Effect of surface roughness of ground titanium on initial cell adhesion

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Science

Background:

• Initial cell adhesion is crucial for osseointegration of titanium implants.
• Surface properties, including roughness, play a significant role in cell-material interactions.

Purpose of the Study:

• To investigate the effect of varying surface roughness of ground titanium on the initial adhesion of osteoblast-like U-2 OS cells.
• To determine the optimal surface roughness for enhanced initial osteoblast adhesion on titanium.

Main Methods:

• Titanium specimens were prepared with different surface roughness values using SiC sandpaper and Al2O3 polishing powder.
• Surface roughness (Ra) was quantified using profilometry and surface topography was analyzed with atomic force microscopy.
• Initial cell adhesion was assessed using MTT assay and cell spreading was characterized by crystal violet staining.

Main Results:

• The titanium specimen with an Ra of 0.15 microm (#1500 Ti) exhibited the highest optical density, indicating superior cell adhesion.
• Smoother surfaces (Ra: 0.05 and 0.07 microm) and rougher surfaces (Ra: 0.33 and 1.20 microm) showed reduced or contact-guided cell adhesion, respectively.
• A significant influence of surface roughness (Ra: 0.05-1.20 microm) on initial osteoblast-like cell adhesion was observed.

Conclusions:

• Surface roughness of ground titanium critically affects initial osteoblast-like cell adhesion.
• An optimal surface roughness (Ra: 0.15 microm) was identified for promoting initial cell adhesion on ground titanium.
• These findings provide insights for designing titanium implant surfaces with improved biological responses.