1887

Abstract

and are known to be associated with the development of dental caries. In this study these bacteria were detected in pre-school children (each with primary dentition, age range 3–5 years, = 60) using a PCR method, and then their presence was compared with the incidence of dental caries over a 1-year period. Plaque samples were collected from all erupted tooth sites using a sterile toothbrush. Dental examinations at the beginning of the study (baseline) and after 1 year were also performed to determine decayed, missing, filled teeth (dmft) scores using WHO caries diagnostic criteria. The prevalences of and across all the subjects were 61.7 % and 56.6 %, respectively; 13 subjects (21.7 %) were positive for alone, 10 (16.6 %) were positive for alone and 24 (40.0 %) were positive for both and , whereas 13 (21.7 %) were negative for both and . dmft scores of subjects positive for both and at baseline and after 1 year were significantly higher than of those positive for alone at the same stages ( < 0.01 and < 0.001, respectively). The caries incremental increase was also significantly greater in those with both bacteria detected ( < 0.05). Our results indicate that pre-school children harbouring both and have a significantly higher incidence of dental caries than those with alone.

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2005-07-01
2019-11-19
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