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- Oral yeast colonization throughout pregnancyPublication . Rio, Rute; Simões-Silva, Liliana; Garro, Sofia; Silva, Mário Jorge; Azevedo, Álvaro; Sampaio-Maia, BeneditaBackground: Recent studies suggest that placenta may harbour a unique microbiome that may have origin in maternal oral microbiome. Although the major physiological and hormonal adjustments observed in pregnant women lead to biochemical and microbiological modifications of the oral environment, very few studies evaluated the changes suffered by the oral microbiota throughout pregnancy. So, the aim of our study was to evaluate oral yeast colonization throughout pregnancy and to compare it with non-pregnant women. Material and Methods: The oral yeast colonization was assessed in saliva of 30 pregnant and non-pregnant women longitudinally over a 6-months period. Demographic information was collected, a non-invasive intra-oral examination was performed and saliva flow and pH were determined. Results: Pregnant and non-pregnant groups were similar regarding age and level of education. Saliva flow rate did not differ, but saliva pH was lower in pregnant than in non-pregnant women. Oral yeast prevalence was higher in pregnant than in non-pregnant women, either in the first or in the third trimester, but did not attain statistical significance. In individuals colonized with yeast, the total yeast quantification (Log10CFU/mL) increase from the 1st to the 3rd trimester in pregnant women, but not in non-pregnant women. Conclusions: Pregnancy may favour oral yeast growth that may be associated with an acidic oral environment.
- Study of the effect of chronic kidney disease on urea and ammonia levels in saliva using a sequential injection system with potentiometric detectionPublication . Costa, Carolina F.F.A.; Thepchuay, Yanisa; Sampaio-Maia, Benedita; Mesquita, Raquel B. R.; Rangel, António O. S. S.
- Pregnancy as a period of enhanced risk for non-cavitated caries lesionsPublication . Rio, Rute; Sampaio-Maia, Benedita; Pereira, Maria Lurdes; Silva, Mário Jorge; Azevedo, ÁlvaroPurpose: To investigate if pregnancy represents a period of increased risk of non-cavitated dental caries related to changes in saliva and oral health behaviours. Materials and Methods: A non-randomised longitudinal study was performed with 27 pregnant women and 25 nonpregnant women, who were evaluated twice with the same time gap (24 weeks on average). At the first visit sociodemographic and oral health-related behaviours were assessed through a structured questionnaire. At the second visit changes related to eating sweet snacks and oral hygiene habits were also assessed. In both visits the surface-related caries status was evaluated according to ICDAS II criteria. Calculation of D0 (Sound), D1-2 (visual changes) and D3-4 (precavitated caries lesions) Index was based on data collected from clinical examination. Saliva pH and saliva flow rate were also assessed. Results: Throughout pregnancy, a statistically significant increase of eating sweet snacks between main meals was reported, with no effective adaptation of oral hygiene habits. In comparison to the non-pregnant group, pregnant women presented a lower saliva pH at both the first and second visit, p < 0.0005. During the follow-up period, a decrease in the frequency of caries-free surfaces was observed in the pregnant women (p = 0.004) and an increase in precavitated caries lesions (p = 0.011). Conclusion: The main results support the hypothesis that during pregnancy women are prone to enamel demineralisation, namely, to exhibiting additional lesions characterised by precavitated caries lesions.