498 resultados para osso


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The correction of bone defects is the restoration of lost structures which can be replaced by alloplastic implants or bone grafts. Due to the known disadvantages of removal of autogenous grafts, most researches in dentistry aim to develop alloplastic or non-alloplastic materials able to replace bone without these limitations. Beta-Tricalcium Phosphate (β-TCP) is a synthetic granular bone substitute, biocompatible, osteoconductive, which can be used in the alveolar reconstruction. In this work, we perform a literature review on the β-TCP characteristics and discuss its application in dentistry.

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The use of bone grafts from bone tissue banks, also known as bone allografts, has increased in the last years, although most of its users still have concerns on resources and processing protocols. The objective of this paper was to make a literature review about the use of bone allografts in Dentistry, and also about the legal considerations regarding this biomaterial. Studies regarding the donor selection, the cross-infection risks and processing protocols of this biomaterial are still rare but essential, and allied to those regarding its clinical application, can base its use.

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This report shows the resolution of a case study whose aim was promote the aesthetic and functional rehabilitation of upper left hemi-arch over endosseous and needle implant prostheses. To improve the position of the needle implants, we performed the bucco-palatal bending of needles splinting them with composite resin; we removed the screwed implant prosthesis in the regions of the premolars (24 and 25) and molar (26). The mini-abutments of the last two implants were replaced, and in the first premolar and canine, we used cemented abutments due to implant angulation having planned soldering because of implant size and contact with one needle implant that could interfere with intimate contact bone/implant damaging biomechanics. Pick-up impressions were performed with an open tray, using a retractor cord in the needle implants and respective transfer copings. Therefore, models were related on semi-adjustable articulator after a face-bow recording and interocclusal indexes. After working cast fabrication and try-in of infra-structures, these were adjusted and related into the articulator again. Then, after ceramic build-up, adjustments, finishing, and torque, chemically-activated resin cement was applied on units 21 to 24. At the end of the case, we concluded that a good aesthetic and functional rehabilitation depends on thorough knowledge of techniques for each clinical situation.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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As fraturas de rádio e ulna em animais de companhia são ocorrências ortopédicas de grande incidência em Medicina Veterinária. Cães de pequeno porte parecem ter uma maior incidência de fraturas em terço distal do rádio e ulna. A consolidação de ossos fraturados baseia-se na redução anatômica ou na aproximação dos maiores fragmentos. Para haver uma correta cicatrização óssea, os implantes ortopédicos devem anular todas as forças atuantes no foco de fratura. O tratamento dessas fraturas é descrito como difícil, em porte do tipo toy e miniatura. A ocorrência da não consolidação óssea é alta chegando a 60% dos casos estudados. Alguns fatores identificados afetam a osteossíntese em cães de raças de pequeno porte, pois são inerentes à instabilidade biomecânica, como, o mínimo contato da superfície do osso após a redução, devido ao pequeno diâmetro existente, diminuição da cobertura de tecido mole, formação constante de cartilagem no foco da fratura, e diminuição da densidade vascular na junção diáfise-metafisária distal em comparação com cães de raças de grande porte. O objetivo da presente revisão sistemática foi avaliar o melhor método de tratamento para fraturas distais de rádio e/ou ulna em cães de raças de pequeno porte. Como metodologia foram utilizados 14 artigos científicos, sendo 11 internacionais e quatro nacionais. A aplicação de placas, nesse estudo sistemático, foi considerado o método mais eficaz para fixação de fraturas distais de rádio e ulna em cães de pequeno porte

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

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

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In horses less than one year of age fractures of the third metacarpal bone (McIII) or metatarsal bone III (MtIII) are mainly attributed to trauma. Open reduction and internal fixation are the most common treatment method. A Quarter Horse filly with three months of age, which weighed 150kg presented a diaphyseal multifragmentar wedge fracture of right MtIII which was treated with transcortical pins and cast, associated with intralesional application of platelet rich plasma (PRP). After two years of surgery, the animal initiated a training program for racing, and six months later, the patient ran its first official match. The choice of therapeutic methods for treating fractures in horses should be one that provides an earlier repair and minor possibility of complications. Thus, the therapy association which was adopted was considered favorable, since allowed full reestablishment of locomotion of the patient and made possible its return to race.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)