Bone Response to Titanium Implants Coated with Double- or Single-Stranded DNA.

Area of Science:

• Biomaterials Science
• Orthopedic Research
• Dental Implantology

Background:

• Titanium (Ti) implants are widely used in bone reconstruction.
• Enhancing osseointegration and early bone formation is crucial for implant success.
• The role of DNA structure in modulating implant surface properties and biological response requires further investigation.

Purpose of the Study:

• To evaluate the in vivo bone response and in vitro apatite formation of titanium implants coated with double-stranded DNA (DNA-d) or single-stranded DNA (DNA-s).
• To compare the influence of different DNA structures (double vs. single strand) on bone response and apatite formation on titanium implant surfaces.

Main Methods:

• Titanium implants were coated with multilayered DNA-d/protamine or DNA-s/protamine.
• Bone responses were evaluated in vivo after implantation into rat maxillary molar sockets.
• Apatite formation was assessed in vitro using quartz crystal microbalance (QCM) in simulated body fluid (SBF).

Main Results:

• DNA-d/protamine and DNA-s/protamine coatings resulted in rougher, more hydrophilic titanium surfaces compared to untreated Ti.
• Animal studies demonstrated higher bone-to-implant ratios at 3 and 6 weeks post-implantation with both DNA coatings.
• QCM analysis indicated significantly accelerated apatite formation on coated surfaces immersed in SBF.

Conclusions:

• Both DNA-d/protamine and DNA-s/protamine coatings effectively enhance early bone formation around titanium implants.
• DNA-multilayer coatings represent a promising surface modification strategy for improving titanium implant performance.
• The structure of DNA (double vs. single strand) does not impede its beneficial effects on bone response and apatite formation.