Longitudinal study of the presence of lactobacilli in relation to dental caries in infants and toddlers

doi:10.3877/cma.j.issn.1674-1366.2011.05.008

Abstract

Abstract:

Objective

The objective of this longitudinal study was to investigate the presence of lactobacilli in 8-32 month old children and the relationship between the presence of lactobacilli and dental caries.

Methods

Dental caries was examined and dental plaque samples were collected from 225 children of 8 month old in Xinhua Town， Huadu District of Guangzhou at baseline， and follow-ups were conducted every 6 months until they were 32 months old. Dental plaque samples were plated onto Rogosa selective media for incubation and identification of lactobacilli. Chi-square test was performed to compare the presence of lactobacilli among children with different genders， ages and dental caries status.

Results

The prevalence of lactobacilli colonization in the children examined was 12.0%， 5.6%， 11.0%， 9.3% and 21.3%， at the age of 8， 14， 20， 26， and 32 months， respectively. The prevalence at 32 months was higher than that at 14 and 26 months. There was no significant difference between boys and girls. In the children who had ever been detected with lactobacilli in baseline and the 4 times of follow-up， 72.3%were only positive in one time point. The prevalence of lactobacilli in the children with dental caries was significantly higher than that in caries-free group.

Conclusions

Lactobacilli colonized in teeth surfaces in early age， but the colonization is unstable and changes with age and the presence of caries.

Key words: Lactobacilli, Longitudinal study, Dental caries, Infant and toddler

Yan-ling WU, Yan ZHOU, Fan-ping CHENG, Huan-cai LIN. Longitudinal study of the presence of lactobacilli in relation to dental caries in infants and toddlers[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(05): 494-498.

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URL: https://zhkqyxyjzz.cma-cmc.com.cn/EN/10.3877/cma.j.issn.1674-1366.2011.05.008

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References 19

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年龄（个月）	人数	乳杆菌阳性人数（%）	χ²	P
8	225	27（12.0）	23.117	＜ 0.001
14	215	12（5.6）
20	191	21（11.0）
26	172	16（9.3）
32	155	33（21.3）

年龄（个月）	人数	乳杆菌阳性人数（%）	χ²	P
8	225	27（12.0）	23.117	＜ 0.001
14	215	12（5.6）
20	191	21（11.0）
26	172	16（9.3）
32	155	33（21.3）

年龄（个月）	患龋		无龋		χ²	P
年龄（个月）	人数	LB 阳性人数（%）	人数	LB 阳性人数（%）
20	3	3（100.0）	188	0（0）	-	0.001^a
26	19	5（26.3）	153	11（7.2）	5.236	0.022
32	44	16（36.4）	111	17（15.3）	8.330	0.004

年龄（个月）	患龋		无龋		χ²	P
年龄（个月）	人数	LB 阳性人数（%）	人数	LB 阳性人数（%）
20	3	3（100.0）	188	0（0）	-	0.001^a
26	19	5（26.3）	153	11（7.2）	5.236	0.022
32	44	16（36.4）	111	17（15.3）	8.330	0.004

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