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  • Title: Development of a rat model of bisphosphonate-related osteonecrosis of the jaw (BRONJ).
    Author: Marino KL, Zakhary I, Abdelsayed RA, Carter JA, O'Neill JC, Khashaba RM, Elsalanty M, Stevens MR, Borke JL.
    Journal: J Oral Implantol; 2012 Sep; 38 Spec No():511-8. PubMed ID: 21905888.
    Abstract:
    The purpose of this study was to develop a rat model predictive of bisphosphonate-related osteonecrosis of the jaw (BRONJ) after exodontias. Thirty female rats were randomized into 2 groups, control and experimental. The experimental group received 2 intravenous injections of zoledronate (20 μg/kg). The mesial root of the right mandibular first molar was extracted. Rats were euthanized at 0, 4, and 8 weeks. Bone mineral density (BMD), collagen breakdown (pyridinium [PYD]), vascular regeneration (VEGF), and histology were examined. A trend toward higher PYD values was suggested in control vs experimental groups after wounding. Serum VEGF increased significantly after wounding for both control and experimental groups. After 8 weeks, VEGF continued to rise for the experimental group only. In the extraction socket area, BMD was significantly lower after wounding in control vs. zoledronate-treated rats. Histology sections from experimental groups showed bacteria and bone necrosis. Consistent findings of BRONJ features similar to those in humans were observed after zoledronate treatment.
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