66 resultados para norbornane scaffold


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AimThe aim of this study was to evaluate the healing of autologous bone block grafts or deproteinized bovine bone mineral (DBBM) block grafts applied concomitantly with collagen membranes for horizontal alveolar ridge augmentation.Material and methodsIn six Labrador dogs, molars were extracted bilaterally, the buccal bony wall was removed, and a buccal box-shaped defect created. After 3months, a bony block graft was harvested from the right ascending ramus of the mandible and reduced to a standardized size. A DBBM block was tailored to similar dimensions. The two blocks were secured with screws onto the buccal wall of the defects in the right and left sides of the mandible, respectively. Resorbable membranes were applied at both sides, and the flaps sutured. After 3months, one implant was installed in each side of the mandible, in the interface between grafts and parent bone. After 3months, biopsies were harvested and ground sections prepared to reveal a 6-month healing period of the grafts.Results776.2% and 5.9 +/- 7.5% of vital mineralized bone were found at the autologous bone and DBBM block graft sites, respectively. Moreover, at the DBBM site, 63 +/- 11.7% of connective tissue and 31 +/- 15.5% of DBBM occupied the area analyzed. Only 0.2 +/- 0.4% of DBBM was found in contact with newly formed bone. The horizontal loss was in a mean range of 0.9-1.8mm, and 0.3-0.8mm, at the autologous bone and DBBM block graft sites, respectively.ConclusionsAutologous bone grafts were vital and integrated to the parent bone after 6months of healing. In contrast, DBBM grafts were embedded into connective tissue, and only a limited amount of bone was found inside the scaffold of the biomaterial.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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A presente invenção descreve um arcabouço (scaffold) tridimensional biodegradável de fibrina, formado por uma serinoprotease extraída a partir de veneno de serpente, um crioprecipitado rico em fibrinogênio extraído de bubalinos, o diluente cloreto de cálcio e uma solução de uma população de células tronco. O arcabouço é apropriado para suportar uma população de 106 células por mL de fibrina por um período prolongado de tempo, em que as células tronco são mesenquimais, de tecido umbilical e células tronco mononucleares. A invenção descreve, ainda, o processo de obtenção do arcabouço, cujos componentes são providos separadamente e polimerizam-se in situ após mistura. O arcabouço descrito apresenta inúmeras aplicações médicas, podendo aumentar a vascularização, a quimiotaxia celular, a regeneração nervosa e/ou a cicatrização de feridas no local da administração. Devido à sua origem animal, não há o risco de transmitir doenças infecciosas.