Osseointegration and Host Immune Response to Zirconia Implants: Current Evidence and Perspectives

Abstract

Background: Zirconia dental implants are increasingly explored as alternatives to titanium due to favorable osteointegration and biocompatibility. Objective: To review the osseointegration potential, immune response, and clinical relevance of zirconia implants, with attention to strategies aimed at improving performance. Results: Osseointegration is influenced by surface roughness, chemistry, and implant design. Surface treatments such as sandblasting, acid etching, laser structuring, and bioactive coatings improve topography, wettability, and osteoblast activity. Zirconia demonstrates high biocompatibility and generally favorable immune responses, including reduced inflammatory signaling and support for tissue healing, although clinical data remain limited. Its smooth surface and low plaque affinity may further support peri-implant tissue health. Emerging innovations in mechanical reinforcement, antibacterial modifications, and digital workflows, offer additional potential to enhance implant performance. Conclusion: Zirconia implants exhibit promising osseointegration and biocompatibility, but current evidence is insufficient to claim superiority over titanium. Further long-term clinical studies are required to validate these findings and optimize implant design and surface strategies.