Osseointegration of titanium implants functionalised with phosphoserine-tethered poly(epsilon-lysine) dendrons: a comparative study with traditional surface treatments in sheep

摘要

The aim of this study was to analyse the osseointegrative potential of phosphoserine-tethered dendrons when applied as surface functionalisation molecules on titanium implants in a sheep model after 2 and 8 weeks of implantation. Uncoated and dendron-coated implants were implanted in six sheep. Sandblasted and etched (SE) or porous additive manufactured (AM) implants with and without additional dendron functionalisation (SE-PSD; AM-PSD) were placed in the pelvic bone. Three implants per group were examined histologically and six implants were tested bio-mechanically. After 2 and 8 weeks the bone-to-implant contact (BIC) total values of SE implants (43.7 +/- 12.2; 53.3 +/- 9.0 %) and SE-PSD (46.7 +/- 4.5; 61.7 +/- 4.9 %) as well as AM implants (20.49 +/- 5.1; 43.9 +/- 9.7 %) and AMPSD implants (19.7 +/- 3.5; 48.3 +/- 15.6 %) showed no statistically significant differences. For SE-PSD and AMPSD a separate analysis of only the cancellous BIC demonstrated a statistically significant difference after 2 and 8 weeks. Biomechanical findings proved the overall increased stability of the porous implants after 8 weeks. Overall, the great effect of implant macro design on osseointegration was further supported by additional phosphoserine-tethered dendrons for SE and AM implants.