Necrose óssea térmica em tíbias de coelhos: estudo comparativo entre as técnicas de corticotomias utilizando broca e osteotomo com serra oscilante

Abstract

Corticotomy is a surgical procedure for the realization of distraction osteogenesis to promote lengthening or bone transport. Cell biology is essential for distraction osteogenesis. There corticotomies performed by drill and osteotome, Gigli saw and oscillating saw. The techniques employed to the corticotomy can lead to thermal bone necrosis and thus impair cell biology. The objective of this work is the study of bone necrosis in thermal corticotomy performed by drilling with drill associated with osteotome and oscillating saw. We used 12 New Zealand rabbits, adults, and divided into two groups of six. One group underwent corticotomy with oscillating saw and the other underwent corticotomy with auger associated with osteotome. Were subjected to process histotechnical with nitric acid demineralization and staining by hematoxylin and eosin, the study of light microscopy, and count gaps with viable osteocytes,lacunae with osteocytes core picnocítico empty and gaps. From the assessment of cell viability determined which technique promoted more bone thermal necrosis. The corticotomies performed with drill associated with osteotome showed higher amount of empty lacunae and gaps with picnócitos compared to viable cells that corticotomies performed with oscillating saw. It was concluded that the corticotomies with drill associated with osteotomes cause greater thermal bone necrosis than corticotomies performed with oscillating saw.