NANOSTRUCTURED COATING MATERIALS ON TITANIUM IMPLANTS FOR ENHANCED OSSEOINTEGRATION AND CLINICAL OUTCOMES A SYSTEMATIC REVIEW AND META-ANALYSIS

Statement of Problem:Titanium implants, while widely used in dental and orthopedic applications, often face
challenges related to early-stage osseointegration and implant failure, particularly in compromised patients. Surface
modifications using nanostructured coatings have been proposed to improve implant integration and biological
performance, yet evidence across studies remains fragmented.
Purpose:To systematically evaluate and quantify the impact of nanostructured coatings on titanium implants in terms
of osseointegration, mechanical fixation, and clinical performance through a comprehensive review and meta-analysis.
Materials and Methods:This systematic review and meta-analysis followed PRISMA guidelines. A thorough
literature search was conducted across PubMed, Scopus, Web of Science, and other databases to identify eligible in
vivo, in vitro, and clinical studies evaluating nanostructured coatings on titanium implants. A total of 51 studies were
included. Key outcomes such as bone-to-implant contact (BIC), removal torque values, and histological bone formation were extracted. Risk of bias was assessed using SYRCLE and modified ToxRTool. Meta-analyses were conducted using a random-effects model, and heterogeneity was evaluated using I² statistics. Funnel plots and Egger’s regression were used to assess publication bias.
Results:Nanostructured coatings significantly improved osseointegration indicators. Meta-analysis revealed substantial improvements in removal torque (Cohen’s d = 5.97; 95% CI: 3.72–8.22), bone-to-implant contact (Cohen’s d = 4.68; 95% CI: 2.95–6.41), and histomorphometric outcomes. Heterogeneity was moderate to high (I² ≈ 60–65%). Subgroup analyses highlighted variation in effectiveness based on coating materials (e.g., TiO₂ nanotubes, hydroxyapatite, metal ions). Funnel plots and Egger’s test indicated minimal publication bias.
Conclusions:Nanostructured coatings on titanium implants significantly enhance early-stage osseointegration and
biomechanical stability, with additional potential for antibacterial properties. While preclinical evidence is robust,
further multicentric clinical trials with standardized protocols are required to confirm translational efficacy and longterm outcomes.