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Objective:The aim of the study is to evaluate the role of diet quality and oral flora on the dental health in the childhood period. Methods:A cross-sectional study was carried out with the participation of 98 children aged 9-14 and their parents who applied to the Pedodontics Clinic Dental Faculty of Marmara University. The decayed, missing, filled tooth and surfaces and DMFT, DMFS indexes were determined through visual dental examination. Anthropometric measurements and saliva samples, as well as 24 h food consumption records, were taken from each child. Saliva samples were analysed microbiologically. To evaluate dietary quality from intakes Healthy Eating Index-2015 (HEI-2015) scores were calculated. Results:The mean age of children was 10.8±1.5 and study sample compromised 44.9% males and 55.1% females. 75% of the children had normal height and 58.2% of them had normal BMI according to World Health Organisation (WHO) references. The mean number of decayed tooth and surface was 3.07±2.35; 4.34±3.78 respectively and the mean number of DMFT and DMFS indexes were 5.88±2.31; 8.05±4.58 respectively. The mean number of decayed, missing, filled teeth and DMFT, DMFS scores were found to be higher in children with poor diets (according to HEI-2015) but the difference was not statistically significant (p>0.05). The presence of lactobacilli in saliva samples of 5.5% of the children was observed and children have lactobacilli in their saliva samples had more decayed teeth (p<0.05). Conclusion:The study findings illustrate the relationship between decay development and lactobacilli. Further studies with high sample sizes are needed to examine the diet quality and oral health.

Objectives: Nowadays in pediatric dentistry, a raise in oral-dental health studies in twins, had been observed with the increasing twin births. The aim of this study was to investigate the differences in terms of oral-dental health between twin children and singleton children. Materials and Methods: A total of 180(105girls, 75 boys) children,120 of them twins and 60 of them singleton, aged 4 to 14 years,were included to the study.All children were healthy.A questionnaire,with 30 items, including the educational level of the parents, age, gender and brushing habits of the children was applied.The df-t /df-s index for primary teeth and DMF-T / DMF-S index for permanent teeth were recorded.Streptococcus Mutans(SM) values of all children were recorded with the help of chairside kits. Results: In-vitro fertilization(IVF) birth rate was 28.3% in the whole group.Furthermore, 33.3%of the children were monozygotic twins,66.6% of them were dizygotic twins.There were no statistically significant relationship between the DMFT-dft values and daily teeth brushing of children(p>0.05).A statistically significant correlation was found between mothers' education levels and DMFT values of children(p>0.05).DMFT values of children whose mothers' were university graduates were found to be significantly lower than those of primary and high school graduates (p>0.05).In the monozygotic group; in SM positive cases,the level of dft-dfs was statistically significantly higher than those of SM negative cases(p<0.05).In dizygotic twins and singleton children;DMFT-DMFS levels were significantly higher in SM positive cases than those of SM negative cases(p<0.05). In singleton children the DMFT-DMFS values were statistically significantly higher than twins whereas there was no statistically difference between monozygotic and dizygotic twins. Conclusions: As a result of this study, despite that there was no significant difference in teeth brushing habits between twin and singleton children, the SM values and DMFT-DMFS values were found higher in singleton children. Considering the multifactorial dynamics of dental caries formation, many factors such as saliva, nutrition, immune system, as well as oral hygiene habits should be considered as a whole.