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Newly Formed Bone in Mandible Decortication Experimental Model Using rhBMP-2 Evaluated by Densitometric Study International Journal of Morphology
Issa,João Paulo Mardegan; Tiossi,Rodrigo; Watanabe,Plauto Christopher Aranha; Siéssere,Selma; Regalo,Simone Cecílio Hallak; Lopes,Ruberval Armando; Di Matteo,Miguel Angel Sala; Iyomasa,Mamie Mizusaki; Defino,Helton Luiz Aparecido.
The purpose of this study was to evaluate the newly formed bone, comparing two different carriers for rhBMP-2, using the decortication and nondecorticatication surgical technique in Wistar rat mandibles, evaluated by radiographic densitometry method. It was used fifty six animals according to specific treatment, which were sacrificed after 3 and 6 weeks after this. It was concluded that the decortication surgical technique was able to optimize the osteoinduction properties of the rhBMP-2, independently of the material carrier used and the period of time, according to radiographic densitometry technique.
Tipo: Journal article Palavras-chave: Radiography; Densitometry; Mandible; RhBMP-2; Bone.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100014
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Biochemical Analysis by Calcium Determination on the Newly Formed Bone in Critical Bone Defects Submitted to Different Treatments: A Pilot Study International Journal of Morphology
Issa,Joao Paulo Mardegan; Petenusci,Sergio Olavo; Siéssere,Selma; Regalo,Simone Cecilio Hallak; Lopes,Ruberval Armando; Di Matteo,Miguel Ángel Sala; Iyomasa,Mamie Mizusaki; Defino,Helton Luiz Aparecido.
The aim of this study was to evaluate the calcium dosage of the newly formed bone, in critical bone defects created on the calvarial tissue and filled by different substances, in male Wistar rats. A cylindrical critical bone defect (6x2mm) was created in the posterior portion, left side, on the calvarial bone in nine animals and filled with: animals' coagulum, monoolein gel, poloxamer gel, monoolein gel + 1µg rhBMP-2, monoolein gel + 3µg rhBMP-2, monoolein gel + 7µg rhBMP-2, poloxamer gel + 1µg rhBMP-2, poloxamer gel + 3µg rhBMP-2, poloxamer gel + 7µg rhBMP-2. The results of this study showed a positive correlation between the calcium dosage analysis and the newly formed bone
Tipo: Journal article Palavras-chave: Bone repair; Biomaterials; RhBMP-2; Carriers; Calcium.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000300006
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Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method International Journal of Morphology
Macedo,Ana Paula; Issa,João Paulo Mardegan; Defino,Helton Luiz Aparecido; Shimano,Antonio Carlos.
The objective of the present study was to validate virtual models for the study of dual core and cylindrical screws and evaluate the influence of the geometry of the screws on the mechanical behavior and anchoring. Two models of dual core screws were used, one with a double thread and the other with a single thread, both with a conventional cylindrical screw were used in this study. The stiffness was assessed in a pullout test using polyurethane. Three dimensional virtual models simulating the pullout test were created for finite element analysis. To validate the models, the results were correlated with the mechanical tests. Tensions generated in polyurethane and the screw were studied while simulating the application of force in the direction of the screw...
Tipo: Journal article Palavras-chave: Bone screws; Spine fixation devices; Finite element analysis.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100050
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