Influence of different particle sizes of anorganic bovine bone matrix on bone repair process. Histologic and radiographic analysis of surgically created defects in rabbit calvaria / Influencia dos diferentes tamanhos de particulas da matriz ossea bovina anorganica no processo de reparo osseo ; : Analise histologica e radiografica de defeitos criados cirurgicamente em calvaria de coelhos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of this present study was to analyze, clinical and histologically, the influence of anorganic bovine bone matrix (ABBM) particle size on bone repair. Four calvarial defects of 8 millimeters each were prepared in 18 adult New Zealand rabbits, two in the right side, and two in the left side. The defects were filled with either particulate autogenous bone (control group); ABBM of large size granules; ABBM of medium size granules; or ABBM of small size granules. The animals were sacrificed at 15, 30, and 60 days after surgery. The samples were radiographic examined before being submitted to histological processing. The analysis of these radiographic images was performed by comparing them with images of the cranial bone not involved with the areas of osteotomy. Thus, it was observed that autogenous bone showed a slight radiopacity at the beginning which was increased at the final period, being very similar to the adjacent bone tissue in terms of radiopacity. The large and medium size ABBM particles maintained the same radiographic behavior, showing a radiolucid area in the central portion of the defect at 60 days. On the other hand, the ABBM of small size granules showed a slight radiolucity at the initial period, which was increased at the subsequent periods. The histological analysis showed a more intense bone formation within the control group (autogenous bone). With regards to the biomaterial, it was observed that all three particle sizes resulted in inflammatory infiltration at 15 and 30 days. The bone repair at the defects filled with ABBM of medium or large size granules was similar to each other, with the presence of a large amount of remaining particles and fibrous connective tissue in the defect at the final period. In contrast, ABBM of small size granules lead to a greater amount of osteoid tissue, and the particles were almost totally reabsorbed within 60 days of implantation. Based on these results, it was concluded that: (1) autogenous bone graft lead to the best result in terms of bone defect repair; (2) ABBM is a biocompatible material; (3) ABBM of large and medium size granules are not totally reabsorbed at the observed period; (4) ABBM of small size granules was more intensively reabsorbed, and lead to a greater osteoid tissue formation when compared to the medium and large ABBM granules

ASSUNTO(S)

ossos - enxerto substitutos osseos bone substitutes bones

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