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. 2021 Jan 13;16(1):e0245345.
doi: 10.1371/journal.pone.0245345. eCollection 2021.

Caries prevalence of the first permanent molars in 6-8 years old children

Fudong Zhu  1   2 , Yao Chen  1   2 , Yunxian Yu  3 , Yanyi Xie  1   2 , Haihua Zhu  1   2 , Huiming Wang  1   2
Affiliations

Caries prevalence of the first permanent molars in 6-8 years old children

Fudong Zhu et al. PLoS One. .

Abstract

Dental caries is one of the most common infectious diseases affecting 6-8-year-old children, especially their first permanent molars (FPMs). This study explored the prevalence of dental caries on FPMs by analyzing the oral health status of 1,423,720 children aged 6-8 years in Zhejiang Province, China. The data were extracted from the dental electronic records of the schoolchildren attending the Oral Health Promotion Project (OHPP), conducted during 2013-2017 in Zhejiang Province. Multiple logistic regression models were used to determine the factors affecting dental caries. Boys and girls accounted for 53.2% and 46.8% of the subjects, respectively. From 2013 to 2017, the prevalence of dental caries on FPMs increased: 2013: 20.4%; 2014: 25.3%; 2015: 24.5%; 2016: 27.0%; and 2017: 29.0%, despite the OHPP conducted. Based on multiple logistic regression model, girls had a significantly higher risk of FPM caries compared to boys (OR = 1.38, 95% CI: 1.37-1.39, p < 0.0001); compared with the caries rates in urban areas, the caries risk was significantly higher in rural areas (OR = 1.15, 95% CI: 1.14-1.16, p < 0.0001). In terms of geographic location in Zhejiang Province, the odds ratios of the caries risk of the east, south, west, and north were 1.35 (1.33-1.36), 1.3 (1.28-1.31), 0.81 (0.8-0.83), and 0.82 (0.81-0.84), respectively (p < 0.0001), by considering the central region as a reference. The caries prevalence of FPMs was high, with an increasing tendency and gender, social, cultural, and environmental factors affecting the caries prevalence.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Prevalence of caries in the urban and rural area.
Fig 2
Fig 2. Prevalence of caries in boys and girls.
Fig 3
Fig 3. Prevalence of caries from 2013 to 2017.
Fig 4
Fig 4. Prevalence of caries from different regions.
See this image and copyright information in PMC

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