Bone regenerating effect of surface-functionalized titanium implants with sustained-release characteristics of strontium in ovariectomized rats

Vincent Offermanns*, Ole Zoffmann Andersen, Gregor Riede, Inge Hald Andersen, Klaus Pagh Almtoft, Soren Sorensen, Michael Sillassen, Christian Sloth Jeppesen, Michael Rasse, Morten Foss, Frank Kloss

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Since strontium (Sr) is known for its anabolic and anticatabolic effect on bone, research has been focused on its potential impact on osseointegration. The objective of this study was to investigate the performance of nanotopographic implants with a Sr-functionalized titanium (Ti) coating (Ti-Sr-O) with respect to osseointegration in osteoporotic bone. The trial was designed to examine the effect of sustained-release characteristics of Sr in poor-quality bone. Three Ti-Sr-O groups, which differed from each other in coating thickness, Sr contents, and Sr release, were examined. These were prepared by a magnetron sputtering process and compared to uncoated grade 4 Ti. Composition, morphology, and mechanical stability of the coatings were analyzed, and Sr release data were gained from in vitro washout experiments. In vivo investigation was carried out in an osteoporotic rat model and analyzed histologically, 6 weeks and 12 weeks after implantation. Median values of bone-to-implant contact and new bone formation after 6 weeks were found to be 84.7% and 54.9% (best performing Sr group) as compared to 65.2% and 23.8% (grade 4 Ti reference), respectively. The 12-week observation period revealed 84.3% and 56.5% (best performing Sr group) and 81.3% and 39.4% (grade 4 Ti reference), respectively, for the same measurements. The increase in new bone formation was found to correlate with the amount of Sr released in vitro. The results indicate that sputtered nanostructured Ti-Sr-O coatings showed sustained release of Sr and accelerate osseointegration even in poor-quality bone, and thus, may have impact on practical applications for medical implants.

Original languageEnglish
JournalInternational Journal of Nanomedicine
Volume11
Pages (from-to)2431-2442
Number of pages12
ISSN1176-9114
DOIs
Publication statusPublished - 2016

Keywords

  • nanotopography
  • osteoinduction
  • osseointegration
  • osteoporosis
  • rodent
  • PARTIALLY EDENTULOUS PATIENTS
  • DENTAL IMPLANTS
  • NANOCRYSTALLINE DIAMOND
  • IN-VIVO
  • OSSEOINTEGRATION
  • OSTEOPOROSIS
  • RANELATE
  • SURVIVAL
  • MODEL
  • RISK

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