• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 80
  • 52
  • 5
  • 4
  • 3
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 149
  • 52
  • 28
  • 27
  • 17
  • 16
  • 15
  • 14
  • 14
  • 14
  • 14
  • 12
  • 12
  • 10
  • 10
  • 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.
41

Orthodontic movement of teeth into artificially produced infrabony defects in the Rhesus monkey: a histological report

Geraci, Timothy Francis, Crossetti, Henry William January 1972 (has links)
Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1972. (Periodontology) / Bibliography included.
42

The effect of the hormone relaxin on the periodontal tissues

Rice, Bruce H. January 1960 (has links)
No description available.
43

A scanning electron microscopic study of the marmoset palate and periodontium microvasculature using corrosion casts /

Lee, David January 1988 (has links) (PDF)
Thesis (M.D.S.)--University of Adelaide, Dept. of Dentistry, 1989. / Includes bibliographical references (leaves 9.1-9.20).
44

The ultrastructure of blood vessels in the periodontal ligament ofhuman maxillary first premolar teeth.

Gilchrist, Donald Richard. January 1978 (has links) (PDF)
Thesis (M.D.S. 1979) from the Department of Dental Health, University of Adelaide.
45

Periodontal tissue reactions to jiggling and orthodontic forces

Ericsson, Ingvar. January 1978 (has links)
Thesis--Göteborg. / Extra t.p. with thesis statement inserted. Includes bibliographical references (p. 43-44).
46

Periodontal tissue reactions to jiggling and orthodontic forces

Ericsson, Ingvar. January 1978 (has links)
Thesis--Göteborg. / Extra t.p. with thesis statement inserted. Includes bibliographical references (p. 43-44).
47

Influencia do fator idade na modulação da resposta de celulas do ligamento periodontal induzida pelo fator de crescimento basico de fibroblastos (bFGF) / The influence of aging on the modulation of periodontal ligament cells response induced by basic fibroblast growth factor (bFGF)

Benatti, Bruno Braga 27 June 2007 (has links)
Orientador: Francisco Humberto Nociti Junior / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-09T20:03:17Z (GMT). No. of bitstreams: 1 Benatti_BrunoBraga_D.pdf: 1238620 bytes, checksum: 74ac7fb19efcf73bb7cccf8ec4f353d2 (MD5) Previous issue date: 2007 / Resumo: O objetivo deste trabalho foi investigar a influência do fator idade sobre o comportamento e expressão gênica de células do ligamento periodontal (CLPD), e quais alterações o tratamento com fator de crescimento básico de fibroblastos (bFGF) pode induzir nestas populações celulares. Culturas primárias de CLPD foram obtidas e divididas nos seguintes grupos experimentais: A ¿ inclusos (células obtidas de terceiros molares inclusos de voluntários entre 18 e 30 anos de idade), B ¿ jovens (células obtidas de pré-molares erupcionados de voluntários entre 15 e 20 anos de idade), C ¿ idosos (células obtidas de dentes erupcionados de voluntários acima de 60 anos de idade), D ¿ grupo A submetido ao tratamento com 10?g/ml de bFGF, E ¿ grupo B submetido ao tratamento com 10?g/ml de bFGF e F ¿ grupo C submetido ao tratamento com 10?g/ml de bFGF. Foram realizados ensaios de proliferação e viabilidade celular, mineralização, quantificação dos níveis de proteína total e do padrão de expressão dos seguintes genes: Colágeno tipo I e III, metaloproteinase (MMP)-2 e -8, inibidor tecidual de metaloproteinase (TIMP)-1 e ¿2, fator de crescimento derivado de plaquetas (PDGF)-1, proteína morfogenética óssea (BMP)-3, bFGF, osteoprotegerina (OPG), receptor ativador do fator nuclear kß ligante (RANKL), interleucina (IL)-1ß, IL-4, IL-6, IL-8 e receptor de fator de crescimento de fibroblasto (FGFR) 1 por meio da técnica de ¿real-time¿ PCR (PCRq). A análise dos resultados demonstrou que a idade diminuiu a taxa de proliferação celular e a formação de nódulos minerais (P<0,05), enquanto que não se observou efeito significativo da idade sobre a viabilidade celular e quantidade total de proteína secretada (P>0,05). Já na análise de expressão gênica observou-se que a idade diminuiu significativamente os níveis de RNAm para colágeno tipo I e IL-4, enquanto que para os genes FGFR1, MMP-8, TIMP-1, OPG e IL-1ß e 6, observou-se um aumento nos níveis de RNAm (P<0,05). O tratamento com 10?g/ml de bFGF aumentou a taxa proliferativa em todos os grupos (P<0,05), entretanto com menor intensidade nas células de idosos (P<0,05). Já a formação de nódulos minerais foi inibida pelo fator crescimento em todos os grupos experimentais (P<0,05), enquanto que a viabilidade celular e quantidade total de proteína secretada não foram afetadas (P>0,05). Na avaliação do padrão de expressão gênica, os resultados demostraram que o tratamento com bFGF, diminuiu nos níveis de RNAm para todos os genes (P<0,05), com excessão da TIMP-1 e IL-8 que aumentaram (P<0,05), BMP-3 que aumentou nas células de jovens e diminui nas células de idosos (P<0,05), e PDGF-1 que não foi afetada (P>0,05). Dentro dos limites do estudo, podemos concluir que: i) foi possível estabelecer culturas primárias de células do ligamento periodontal obtidas de pacientes jovens e idosos, ii) a idade pode modular propriedades importantes das CLPD, diminuindo seu potencial de regeneração de estruturas minerais além de exacerbar características pró-inflamatórias e de degradação da matriz extracelular e iii) o tratamento com 10?g/ml de bFGF induz alterações similares no comportarmento de CLPD independentemente da idade do doador / Abstract: The aim of this study was to investigate the effect of aging on periodontal ligament cells (PDLC), modulated by the treatment with bFGF. Primary periodontal ligament cell cultures were obtained and divided into the following experimental groups: A ¿ impacted (cells from impacted molars from subjects aged 18 to 30 years), B ¿ young (cells from erupted pre-molars from subjects aged 15 to 20 years), C ¿ aged (cells from erupted teeth from patients aged more than 60 years), D ¿ group A treated with 10?g/ml of bFGF, E ¿ group B treated with 10?g/ml of bFGF and F ¿ group C treated with 10?g/ml of bFGF. For all groups, we performed proliferation and cell viability assays, mineralization assay, total protein quantification and assessed mRNA levels of: type I and III collagen, MMP-2 e -8, TIMP-1 e ¿2, PDGF-1, BMP-3, bFGF, OPG, RANKL, IL-1, IL-4, IL-6, IL-8 and FGFR 1 utlizing the ¿real-time¿ PCR technique. Data analysis demonstrated that aging negatively influenced cell proliferation and mineral nodule formation (P<0.05), while cell viability and total protein secretion were not affected (P>0.05). Gene expression analysis revealed that aging decreased mRNA levels of collagen type I and IL-4, and increased mRNA levels of FGFR1, MMP-8, TIMP-1, OPG and IL-1 and 6 (P<0.05). Treatment with 10?g/ml of bFGF significantly increased cell proliferation for all groups (P<0.05), however with a less impact on aged cells (P<0.05). In addition, cell viability and total protein secretion were not affected by bFGF (P>0.05), while mineral nodule formation was significantly inhibited (P<0.05). Finally, gene expression analysis demonstrated that bFGF decreased mRNA levels of all genes (P<0.05), except for TIMP-1 and IL-8 that were increased (P<0.05), PDGF-1 that was not affected (P>0.05) and BMP-3 that was increased in young cells and decreased in aged cells (P<0.05). Within the limits of our study, we may conclude that: i) it was possible to esblish primary cultures of PDLC obtained from young and aged donors, ii) aging modulates important features of periodontal ligament cells (PDLC), decreasing the potential for regeneration of mineralized tissues and favoring a pro-inflammatory and degenerative profile and iii) treatment with 10?g/ml of bFGF leads to similar PDLC behavioral alterations despite of the donor age / Doutorado / Periodontia / Doutor em Clínica Odontológica
48

Influencia da inalação da fumaça e da administração da nicotina sobre a regeneração periodontal espontanea : estudo histologico em ratos / The influence of cigarette smoke inhalation and nicotine administration on spontaneous periodontal regeneration: a histologic study in rats

Benatti, Bruno Braga 22 February 2005 (has links)
Orientadores: Francisco Humberto Nociti Junior, Marcio Zaffalon Casati / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-04T04:59:57Z (GMT). No. of bitstreams: 1 Benatti_BrunoBraga_M.pdf: 1301052 bytes, checksum: 1ccadb0982e68f824ce04b017e4ce35d (MD5) Previous issue date: 2005 / Resumo: Tem sido relatado que o consumo de cigarros influencia negativamente a cicatrização periodontal após procedimentos terapêuticos. Entretanto, existe pouca informação em relação à influência da inalação da fumaça de cigarro e da administração de nicotina sobre a regeneração periodontal espontânea. Sendo assim, o objetivo deste estudo foi avaliar histologicamente em ratos, o impacto da inalação da fumaça de cigarro e da administração de nicotina num modelo de reparo periodontal espontâneo. Foram utilizados neste estudo, 39 ratos adultos (Rattus Norvegicus, Albinus, Wistar), todos originários do centro de bioterismo da UNICAMP. Os animais foram divididos aleatoriamente em 3 grupos experimentais: Grupo 1 ¿ controle (n=13), Grupo 2 ¿ administração subcutânea de nicotina (3mg/kg), 3 vezes ao dia (n=13) e Grupo 3 ¿ exposição à fumaça de cigarro, 3 vezes ao dia (n=13). Trinta dias após o início dos regimes, sob anestesia geral, foi criado um defeito do tipo fenestração (King et al., 1997 modificado), tendo como dimensões 4mm de comprimento, 3mm de altura e 1mm de profundidade, com o objetivo de expor a região vestibular da raiz distal dos primeiros molares inferiores, e proporcionar a remoção do cemento dental. Os animais foram sacrificados 21 dias após a criação dos defeitos. Os resultados foram avaliados histometricamente para os seguintes parâmetros: extensão do defeito remanescente, porcentagem de preenchimento do defeito, densidade do novo osso e extensão de novo cemento. A análise intergrupo demonstrou que os defeitos tinham tamanho similar inicialmente, e que a exposição a fumaça de cigarro reduziu significativamente (P=0.05) a densidade do novo osso (80.07+3.45%, 76.37+5.27%, 72.74+6.24%, grupos 1, 2 e 3; respectivamente) e o preenchimento do defeito (95.97+4.64%, 90.62+4.64%, 85.34+7.70%, grupos 1, 2 e 3; respectivamente). Não ocorreu a formação de novo cemento em nenhum dos grupos experimentais. Dentro dos limites deste estudo, a análise dos dados nos permite concluir que a fumaça de cigarro pode influenciar negativamente a regeneração periodontal espontânea em ratos / Abstract: Cigarette smoking has been shown to negatively influence healing following periodontal therapeutic procedures. However, limited information is available on the effect of cigarette smoking on periodontal self-healing capacity in sites not previously exposed to contaminants. Therefore, the aim of this study was to histologically evaluate in rats, the impact of cigarette smoke inhalation and nicotine administration on a spontaneous periodontal healing model. Thirty nine male adult Wistar rats were used, and randomly assigned to one of the following groups: Group 1- control (n=13), Group 2- subcutaneous nicotine administration (NA) (3mg/Kg) (n=13), and Group 3- cigarette smoke inhalation (CSI) (n=13). Thirty days after the beginning of CSI and NA regimens; periodontal fenestration defects (4x3x1mm) were created at the buccal aspect of the distal root of first mandibular molars, and the animals sacrificed 21 days after surgery. The percentage of bone fill and density of new formed bone, new cementum formation, and extension of the remaining defect were histometrically obtained. Intergroup analysis demonstrated that the defects were initially similar in size, and that CSI significantly reduced (P=0.05) density of the newly formed bone (80.07+3.45%, 76.37+5.27%, 72.74+6.24%, for group 1, 2 and 3; respectively) and bone filling (95.97+4.64%, 90.62+4.64%, 85.34+7.70%, for group 1, 2 and 3; respectively). No new cementum was formed along the root surface in the above groups. Within the limits of the present study, data analysis suggests that smoking may influence the self-healing capacity of periodontal tissues regardless previous exposure to dental biofilm / Mestrado / Periodontia / Doutor em Clínica Odontológica
49

The effects of apical modification on the vitality of replanted permanent monkey teeth

Walsh, John Senan, 1951- January 1977 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / A study was conducted on the effects in a rhesus monkey of increasing the surface area of pulpal tissue available for revascularisation and regeneration of nerves after replantation of permanent teeth. Four teeth were replanted and used for controls, including two with incomplete apical development. Twelve teeth with completed apical development were replanted immediately after apical modification to increase the surface area of exposed pulp. The technique consisted of creating a facial and lingual groove in the apical region and exposing additional pulpal tissue. Radiographs were taken periodically and the replanted teeth were stable during the study period. The monkey was sacrificed after 93 days. The first hypothesis, that the apically modified teeth would sustain a healthy periodontium clinically for a period of ninety days, was disproved. Histological sections of the teeth and their supporting tissues showed varying amounts of root resorption and ankylosis. All of the apically modified teeth showed pulp necrosis, while three of the four control teeth had reestablished blood and vascular supplies and appeared vital. Ingrowth of granulation tissue was seen in the replanted teeth with pulp necrosis including one control tooth which had failed to revascularize. The second hypothesis, that the apically modified teeth would demonstrate significantly more apical revascularisation and nerve regeneration than the control teeth, was also disproved. In conclusion, the apical modification technique as performed to increase the area available for regeneration of nerves and vessels was not a success. As expected, however, immediate replantation of avulsed teeth resulted in reestablishment of periodontal membrane attachments.
50

Human periodontal mechanoreceptors : functional properties and role in jaw motor control /

Johnsen, Skjalg E., January 2005 (has links)
Diss. (sammanfattning) Stockholm : Karolinska institutet, 2005. / Härtill 4 uppsatser.

Page generated in 0.0513 seconds