Primeiro relato de isolamento e identificação taxonômica de fungos filamentosos em infecções endodônticas

• Autor(a) principal: Gomes, Cinthya Cristina
• Data de Publicação: 2007
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13996
• topic: Necrotic pulp; Filament fungus; Perirradicular disease; Polpa dentária - Necrose; Fungos Isolamento; Fungos - Classificação; Doenças periapicais; Necrose pulpar; Fungos filamentosos; Lesão perirradicular; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA::ENDODONTIA

The purpose of the present study was to evaluate in vivo, with specific techniques that isolates the presence of filament fungus in the root canal of teeth with necrotic pulp and perirradicular disease, see the relationship between the presence of these fungus and patients with immunological deficiency and carry out a taxonomic study of the fungus isolated. It was fulfilled the culture of 60 root canals of teeth with necrotic pulp and perirradicular disease. The patients answered a health questionnaire and signed a term to allow the research. After the absolute isolation and cleaning the operating field the samples were collected using three sterile paper points inserted into the root canal during 1 minute. In an isolated field by two lamps, the collected materials were inoculated in a tube with Saboraud Agar with Cloranfenicol. Nearby the isolated field with lamps it was placed an opened Petri plaque with the same culture material from the tubes with the purpose to verify the perceptiveness of the isolated field (negative control). At the same time it was carried out the positive control group with an opened Petri plaque that was maintained far from the isolated fields. The tubes and the Petri plaque were maintained in atmosphere temperature during seven to fourteen days to observe micelial growth. Those that showed growth were spread on specific environment for microcultivation CYA Agar, Extract of Agar Malt or Agar potato. With the help of an optic microscope the colonies were identified in genre and species. Among the 60 samples collected, 17 showed positive culture for filament fungus, making up a total of 28,3%. The genre Aspergillus was isolated, in situ, of 7 samples (11,6%), and the species Aspergillus ustus was isolated from 3 pacients (5%). The Aspergillus granulosus, Aspergillus niger e o Aspergillus sydowii were isolated from 3 pacients respectivaly. The species Emericella quadriluniata, sexual form of Aspergillus, was isolated from 1 pacient. The genre Penicillium was isolated, in situ, from 4 samples (6,6%), where the species isolated were Penicillium implicatum, Penicilium micsynvisk, Penicillium lividum and Penicillium citrionigrum. The genre Fusarium was isolated, in situ, from 2 samples (3,3%), where the species identified were Fusarium moniliforme, Fusarium melanochorum, respectively. The species Aureobasidium pullulans, Exophiala jeancelmei, Eurotium amstelodame and Cladosporium sphaerospermum were isolated in situ from 4 samples. All the samples where it was isolated the filament fungus belonged to pacients with the imunolgical response compromised. On the Petri plaques employed at the range of the two lamp, it was not seen micelial growth. Thereby, on the positive control plaques, opened to check the contamination of the environment showed the growth of ambiental fungus that were not compatible with the fungus isolated from the root canal, and did not shor pure culture. It was concluded that root canal with necrotic pulp and periapical disease, can show positive culture for filament fungus and these results were directly related to the deficiency of the immunological response of the hostess.