Modified Basic Erosive Wear Examination (BEWE) index.

<p>Modified Basic Erosive Wear Examination (BEWE) index.</p

The relationship between dentin exposure and associated factors among the study population.

<p>The relationship between dentin exposure and associated factors among the study population.</p

Schematic illustration of multistage sampling.

<p>Schematic illustration of multistage sampling.</p

The relationship between tooth wear and associated factors among the study population.

<p>The relationship between tooth wear and associated factors among the study population.</p

Additional file 1 of Prevalence and relevant factors of halitosis in Chinese subjects: a clinical research

The self-administered questionnaire for this study. (DOCX 17 kb

Binary logistic regression analyses of odds for tooth wear among Chinese adults.

<p>Binary logistic regression analyses of odds for tooth wear among Chinese adults.</p

Prevalence and Indicators of Tooth Wear among Chinese Adults

<div><p>Numerous epidemiological studies have focused on the prevalence and related indicators of tooth wear. However, no sufficient studies have been conducted with Chinese adults. The purpose of this study was to assess the prevalence of tooth wear and identify related indicators among adults aged 36 to 74 years in Wuhan City, P.R. China. A cross-sectional and analytic study was conducted with 720 participants, aged 35–49 yrs and 50–74 yrs, in 2014. Each age group included 360 participants, of which 50% were males and 50% were females. All participants completed a questionnaire before examination. Tooth wear was assessed using the modified Basic Erosive Wear Examination (BEWE) index. The data were analyzed using the chi-square test and binary logistic regression analysis. The prevalence of tooth wear was 67.5% and 100% in the 35–49 and 50–74 age groups, respectively. The prevalence of dentin exposure was 64.7% and 98.3%, respectively. A significantly higher prevalence of tooth wear and dentin exposure was found in the 50–74 yr group than in the 35–49 yr group (p < 0.05). Critical indicators of tooth wear and dentin exposure included high frequency of acidic drinks and foods consumption, low socio-economic status, and unilateral chewing. The frequency of changing toothbrushes and the habit of drinking water during meals were associated with tooth wear. In addition, the usage of hard-bristle toothbrushes and consuming vitamin C and aspirin were found to be linked with dentin exposure. In conclusion, the prevalence of tooth wear and dentin exposure observed in Chinese adults was high, and the results revealed an association between tooth wear and socio-behavioral risk indicators.</p></div

Binary logistic regression analyses of odds for dentin exposure among Chinese adults.

<p>Binary logistic regression analyses of odds for dentin exposure among Chinese adults.</p

The prevalence of tooth wear and dentin exposure according to gender and age in Wuhan, China.

<p>The prevalence of tooth wear and dentin exposure according to gender and age in Wuhan, China.</p

Pyrosequencing of Plaque Microflora In Twin Children with Discordant Caries Phenotypes

<div><p>Despite recent successes in the control of dental caries, the mechanism of caries development remains unclear. To investigate the causes of dental decay, especially in early childhood caries, the supragingival microflora composition of 20 twins with discordant caries phenotypes were analyzed using high-throughput pyrosequencing. In addition, the parents completed a lifestyle questionnaire. A total of 228,789 sequencing reads revealed 10 phyla, 84 genera, and 155 species of microflora, the relative abundances of these strains varied dramatically among the children, Comparative analysis between groups revealed that <i>Veillonella</i>, <i>Corynebacterium</i> and <i>Actinomyces</i> were presumed to be caries-related genera, <i>Fusobacterium</i>, <i>Kingella</i> and <i>Leptotrichia</i> were presumed to be healthy-related genus, yet this six genera were not statistically significant (P>0.05). Moreover, a cluster analysis revealed that the microbial composition of samples in the same group was often dissimilar but that the microbial composition observed in twins was usually similar. Although the genetic and environmental factors that strongly influence the microbial composition of dental caries remains unknown, we speculate that genetic factors primarily influence the individual's susceptibility to dental caries and that environmental factors primarily regulate the microbial composition of the dental plaque and the progression to caries. By using improved twins models and increased sample sizes, our study can be extended to analyze the specific genetic and environmental factors that affect the development of caries.</p></div