Methods The present study aimed to identify patterns and processes in acquisition of oral bacteria and to characterize the microbiota of different dentition states and habitats. Mucosal, salivary, supragingival, and subgingival biofilm samples were collected from orally and systemically healthy children and mother-child dyads in predentate, primary, mixed, and permanent dentitions. 16S rRNA gene sequences were compared to the Human Oral Microbiome Database (HOMD). Functional potential was inferred using PICRUSt.ResultsUnweighted and weighted UniFrac distances were significantly smaller between each mother-predentate dyad than infant-unrelated female dyads. Predentate children shared a median of 85% of species-level operational taxonomic units (s-OTUs) and 100% of core s-OTUs with their mothers. Maternal smoking, but not gender, mode of delivery, feeding habits, or type of food discriminated between predentate microbial profiles. The primary dentition demonstrated expanded community membership, structure, and function when compared to the predentate stage, as well as significantly lower similarity between mother-child dyads. The primary dentition also included 85% of predentate core s-OTUs. Subsequent dentitions exhibited over 90% similarity to the primary dentition in phylogenetic and functional structure. Species from the predentate mucosa as well as new microbial assemblages were identified in the primary supragingival and subgingival microbiomes. All individuals shared 65% of species between supragingival and subgingival habitats; however, the salivary microbiome exhibited less than 35% similarity to either habitat.ConclusionsWithin the limitations of a cross-sectional study design, we identified two definitive stages in oral bacterial colonization: an early predentate imprinting and a second wave with the eruption of primary teeth. Bacterial acquisition in the oral microbiome is influenced by the maternal microbiome. Personalization begins with the eruption of primary teeth; however, this is limited to phylogeny; functionally, individuals exhibit few differences, suggesting that microbial assembly may follow a defined schematic that is driven by the functional requirements of the ecosystem. This early microbiome forms the foundation upon which newer communities develop as more colonization niches emerge, and expansion of biodiversity is attributable to both introduction of new species and increase in abundance of predentate organisms.Electronic supplementary materialThe online version of this article (10.1186/s40168-018-0443-2) contains supplementary material, which is available to authorized users.

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The purposes of our study were, first, to determine the prevalence of dental caries in young patients with congenital cardiac disease, second, to determine the effect of oral health in their quality of life, third, to examine parental knowledge about associations between oral health and cardiac health, and fourth, to examine parental perceptions regarding access to dental care. A standardized questionnaire was given to a convenience sample of parents of 43 children with cardiac disease and 43 healthy controls from 12 to 71 months of age. In every patient, we performed a dental examination. Descriptive statistics, the two-tailed t-test, and Fisher's exact test were used for statistical analysis. Of the children with cardiac disease, 17% had caries, compared to 13% of the control group. Almost half of those with cardiac disease had never seen a dentist, compared to 35% of the control subjects. Of the parents of those with cardiac disease, one-fifth did not know whether oral health was important for the heart, compared to one-tenth of controls. Insurance and access to care were not barriers to obtain dental treatment. Statistically significant differences were, first, parents of children with congenitally malformed hearts felt more guilt about their child's oral health than control parents (p = 0.026), second, they were more upset about the dental problems and/or treatments of their children (p = 0.012), and third, they thought that dental problems and/or dental treatment made their children more irritable (p = 0.012). Our findings indicate that it is of paramount importance that cardiologists and their associated staff educate patients and families about oral health and other issues associated with congenital cardiac disease.