Bone defect repair on the alveolar wall of the maxillary sinus using collagen membranes and temporal fascia: an experimental study in monkeys

Few studies has been done using guided bone regeneration in maxillary sinus defects. AIM: To assess the bone repair process in surgical defects on the alveolar wall of the monkey maxillary sinus, which communicates with the sinus cavity, by using collagen membranes: Gen-derm - Genius Baumer, Pro-tape - Proline and autologous temporal fascia. MATERIALS AND METHODS: In this prospective and experimental study, orosinusal communications were performed in four tufted capuchin monkeys (Cebus apella) and histologic analysis was carried out 180 days after. RESULTS: In the defects without a cover (control), bone proliferation predominated in two animals and fibrous connective tissue predominated in the other two. In defects repaired with a temporal fascia flap, fibrous connective tissue predominated in three animals and bone proliferation predominated in one. In the defects repaired with Gen-derm or Pro-tape collagen membranes there was complete bone proliferation in three animals and fibrous connective tissue in one. CONCLUSIONS: Surgical defect can be repaired with both bone tissue and fibrous connective tissue in all study groups; collagen membranes was more beneficial in the bone repair process than temporal fascia or absence of a barrier.

Reconstrução de maxila severamente atrófica via enxerto ósseo autógeno de calota craniana: descrição de técnica

Bone reconstructions are traditionally conducted with autogenous grafts harvested from intra- or extra-oral donor sites to reestablish the lost bone volume for further implant-prosthetic rehabilitation. The calvarial bone has been studied as an excellent donor site in large atrophic situations, presenting low resorption rates, as well as complications and minimal morbidity. The hospitalization time is short, with low pain levels, short functional limitations, and invisible scars. The skull microarchitecture is predominantly cortical in the presence of growth factors that demonstrate their osteogenic, osteoinductive, and osteoconductive abilities resulting in low resorption rate and high predictability when compared to the iliac crest. Dural lacerations, extra and subdural bleeding, cerebrospinal fluid leakage, and brain damage have been minimized due to the development of surgical technique. The delimitation of diploe, preserving the internal skull cortex before osteotomy at the donor made it possible to reduce accidents and complications. The aim of this paper is to show a technical and to discuss aspects of the use of calvarial bone in the reconstruction of severely atrophic maxilla for oral rehabilitation with osseointegrated implants.

Contribuições da reconstrução racional didática no desenvolvimento de concepções epistemologicamente mais aceitáveis sobre a natureza da ciência e do progresso científico

This study inserts itself in the research line conceptions on the nature of the science (CNC) in the school atmosphere. More specifically, on that teacher of natural sciences who claims not to be interested in philosophy, it is usually noticed a tendency to understand and to teach a vision of a ready/ finished and unalterable science, which directly influences the students conception of science. Discussed here is the application of a didactic rational reconstruction in high school, the results of which are compatible with a more epistemologically acceptable educational concep tion on the nature of science as something provisory, variable and controversial.

Efeitos do pneumoperitônio e de uma manobra de recrutamento alveolar seguida por pressão positiva no final da expiração na função cardiopulmonar em ovinos anestesiados com isoflurano e fentanil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência do comprimento do parafuso nas propriedades biomecânicas da placa de reconstrução bloqueada

Pós-graduação em Biotecnologia Animal - FMVZ