BMP-2 immobilized on nanocrystalline diamond-coated titanium screws; demonstration of osteoinductive properties in irradiated bone.

Department for Cranio-, Maxillofacial and Oral Surgery, Medical University Innsbruck, Innsbruck, Austria. frank.kloss@i-med.ac.at

Head & neck 2013 Feb

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Irradiation results in impaired bone healing. Thus, osteosynthesis procedures are afflicted with increased failure rates. To improve osseointegration bone morphogenetic protein-2 (BMP-2) immobilized on nanocrystalline diamond (NCD)-coated implant surfaces might be 1 solution. By 4 weeks after irradiation of pig's mandible with a dose of 60 Gy a fracture was accomplished. Osteosynthesis was performed either with titanium osteosynthesis screws or NCD-coated screws with immobilized BMP-2. Nonirradiated animals served as control. After 1, 2, 4, and 8 weeks screws were evaluated histologically. Bone biopsies were gained to extract mesenchymal stem or precursor cells (MSCs). MSCs after irradiation demonstrated a behavior comparable to that of unirradiated cells. Consequently, immobilized BMP-2 resulted in an initial increased bone contact ratio (p = .014) but demonstrated no sustainable effect compared with osseointegration in nonirradiated bone (p = .08). Immobilized BMP-2 demonstrates an osteoinductive effect in irradiated bone. MSCs as effector cells possess protective mechanisms to overcome the destructive effect of irradiation. Copyright © 2012 Wiley Periodicals, Inc.

Citation

Frank R Kloss, Sarvpreet Singh, Oliver Hächl, Julia Rentenberger, Thomas Auberger, Anna Kraft, Guenther Klima, Thomas Mitterlechner, Doris Steinmüller-Nethl, Bernd Lethaus, Michael Rasse, Guenter Lepperdinger, Robert Gassner. BMP-2 immobilized on nanocrystalline diamond-coated titanium screws; demonstration of osteoinductive properties in irradiated bone. Head & neck. 2013 Feb;35(2):235-41