Matriz porosa do BV60S associada a células osteoprogenitoras alógenas no tratamento de defeitos ósseos críticos em rádios de cães / Porous matrix of BG60S associated with allogenic osteoprogenitor cells in the treatment of critical bone defects in the radius of dogs

O objetivo do estudo foi avaliar o efeito da matriz porosa do biovidro 60S (BV60S) associada a células osteoprogenitoras (CO) alógenas no tratamento de defeitos ósseos críticos de cães. Foram utilizados 20 cães, machos, sem raça definida, com dois anos de idade e massa corporal média de 25kg. Com os cães sob anestesia geral, foram criados defeitos ósseos críticos no terço médio dos ossos rádios. Procedeu-se à fixação óssea com uma placa em ponte, e os defeitos foram tratados de acordo com cada grupo experimental. Constituíram-se três grupos experimentais, em que os defeitos ósseos foram preenchidos com: BV60S associado a CO alógenas (grupo BV60S+CO), osso autógeno (grupo C+), ou não preenchidos (grupo C-). A regeneração óssea foi avaliada por meio de exames radiográficos, densitométricos e histomorfométricos ao longo de 90 dias. Os grupos C- e BV60S+CO mostraram preenchimento ósseo parcial do defeito de, no máximo, 56,68% e 35,23%, respectivamente, sem a formação de ponte óssea entre as extremidades, e o controle positivo (C+) mostrou regeneração óssea completa. Conclui-se que a matriz porosa do BV60S associada às células osteoprogenitoras não é eficiente no tratamento de defeitos ósseos críticos em rádios de cães.(AU)

The objective of this study was to evaluate the effect of the porous matrix of bioglass 60S (BV60S) associated with allogenic osteoprogenitor cells (CO) in the treatment of critical bone defects of dogs. 20 male mongrel dogs at two years old and mean weight of 25kg were used. Dogs were anesthetized and critical bone defects were created in the middle third of the radios bones. With dogs under general anesthesia, critical bone defects were created in the middle third of bone radios. Bone fixation was done with a bridge plate and defects treated according to each experimental group. Three experimental groups were formed according to the treatment. The defects filled with BV60S associated with allogenic CO (Group-BV60S+CO), autogenous bone (Group-C+) or unfilled (Group-C-). Bone regeneration was evaluated by radiography, bone densitometry and histomorphometry over 90 days. The BV60S+CO and C- groups showed partial bone filling of the defect of at most 56.68% and 35.23%, respectively. No bone bridge formation was observed between the extremities in the BV60S+CO and C- groups. Positive control showed complete bone regeneration at 90 days. It was concluded that the porous matrix of BV60S associated with osteoprogenitor cells was not effective in the treatment of critical bone defects in the radius of dogs.(AU)

Matriz porosa do BV60S no tratamento de defeitos ósseos críticosem rádios de cães / Porous matrix of BG60S in the treatment of critical bone defects in the radius of dogs

O objetivo deste estudo foi avaliar o efeito da matriz porosa do biovidro de composição molar 60% SiO2 - 36% CaO - 4% P2O5 (BV60S) no tratamento de defeitos ósseos críticos de cães. Foram utilizados 20 cães, machos, sem raça definida, com dois anos e massa corporal média de 25kg. Foram constituídos três grupos experimentais: defeitos ósseos preenchidos com BV60S (BV), com osso autógeno (C+) e defeitos não preenchidos (C-). A regeneração óssea foi avaliada por meio de exames radiográficos, densitométricos e histomorfométricos ao longo de 90 dias. A matriz do BV60S mostrou rápida reabsorção com redução média de 12,62% a cada 15 dias. A regeneração foi completa no grupo C+ e incompleta nos grupos BV e C-, aos 90 dias. A área de neoformação óssea foi semelhante entre os grupos BV e C-, em todos os tempos estudados. Conclui-se que a matriz porosa do BV60S possui rápida reabsorção, não sendo eficiente no tratamento de defeitos ósseos críticos em rádios de cães.

The aim of this study was to evaluate the effect of the porous matrix of bioglass with molar composition of 60% SiO2, 36% CaO, 4% P2O5 (BV60S) in the treatment of critical bone defects in dogs. 20 male mongrel dogs at two years of age and a mean weight of 25 kg were used. Three experimental groups were formed: bone defects filled with BV60S (BV), with autogenous bone (C+) and unfilled defects (C-). Bone regeneration was evaluated by radiography, bone densitometry and histoforfometry over 90 days. The matrix of BV60S showed rapid absorption with an average reduction of 12.62% every 15 days. Regeneration was complete in group C+ and incomplete in the BV-group and C- group at 90 days. The area of new bone formation was similar between BV and C- groups at all time points. It was concluded that the porous matrix BV60S has fast resorption not being effective in the treatment of critical bone defects in the radius of dogs.