Vol. 33, Nº 2
Regeneration of experimental long bone defect after implantation in its cavity of osteoplastic material “Calc-i-oss”
KEYWORDS: femoral bone, ?-tricalcium phosphate, reparative osteogenesis.
ABSTRACT: Introduction: There is a significant divergence of data on the rate of resorption and replacement by the bone tissue of osteoplastic materials based on ?-tricalcium phosphate in cancellous bone. At the same time in literature missing morphometric and electron microscopic features of bone tissue of the regenerate of compact substance of bone in these conditions. This study was aimed at the assessment of the healing of compact bone tissue defect after implantation of osteoplastic material “Calc-i-oss?” with the definition of the dynamics of resorption and morphological characteristics of bone tissue of the regenerate. Material and Methods: In the middle third of the diaphysis of the femur of rats there was reproduced the perforated defect to the bone-brain channel that was filled with osteoplastic material “Calc-i-oss?”. After surgery the fragments of injured bones were studied at the 60th and 120th day by methods of light microscopy with morphometry and scanning electron microscopy. Results: The conducted research revealed no inflammatory reaction at the site of the defect, signs of necrobiosis and necrosis of osteocytes in adjacent to the site of implantation maternal bone. The site of defect was filled with lamellar bone tissue high in osteoblasts, osteocytes and with integrated into its structure remains of “Calc-i-oss?”. On the surface and inside the implant there were found osteogenic cells and bone foci. It was established that the osteoplastic material throughout the observation period is subjected to development and replacement by bone tissue of the regenerate, the ratio of which on the 60th day of the experiment was 25.72 ± 2.06% to 74.28 ± 2.06%, and on the 120th day – 18.31 ± 1.54% to 81.69 ± 1.54%. Conclusion: Osteoplastic material “Calc-i-oss?” exhibits biocompatibility, osteoconductive properties, ability to resorption and is replaced by bone tissue, with which it integrates well.