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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.
1

Aspectos Inflamatórios e Imunológicos de Pulpites Dentárias Humanas / Inflammatory and Immunological Aspects of pulpitis Human Dental

BRUNO, Kely Firmino 18 September 2009 (has links)
Made available in DSpace on 2014-07-29T15:25:25Z (GMT). No. of bitstreams: 1 Kely firmino 1.pdf: 970198 bytes, checksum: 3bf225da31dfffbda40dcadc48b3437c (MD5) Previous issue date: 2009-09-18 / Immune and inflammatory cells may contribute to host defense and microenvironmental changes during the pathogenesis of dental pulpitis. This study evaluated the microscopic characteristics and densities (per mm2) of tryptase+ mast cells, CD4+ T helper lymphocytes, CD45RO+ memory T lymphocytes, foxp3+ T regulatory lymphocytes, CD20+ B lymphocytes, CD68+ macrophages, and CD31+ blood vessels in human dental pulpitis (n = 38). Methods: Tryptase, CD4, CD45RO, foxp3, CD20, CD68, and CD31 expressions were analyzed using immunohistochemistry; other microscopic features, such as intensity of inflammatory infiltrate and collagen deposition, were evaluated after staining with hematoxylin and eosin. Results: Two microscopic patterns of dental pulpitis were found: group 1 (G1) (n = 15) showed intense inflammatory infiltrate and mild collagen deposition; conversely, group 2 (G2) (n = 23) showed scarce inflammatory infiltrate and intense collagen deposition. The numbers of CD68+ and CD20+ cells and the density of blood vessels were higher in G1 than in G2. However, there were no differences in CD4+ and CD45RO+ cell densities between groups. When present, mast cells were equally distributed in G1 and G2, whereas foxp3+ cells were detected in 58.82% and 14.28% of the samples of G1 and G2. Conclusions: Immune and inflammatory cell infiltration have different patterns in human dental pulpitis, which might reflect distinct microscopic characteristics and particular local defense capabilities. / Células imune-inflamatórias podem contribuir para defesa do hospedeiro e alterações no microambiente durante a patogênese das pulpites dentárias. O presente estudo avaliou as características microscópicas e as densidades (por mm2) de mastócitos triptase+, linfócitos T helper CD4+, linfócitos T de memória CD45RO+, linfócitos T regulatórios foxp3+, linfócitos B CD20+, macrófagos CD68+ e vasos sanguíneos CD31+ em pulpites dentárias humanas (n = 38). Métodos: Expressões de triptase, CD4, CD45RO, foxp3, CD20, CD68 e CD31 foram analisadas por imunoistoquímica; outras características microscópicas, como a intensidade de infiltrado inflamatório e colagenização, foram avaliadas após a coloração com hematoxilina e eosina. Resultados: Dois padrões microscópicos distintos de pulpites dentárias foram observados: Grupo 1 (G1) (n=15) apresentou intenso infiltrado inflamatório e pouca colagenização; o Grupo 2 (G2) (n=23) apresentou escasso infiltrado inflamatório e intensa colagenização. Os números de células CD68+ e CD20+ bem como a densidade de vasos sanguíneos foram maiores no G1 comparadas ao G2. Entretanto, não houveram diferenças nas densidade celulares de CD4+ e CD45RO+ em ambos os grupos. Quando presentes, os mastócitos estiveram igualmente distribuídos em G1 e G2, enquanto as células foxp3+ foram detectadas em 58.82% e 14.28% de G1 e G2, respectivamente. Conclusões: Tipos diferentes de infiltração celular imune-inflamatória foram identificados em pulpites dentárias humanas, as quais podem refletir padrões microscópicos distintos de respostas com capacidade particular de defesa local.

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