With the increase in the population’s life expectancy, there has also been an increase in the rate of osteoporosis, which has expanded the search for strategies to regenerate bone tissue. The ultrasonic sonochemical technique was chosen for the functionalization of the 45S5 bioglass. The samples after the sonochemical process were divided into (a) functionalized bioglass (BG) and (b) functionalized bioglass with 10% teriparatide (BGT). Isolated mesenchymal cells (hMSC) from femurs of ovariectomized rats were differentiated into osteoblasts and submitted to in vitro tests. Bilateral ovariectomy (OVX) and sham ovariectomy (Sham) surgeries were performed in fifty-five female Wistar rats. After a period of 60 days, critical bone defects of 5.0 mm were created in the calvaria of these animals. For biomechanical evaluation, critical bone defects of 3.0 mm were performed in the tibias of some of these rats. The groups were divided into the clot (control) group, the BG group, and the BGT group. After the sonochemical process, the samples showed modified chemical topographic and morphological characteristics, indicating that the surface was chemically altered by the functionalization of the particles. The cell environment was conducive to cell adhesion and differentiation, and the BG and BGT groups did not show cytotoxicity. In addition, the experimental groups exhibited characteristics of new bone formation with the presence of bone tissue in both periods, with the BGT group and the OVX group statistically differing from the other groups (p < 0.05) in both periods. Local treatment with the drug teriparatide in ovariectomized animals promoted positive effects on bone tissue, and longitudinal studies should be carried out to provide additional information on the biological performance of the mutual action between the bioglass and the release of the drug teriparatide.
Objetivo: O objetivo deste estudo foi avaliar os efeitos da irradiação gama simulando uma dose total de radioterapia convencional em câncer de cabeça e pescoço na remodelação óssea e osseointegração de implantes em fêmures de ratos.Materiais e Métodos: Sessenta ratos receberam implantes de titânio rosqueado (Ti6Al4V) em ambos os fêmures. Os animais foram divididos: Sem Irradiação (N-Ir): Grupo N-Ir com implante somente; Irradiação Precoce (E-Ir): implante + irradiação após 24h; Irradiação Tardia (L-Ir): implante + irradiação após 4 semanas e Irradiação Prévia (P-Ir): irradiação + implante após 4 semanas. A irradiação foi fracionada em duas sessões de 15 Gy cada, totalizando 30 Gy. Os animais foram sacrificados aos 3 dias, 2 e 7 semanas após o tratamento. Marcadores imuno-histoquímicos Runx2 e coloração Picrosirius red, análise histomorfométrica (BIC e BAFO) e teste de torque reverso foram utilizados para avaliar a interface implante/osso e osso circundante. Os dados de Runx-2 (%), coloração picrosirius red (%), BIC e BAFO (%) e torque reverso (N/cm) foram submetidos aos testes ANOVA e Tukey para comparação entre grupos, ambos com α=0,05.Resultados: Os resultados mostraram que a expressão de Runx-2 foi diferente nos grupos irradiados quando comparados ao grupo N-Ir. Em geral, as análises de fibras colágenas nos grupos irradiados diferiram do grupo N-Ir. Em relação ao BIC, BAFO e teste de torque reverso, o grupo L-Ir apresentou resultados semelhantes ao grupo N-Ir, enquanto os demais grupos foram prejudicados pela radioterapia.Conclusões: A radiação ionizante afetou negativamente a remodelação óssea, e seu efeito depende de quando a radioterapia é aplicada, com retardo da osseointegração quando aplicada previamente ou próximo à cirurgia.
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