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| Author(s): |
Ezilmara Leonor Rolim de Sousa
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Piracicaba, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba |
| Defense date: | 2003-02-18 |
| Examining board members: |
Caio Cezar Randi Ferraz;
Eloi Dezan Junior;
João Eduardo Gomes Filho;
Brenda Paula Figueiredo de Almeida Gomes;
Francisco José de Souza Filho
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| Advisor: | Caio Cezar Randi Ferraz |
| Abstract | |
The aim of this study was to investigate the composition of the microbiota of infected root canaIs associated with periapical abscesses, to investigate the correlation of specific species of bacteria with the clinical localization of the periapical abscesses, signs, and symptoms, and to test the susceptibility of prevalent strict anaerobic bacteria isolated. Microbiological samples were collected from 60 root canals using sterile paper points, transported in RTF and diluted, plated and incubated in an anaerobic chamber. Microbial colonies were then purified, characterized and identified by established methods. Of the 287 different bacterial species recovered, 201 were strict anaerobes or microphilic species. One or more (maximum of 14) bacterial species were recovered from 59 (98.3%) root canals, showing the polymicrobial characteristic of endodontic infections. The most frequently strict anaerobes isolated were: Peptostreptococcus prevotii (22/60), Peptostreptococcus micros (19/60), Fusobacterium necrophorum (19/60). Although less frequent, facultative bacteria such as Gemella morbillorum (19/60), Streptococcus mitis (13/60), and Streptococcus sanguis (11/60) were also found. The Pearson X 'POT. 2¿ test or Fisher's exat test showed positive relationship among some bacterial species and the localization of periapical abscesses as well as with some endodontic signs and symptoms (p<0.05). Results indicated predominance of Gram-positive anaerobic bacteria in the mixed microbiota of dental root canals associated with periapical abscesses. The E-test revealed bacterial susceptibility to benzylpenicillin, amoxicillin, amoxicillin/potassium clavulanate, clindamycin and cefaclor. All microorganisms tested did not produce 'beta¿-lactamase (AU) | |