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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Burn injury : a study of the metabolic response with reference to the role of insulin-like growth factor 1 (IGF-1) and the effect of IGF-1 on a novel composite craft

Sinclair, J. S. January 1999 (has links)
No description available.
12

Avaliação do processo de incorporação dos enxertos osseos particulado e em bloco = estudos em modelo animal / Evaluation on the incorporation process of particulate and block bone grafts : studies in animal model

Chaves Netto, Henrique Duque de Miranda 15 August 2018 (has links)
Orientador: Renato Mazzonetto / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-15T07:07:58Z (GMT). No. of bitstreams: 1 ChavesNetto_HenriqueDuquedeMiranda_D.pdf: 1149047 bytes, checksum: 7a66407042b1a6d612bfca74f5a991b2 (MD5) Previous issue date: 2010 / Resumo: Desde o desenvolvimento da implantodontia, associou-se estética à função nas reabilitações, aumentando a necessidade de enxertos ósseos visando a instalação adequada destes implantes. O processo de incorporação dos enxertos geralmente é acompanhado através de análise clínica e exames de imagem. Deste modo, diversos estudos vêm sendo desenvolvidos. O presente trabalho apresenta 3 pesquisas em modelo animal, descritas nos Capítulos à seguir. CAPITULO I: Comparação histológica das diferenças existentes no processo de reparo ósseo em defeitos criados em calotas cranianas de cães, preenchidos com coágulo e enxerto ósseo autógeno particulado, a fim de se estabelecer uma classificação, defeito crítico ou não crítico, dos defeitos de 8mm de diâmetro. Observou-se, em dois períodos de sacrifício, correspondentes as fases inicial e tardia do processo de reparo ósseo, que os defeitos preenchidos com coágulo sangüíneo apresentaram um processo de reparo inferior ao grupo preenchido por enxerto ósseo autógeno, sendo este o único que apresentou aposição de tecido ósseo nos dois períodos. Deste modo, pode ser concluído que os métodos que auxiliam no processo de reparo ósseo estão indicados em casos de defeitos iguais ou maiores que 8mm, sendo este classificado como crítico. CAPITULO II: O propósito deste capítulo foi estabelecer uma relação entre os exames radiográficos e o processo de incorporação de enxertos ósseos de origem autógena, heterógena (matriz óssea bovina anorgânica) e coágulo sangüíneo, em defeitos criados em calotas cranianas de cães. Observou-se nos periodos correspondentes às fases inicial e final do processo de reparo ósseo os exames de imagem. Apesar de apresentarem-se divergentes na proservação do processo de incorporação destes enxertos, obtiveram resultados semelhantes as análises histológicas somente nos grupos de coágulo sangüíneo e enxerto ósseo de origem autógena. Deste modo, os exames radiográficos servem como parâmetro na proservação de procedimentos de reconstrução somente quando são utilizados enxertos ósseos de origem autógena, assim como casos de reparação espontânea através do coágulo sangüíneo. CAPITULO III: O objetivo deste estudo foi avaliar histológica e histométricamente a interface enxerto ósseo versus leito receptor em cães.Para tanto foram obtidos dois blocos de enxerto ósseo córtico-medular de cada cão, sendo que um destes foi fixado com a interface cortical voltada para o leito receptor, enquanto o outro foi fixado com a face medular voltada ao leito receptor. Os 6 cães foram divididos em dois períodos de sacrifício. Pode-se observar presença de tecido conjuntivo, vasos sangüíneos, tecido ósseo neoformado em ambos grupos nos dois períodos de sacrifício. A analise histométrica evidenciou que a formação de tecido ósseo neoformado foi estatisticamente semelhante em ambos grupos. Deste modo, pode-se concluir que a estrutura cortical ou medular não interferiu na formação de tecido ósseo na região de interface entre enxerto e leito receptor / Abstract: Since the implantodontology was developed, aesthetics was associated to function, increasing the requirement of bone grafting meaning the correct installation of them. The bone grafting integration process generally are accompanied thru out clinical and images exams. Thus, several studies are being developed. The present work performed 3 researches using animal model, divided in Chapters. CHAPTER I: Had the meaning to compare, thru out descriptive histological analysis, the differences that exists on bone healing in defects created in dogs calvarium, fulfilling with clot and particulate autogenous bone graft , meaning the establish a classification, such as critic or non-critic, of the 8mm diameter defects created on dogs calvarium. It was observed, on both sacrifice periods, similar to earlier and late phases of the bone healing repair, that the defects fulfilled with blood clot presented an inferior healing process when compared with the autogenous bone graft group, being this the unique that showed apposition of mineralized tissue on both periods. Thus, bone defects over 8mm can be considered critical, being necessary some method to help tissue repair, as well as, autogenous bone grafts works well when helping this regeneration process, being indicated to assist bone repair like this performed on this study. CHAPTER II: The aim of this research was to establish a relation between radiographic exams and bone grafting integration of autogenous bone graft and heterogenous bone graft (anorganic bovine bone matrix) and blood clot in defects performed on dogs calvarium. It was observed that on the correspondent periods of initial and delay phases of bone healing repair the radiographic exams. Besides presented divergent on the accompaniment of heterogenous bone graft, they obtained similar results from histological analysis on blood clot and autogenous graft groups. As concluded, radiographic tests can de used as a parameter for reconstruction proservation only when autogenous bone grafts are used, as well as in cases of spontaneous repair through blood clot. CHAPTER III: The proposal of these chapter was value, thru out histological descriptive and histometric analysis,the interface between bone graft and receipt area in dogs.To perform that, it was obtained 2 cortical-medullar bone blocks from each dog, being one fixed with the cortical face in contact to the receipt area and another fixed with the medullar face in contact to the receipt area. It was observed the presence of connective tissue, blood vessel, and mineralized tissue formation on both sacrifice periods. The histometric analyze showed that the bone tissue formation in this region was found to be statistically similar and did not influence the autogenous bone graft incorporation process / Doutorado / Cirurgia e Traumatologia Buco-Maxilo-Faciais / Doutor em Clínica Odontológica
13

Infra-inguinal arterial bypass procedures at Groote Schuur Hospital, 1977-1983 : analysis and evaluation of results

Bass, David Hyman 30 March 2017 (has links)
Infra-inguinal arterial bypass is becoming increasingly popular as a means of alleviating incapacitating symptoms of atherosclerosis and other progressive diseases affecting the arteries of the lower limb. The role of this procedure in limb salvage is controversial but an aggressive attitude is emerging from many centres. It is accepted that the majority of atherosclerotic patients have a short life expectancy but reconstructive vascular surgery has an important role to play in improving their quality of life. Progress in infra-inguinal bypass surgery has centred mainly on the development of synthetic grafts but the perfonnance of autologous saphenous vein has not been bettered in terms of longterm results and cost-effectivity. The initial experience of infra-inguinal bypass at Groote Schuur Hospital, Cape Town, is examined retrospectively with the objective of demonstrating the possible influence of patient factors and specific surgical practices on the outcome of results.
14

Surgically created, autogenous, arterial-venous grafts : light and electron microscopicchanges in the graft wall related to various angles of surgical implantation and to distal arterial stenosis /

Bond, Meredith Gene January 1974 (has links)
No description available.
15

Mechanical optimization of vascular bypass grafts

Felden, Luc. January 2005 (has links) (PDF)
Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2005. / David N. Ku, Committee Chair ; Alexander Rachev, Committee Co-Chair ; Elliot L. Chaikof, Committee Member. Includes bibliographical references.
16

Bone biomaterial interactions

Rice, Judith January 1999 (has links)
No description available.
17

Perfusion bioreactor for tissue-engineered blood vessels

Williams, Chrysanthi, January 2003 (has links) (PDF)
Thesis (Ph. D.)--School of Biomedical Engineering, Georgia Institute of Technology, 2004. Directed by Timothy M. Wick. / Vita. Includes bibliographical references (leaves 182-195).
18

Material property testing of a collagen/smooth muscle cell gel for the development of a tissue engineered vascular graft

Greer, Linda S. 05 1900 (has links)
No description available.
19

Design of a mechanism for generating axial arterial distraction in-vivo

Griffis, Jack C., III 05 1900 (has links)
No description available.
20

Matrix metalloproteinases and the engineering of a vascular construct

Johnson, Chad E. 08 1900 (has links)
No description available.

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