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ECPB 2013, 62(2): 75–80
Clinical physiology and biochemistry

Microflora of the dental plaque in preschool children with teeth damaged by caries


Due to the data 246 isolates of bacteria in children of the control group were obtained. Among all the bacteria lactobacilli prevailed – 56 isolates (22,76±4,87%), 55 isolates (22,36±4,84%) of nonhemolytic streptococci, 54 isolates of neisseria (21,95±4,81%), and 45 isolates (18,29±4,49%) among -hemolytic streptococci. Other bacteria types were detected in small amount: coagulase negative staphylococci – 24 isolates (9,76±3,45%), -hemolytic streptococci – 7 isolates (2,85±0,64%) and 5 isolates (2,03±0,55%) S. aureus. There were identified 262 isolates of bacteria in children with teeth damaged by caries.

Among them more frequently were detected: nonhemolytic streptococci – 58 isolates (22,14±5,19%) and -hemolytic streptococci – 57 isolates (21,76±5,16%), lactobacilli – 56 isolates (21,37±5,12%). There were detected 30 and 29 isolates (11,45±3,98% ³ 11,07±3,92%) of neisseria and coagulase negative staphylococci.

Other types of bacteria were detected in small amount. Thus, 11 isolates of -hemolytic streptococci (4,2±0,84%), 10 isolates of S. aureus (3,82±0,8%), 6 isolates of escherichia (2,29±0,62%), klebsiella and pseudomonas 3 and 2 isolates (1,14±0,44% and ±0,36%) were identified.

Depending on caries activity was identified that the I degree of caries activity in comparison to III degree of caries activity was characterized by increasing of -hemolytic streptococci (6,49±2,78% and 8,02±2,47%), nonhemolytic streptococci (6,78±2,86% and 8,02±2,47%) and S. àreus (0,76±0,33 and 1,53±1,22%). Such types of microorganisms as lactobacilli, -hemolytic streptococci, neisseria were identified almost in equal amount in children with different degree of caries activity. But escherichia, klebsiella and pseudomonas were detected only in children with II and III degree of caries activity.

An amount of neisseria discharge among children with intact teeth on average was larger (67,57±5,41% and 46,88±6,24%) (ð<0,02) in comparison to the group of children with caries teeth. However, -hemolytic streptococci (89,06±3,90% and 60,81±5,64%) (ð<0,001), nonhemolytic streptococci (90,63±3,64% and 74,32±5,04%) (ð<0,001), -hemolytic streptococci (17,19±4,72% and 9,46±3,38%) (ð>0,05), S. àureus (15,63±4,54% and 6,76±2,90%) (ð>0,05) and also coagulase negative staphylococci predominated among children with affected teeth.

Such bacteria as escherichia, klebsiella and pseudomonas were identified only in children with primary teeth caries.

Thus, such types of microorganisms as -hemolytic streptococci, pathogenic species cocci (-hemolytic streptococci and S. aureus) and coagulase negative staphylococci were detected more frequently among children with teeth damaged by caries. But among children with intact teeth predominated lactobacilli and gram-negative cocci family neisseria. However, gram-negative rods (escherichia, klebsiella and pseudomonas) occurred only among children with affected teeth and on the II and III degrees of caries activity, the presence of which indicates violation of oral microbiocenosis. With age, number of children with persistent biocenisis of bacteria, which are cariogenic, increases. The percentage of persons with cariogenic bacteria group was detected higher among children with primary teeth caries.

Keywords: microorganisms, dental plaque, children, caries

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