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Improved bio-implant using ultrafast laser induced self-assembled nanotexture in titanium
Joshua R Bush1, Barada K Nayak, Lakshmi S Nair
1Department of Orthopaedic Surgery, University of Virginia, Charlottesville, Virginia 22908, USA.
Summary
New laser texturing creates advanced metal implant surfaces. This process enhances bone integration and cell attachment, potentially extending implant lifespan beyond 10 years.
Area of Science:
- Biomaterials Engineering
- Surface Science
- Orthopedic Implants
Background:
- Current metal implant materials have smooth surfaces, leading to failures within 10 years.
- Surface texturing aims to improve implant integration with surrounding bone.
- Existing texturing methods may be complex or limited in scale.
Purpose of the Study:
- To develop a novel, flexible single-step ultrafast-laser texturing process for metal implant surfaces.
- To evaluate the surface properties and biological response of laser-textured titanium.
- To assess the potential of the textured surface to improve implant integration and longevity.
Main Methods:
- Utilized an ultrafast-laser to create a multi-scale surface texture (micron, submicron, nano-scale) on titanium samples.
- Assessed surface hydrophilicity by measuring contact angles over time.
- Cultured mesenchymal stem cells and human bone marrow cells on textured and control titanium surfaces.
- Quantified cell numbers, cell bridging, and expression of key bone formation genes (alkaline phosphatase, osteocalcin).
Main Results:
- The laser texturing process created surfaces with micron-scale peaks and troughs, plus submicron and nano-scale features.
- Textured titanium surfaces remained completely hydrophilic, showing no measurable contact angle.
- Increased numbers of mesenchymal stem cells were observed on textured surfaces compared to controls.
- Extensive formation of cellular bridges by stromal cells indicated favorable cell attachment and differentiation.
- Increased expression of alkaline phosphatase and osteocalcin genes was observed in human bone marrow cells.
Conclusions:
- A single-step ultrafast-laser texturing method effectively creates multi-scale surface features on metals.
- The textured surfaces promote enhanced cell attachment, proliferation, and differentiation, crucial for bone integration.
- This technology offers a significant advancement for improving the integration and lifespan of joint replacement implants.
