efficiently these biological events occur, making surface design essential for predictable osseointegration.
1. SLA Surface (Sandblasted, Large-grit, Acid-etched)
The SLA surface is produced by large-grit sandblasting followed by acid etching, creating a micro-rough topography ideal for bone anchorage.
Advantages
- Proven long-term clinical success
- Improved BIC compared to smooth surfaces
- Suitable for most routine implant cases
Limitations
- Hydrophobic—slower initial wetting and protein adhesion
- Higher affinity for hydrophobic bacteria
2. SLActive Surface — Hydrophilic SLA
SLActive is a modified SLA surface, processed in a nitrogen environment and stored in saline to maintain super-hydrophilicity. This dramatically enhances initial biological interactions.
Key Scientific Findings
Animal studies (including sinus augmentation models) demonstrate:
- Higher BIC at 2 and 4 weeks compared to SLA
- Accelerated formation of woven and lamellar bone
- Significantly less soft tissue in the interthread area
Advantages
- Rapid osseointegration
- Ideal for immediate and early loading
- Excellent performance in grafted or low-density bone
- Reduces adhesion of hydrophobic bacteria
3. RBM Surface (Resorbable Blast Media)
RBM surfaces are created using bioresorbable media such as calcium phosphate. This eliminates contamination risk from residual blasting particles.
Advantages
- Clean and uniform micro-roughness
- Lower risk of foreign particle retention
- Biocompatible and predictable for routine cases
Limitations
- Lower early BIC compared to SLA/SLActive
- Not recommended for immediate loading
Comparison Table
| Feature | SLA | SLActive | RBM |
|---|---|---|---|
| Hydrophilicity | Low | Very High | Moderate |
| Early Osseointegration | Good | Excellent | Moderate |
| Early BIC | Moderate | Highest | Lower |
| Immediate Loading Suitability | Conditional | Ideal | Not Recommended |
Which Surface Should You Choose?
SLActive® is the superior option for challenging clinical scenarios such as sinus lift, low-density bone, and cases requiring immediate loading. SLA® remains a highly reliable standard for everyday implant dentistry. RBM is appropriate for straightforward, non-complex cases.