HISTOMORPHOMETRIC EVALUATION OF BONE REPAIR AFTER CARBON/CARBON COMPOSITE IMPLANTATION IN LUMBAR VERTEBRAE IN RATS

The aim is to study the characteristics of bone regeneration under the conditions of implantation of carbon/carbon composite material with and without pyrocarbon coating in the vertebral bodies of rat. C/c composite (n=9) or c/c composite & PC (n=9) were implanted into hole defects in the LIII vertebral bodies of white laboratory male rats (6-7 months, weight 250-350 g). The material was made in the form of a cylinder (diameter 2 mm, height 2 mm). Histological and histomorphometric study were performed at 15, 30 and 90 days after implantation. After 15 days, bone and granulation tissues were found in the ratio of ½ along the perimeter of both materials. After 30 days, fibroreticular bone tissue and connective tissue of varying degrees of maturity formed around the implants. The relative content of new formed bone tissue near the c/c composite after 30 and 90 days was 1.4 times lower (p<0.001) compared with the c/c composite and PC group. The studied materials are biocompatible, do not interfere with bone regeneration, and do not cause inflammatory reactions. Osseointegration qualities are higher for the c/c composite & pyrocarbon coated.