Biotipos de Streptococcus grupo mutans e avaliação de parametros clinicos e microbiologicos entre escolares de diferentes classes socio-economicas

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

Saliva samples from students aged 6 to 8 years were analysed in order to determine the prevalence of mutans streptococci serotypes and to correlate this microbiological para meter to dmfs/DMFS. Two hundred children were examined according to WHO criteria for dmfs/DMFS index, distributed in five socio-economic levels (A to E). Stimulated saliva samples were evaluated as to secretion rate, buffer capacity and pH; afier dilution the secretion was inoculated in~o the S820 culture media and the colony forming units per ml of saliva of mutans streptococci and Lactobacillus were determined. Representative colonies were isolated and classified by biochemical methods on the basis of carbohydrate fermentation. Seventy eight percent of the 491 samples tested were colonies of S. mutans, followed by S. sobrinus (11,61 %), S. rattus ( 4,69%), S. mutans V (2,65 %), S. cricetus (1,83%) and S. ferus (1,22%). The predominance of S. mutans was found in every socio-economic leveI. Among individuais harboring multiple species, the most frequent association detected was S. mutans / S. sobrinus (17%). A significative part of the population, particularly among the lower socio economic levei (D/E) was considered a high risk group in developing dental carie because of the high number of Streptococcus group mutans and Lactobacillus and high levels of dental caries index. The results also showed that among ali the parameters employed to identify such high risk populations, only dmfs showed statistical significance for every socio economic leveI

ASSUNTO(S)

bacteria odontologia preventiva saliva - exame caries dentarias

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