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  • Title: [Relationship between cariogenic microbe, salivary buffer capacity and early childhood caries].
    Author: Zhou Q, Bai J, Qin M.
    Journal: Zhonghua Kou Qiang Yi Xue Za Zhi; 2007 Oct; 42(10):581-4. PubMed ID: 18215361.
    Abstract:
    OBJECTIVE: To investigate the relationship between Mutans streptococcus (MS), Lactobacilli (LB), pH value and buffer capacity of saliva and early childhood caries (ECC). METHODS: A total of 178 children aged from 42 to 54 months were recruited from 14 urban kindergartens in Beijing. The ECC group contained 87 children with more than 5 decayed teeth, and the control group was composed of 91 caries-free children. Unstimulated (UWS, 2 ml) and stimulated (SWS, 2 ml) whole saliva were collected in each subject. The pH value and buffer capacity of saliva were measured using an electro-acidimeter (+/- 0.01pH). RESULTS: MS and LB were isolated from 96.6% and 79.3% of children with ECC, which were significantly higher than those (63.7%, 27.5%) of caries-free children (P < 0.05) respectively. The counts of MS and LB in children with ECC were approximately 10 times higher than that in caries-free children. Initial pH value and buffer capacity of SWS were significantly higher than that of UWS (P < 0.001) in both groups. The pH value and buffer capacity of both UWS and SWS in ECC children were significantly higher than caries-free children (P < 0.05). There were no significant correlations between MS, LB and pH value and buffer capacity of saliva in caries-free children. Significant correlation (r = 0.249, P < 0.05) was found between the numbers of MS and buffer capacity of stimulated saliva in ECC children. CONCLUSIONS: MS and LB were important pathogens for ECC. Lower initial pH value and buffer capacity of saliva may be an important factor of ECC.
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