A Newly Created Meso-, Micro-, and Nano-Scale Rough Titanium Surface Promotes Bone-Implant Integration

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Dental Implantology

Background:

• Titanium implants are standard for bone reconstruction and tooth restoration.
• Current micro-rough titanium surfaces show limited improvement in osseointegration over 30 years.
• A need exists for enhanced titanium surfaces to improve implant integration.

Purpose of the Study:

• To develop and characterize a novel titanium surface with multi-scale roughness (meso-, micro-, and nano-scales).
• To evaluate the biological performance and optimize osseointegration of this new surface.
• To compare the efficacy of the novel surface against conventional micro-rough surfaces.

Main Methods:

• Commercially pure titanium was acid-etched with sulfuric acid at varying temperatures (120-150 °C).
• Surface morphology was analyzed for meso-, micro-, and nano-scale features.
• Osteoblast attachment, spreading, differentiation, and in vivo osseointegration were assessed.
• Regression analysis was used to correlate surface characteristics with osteoconductivity.

Main Results:

• Temperatures of 140 °C and 150 °C produced unique meso-scale spikes and nano-scale structures alongside micro-scale features.
• The three-scale rough surface exhibited 6-12 times greater roughness (Ra) than micro-rough surfaces.
• Osteoblast attachment and spreading were not compromised by the increased roughness.
• Significant improvements in osteoblast differentiation and in vivo osseointegration were observed.
• Meso-scale spike size and density strongly correlated with enhanced osteoconductivity.

Conclusions:

• A novel titanium surface with distinct meso-, micro-, and nano-scale roughness was successfully created.
• This multi-scale rough surface significantly enhances osteoconductivity and osseointegration compared to conventional surfaces.
• The optimal osseointegration was achieved with acid-etching at 140 °C.
• This surface holds promise for dental implants, orthopedic surgery, and bone tissue engineering scaffolds.