The aim of this study to assess dental caries status and some growth indices among preschool children of Ulaanbaatar city, Mongolia. The study population consisted of 499 preschool children aged 3-5 years old randomly selected from 6 kindergartens of Ulaanbaatar city. The all children were examined oral examination and body weight and height by anthropometric methods. 1. The caries prevalence of all preschool children was 92.9%. The mean dmft and dmfs score were 8.2±4.8 and 11.7±8.6 of all children, 8.4±4.6 and 12.9±9.1 of 5 years old, 7.8±5.4 and 10.9±9.1 of 4 years old, 8.4±4.7 and 11.3±7.7 of 3 years old, respectively (p<0.01).2. The average body weight and height were 15.8±2.2 кg and 97.7±5.8 cm of 3 years old, 17.2±1.8 kg and 103.4±4.7 cm of 4 years old, 18.5±2.3 kg and 108.1±5.5 cm of 5 years old, respectively (p<0.001).The dental caries prevalence and mean dmft score among preschool children of Ulaanbaatar city were “VERY HIGH” stage, which is determined by criteria WHO. The body height and weight of preschool children of Ulaanbaatar city are increasing year by year. There is not observed significantly the relationship between dental caries status and body growth indices

Dental caries is prevent problem, not only Mongolia, but also world wide. According to World Health Organization’s report in 1976 the mean DMFT of 12 years old of Mongolian children was 1.48 and in 1990 was 2.6. According to Mongolian research studies, the prevalence of caries and mean DMFT children within the age range of 3-17 years old was 79.2% and 3.88 and in 3-5 years old children were 4.9 correspondingly. Several investigators have reported increasing caries rate among Mongolian children, especially those living in cities. The aim of this study to access dental caries status among preschool, children of Ulaanbaatar city, Mongolia.The study covered 294 preschool children who were 3 - 5 years randomly selected from 2 kindergartens of Ulaanbaatar city. Design: Cross – sectional study, oral epidemiological survey based on World Нealth Organization methodology clinical examination.The caries prevalence of all preschool children was 85%. The caries prevalence in 3 years old children was 75.6%, in 4 years old, it was 85.78% in 5 years old, it was 93.8%. The caries prevalence was high among 5 years old children. The mean dmft score was 6.2±0.2 all children.Only 15% of the children were caries free. The caries prevalence of the preschool children was 85%, and the mean dmft (decayed, missing, filled tooth) were 6.2±0.2. The dental caries prevalence and mean dmft score among preschool children of Ulaanbaatar city were “VERY HIGH” stage which is determined by criteria World Health Organization.

Purpose: To study some growth indices and dental caries status of twins of kindergarten, Ulaanbaatar city.Methods: The study group consists of 7 pairs or 14 twins and control group consist of 14 children, who were same aged and same classmates of twins. The body weight and height of all children was measured by anthropometric methods and dental examination was done by WHO criteria 2003. The plaque index was determined by Pederov-Volodkini and caries activity was determined by Shimono (1974).Results: 1. The average body weight of study group was lower than control group, but the average body height of study group was higher than control group (p<0.01). 2. The mean deft score 6 dft, 7 dfs in study group and 8 dft, 12 dfs in control group, respectively (p<0.05). 3. Satisfactory of oral hygiene index was 64% in study group and 57% in control group (p<0.05). 4. When we determined the caries activity, high caries activity group was 50% in study group and 57% in control group (p<0.01). Conclusion: The risk factors and scores of dental caries of twin were lower than the control group. In the future we have to carry detailed study to relationship between body weight and mean dft score.