A comparision of Streptococcus Mutans and Streptococcus Sobrinus infection among school children with and without dental caries in Vo Thi Sau primary school, Hai Duong city, 2021

Abstract

The descriptive cross - sectional study aims to compare the infection of Streptococcus mutans and Streptococcus sobrinus among children (grade 1 and 2) with and without caries who study at Vo Thi Sau Primary School in Hai Duong City, 2021. Methods: The study design was a comparative descriptive study. The data were collected by Hai Duong Medical Technical University odontologists. The bacterial results was performed and confirmed at the National
Institute of Hygiene and Epidemiology. Among 313 students aged from 6 to 7 years old were invited to participate in the study. Two groups of 50 students with dental caries and 50 students without dental caries were randomly selected to determine the presence of S. mutan, S. Sobrinus. Results: The prevalence of dental caries in students of grade 1 and 2 of Vo Thi Sau Primary School in Hai Duong city was 78.6%. With Polemerase Chain Reaction (PCR) technique to detect species identities, there were 41/50 positive for S. mutan (82%), 12/50 positive for S. sobrinus (24%) in dental caries group while in students without caries, S. mutan, S. sobrinus account for 14 % (7/50) and 8% (4/50), respectively. Conclusions: The bacteria S. mutan and S. sobrinus relate to the rate of tooth decay intimately, it is necessary to have interventions to change the biofilm affecting the bacteria to reduce the rate of tooth decay.