Enhanced Osseointegration of Hierarchically Structured Ti Implant with Electrically Bioactive SnO2-TiO2 Bilayered Surface

Rui Zhou, Yong Han*, Jianyun Cao, Ming Li, Guorui Jin, Yuzhou Du, Haoteng Luo, Yongchao Yang, Lizhai Zhang, Bo Su

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

4 Citations (Scopus)
155 Downloads (Pure)

Abstract

The poor osseointegration of Ti implant significantly compromise its application in load-bearing bone repair and replacement. Electrically bioactive coating inspirited from heterojunction on Ti implant can benefit osseointegration but cannot avoid the stress shielding effect between bone and implant. To resolve this conflict, hierarchically structured Ti implant with electrically bioactive SnO2-TiO2 bilayered surface has been developed to enhance osseointegration. Benefiting from the electric cue offered by the built-in electrical field of SnO2-TiO2 heterojunction and the topographic cue provided by the hierarchical surface structure to bone regeneration, the osteoblastic function of basic multicellular units around the implant is significantly improved. Because the individual TiO2 or SnO2 coating with uniform surface exhibits no electrical bioactivity, the effects of electric and topographic cues to osseointegration have been decoupled via the analysis of in vivo performance for the placed Ti implant with different surfaces. The developed Ti implant shows significantly improved osseointegration with excellent bone-implant contact, improved mineralization of extracellular matrix, and increased push-out force. These results suggest that the synergistic strategy of combing electrical bioactivity with hierarchical surface structure provides a new platform for developing advanced endosseous implants.

Original languageEnglish
Pages (from-to)30191-30200
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number36
Early online date21 Aug 2018
DOIs
Publication statusPublished - 12 Sep 2018

Keywords

  • electrical bioactivity
  • hierarchical structure
  • osseointegration
  • SnO-TiO
  • Ti implant

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