Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
Oral medicineInfluence of oral hygiene in patients with fixed appliances in the oral carriage of antimicrobial-resistant Escherichia coli and Enterococcus isolates
Section snippets
Patients
Oral samples of 46 patients (range of age 13-55 years, 29 male and 17 female), who attended a clinic of dental medicine in northern Portugal for routine revisions of fixed appliances, were recovered during July to October 2007. A detailed medical and dental history was obtained from each patient, and those who had received antibiotics during the preceding 3 months or those who presented a clinical condition that could affect the oral microbiota (e.g., immunosuppression, diabetes mellitus, and
Results
Enterococcus spp. or E. coli isolates were recovered from 9 of the 46 oral samples of patients with fixed appliances (19.5%), and the following bacteria were obtained: E. faecium, 5 patients; E. faecalis, 2 patients; E. faecalis plus E. coli, 1 patient; E. coli, 1 patient. Poor oral hygiene was evident in these 9 patients. Enterococci and E. coli were not detected in any of the oral samples of the 55 healthy volunteers (with no fixed appliances) included in this study.
Table I shows the
Discussion
In the last decade, several studies have focused on the relationship between periodontal diseases, oral bacteria, and systemic diseases.37 Likewise, bacterial pathogens that cause medically important diseases may occasionally colonize the oral cavity.38 The present investigation analyzed the consequences of poor or improper oral hygiene in patients with fixed appliances on the carriage of E. coli and enterococci in the oral cavity. Almost 20% of the patients with fixed appliances and poor or
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Analysis of genetic lineages and their correlation with virulence genes in Enterococcus faecalis clinical isolates from root canal and systemic infections
2013, Journal of EndodonticsCitation Excerpt :In contrast, no vancomycin resistance gene was present in any strain of endodontic origin, and only 1 isolate carried the gene conferring high-level gentamicin resistance, which is in agreement with previous reports on oral E. faecalis isolates (16, 32, 33). However, the present study observed a high prevalence of ermB and tetM genes in endodontic isolates, which agrees with previous findings showing that oral E. faecalis might represent a reservoir of resistance to tetracycline and erythromycin (16, 32–34). This study demonstrated that there are major genetic differences between the E. faecalis isolates from root canal infections and those from hospitalized patients, especially in MLST genes, capsule operon polymorphisms, PAI content, and antibiotic resistance determinants.
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Supported in part by Acções Integradas Luso-Espanholas (E-110/06, HP2005-0052).