Resumo

PERRONE, Marianella et al. Dental plaques as Helicobacter pylori reservoirs. Rev. Soc. Ven. Microbiol. [online]. 2007, vol.27, n.2, pp.95-99. ISSN 1315-2556.

Abstract Dental plaques have been proposed as Helicobacter pylori reservoirs, suggesting that the oral microenvironment can be a permanent niche for the bacterium. The objective of this study was to determine the role played by the dental plaque as reservoir for this species, evaluating the presence of H. pylori DNA in dental plaques and gastric biopsies through the polymerase chain reaction (PCR). The evaluation included seventy-one gastro-intestinal symptomatic patients referred for endoscopic examination by the Gastroenterology Service of the Caracas University Hospital, as well as 40 asymptomatic subjects. The dental plaque samples were analyzed by PCR based on the ure c gene sequence. Gastric biopsies were taken for histopathological analysis and PCR. H. pylori was detected in 48 (68%) gastric biopsies from the 71 patients, all with chronic gastritis, and in the dental plaque of 13 (18%) of the same 71 patients. In 8 (17%) of these 48 patients H. pylori was also detected in dental plaque. Four of these patients also presented displasia and metaplasia. Three patients from the control group were PCR positive for H. pylori in dental plaque. Dental plaques can be a reservoir for these bacteria and their presence could represent a risk factor for gastrointestinal re-infection after treatment for eradicating this bacterium

Palavras-chave : Helicobacter pylori; dental plaque; bucal cavit.