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Background and Aim: Considering the effect of middle ear infection and dental caries on the children’s quality of life and ability to grow and thrive, high prevalence rates of these diseases in children, we conducted this study to evaluate the association between dental caries status and middle ear infection in preschool children in Rasht City. Materials and Methods: This study included 310 children between 3–6 years of age. Dental caries of the children were evaluated based on WHO decayed and filled primary teeth index. The children were divided into two groups; with and without caries and referred to Amiralmomenin Hospital in Rasht for clinical examination and audiometry test. Descriptive and analytical statistical tests were used for analysis at the significance level of 0.05. Results: 170 girls and 140 boys with mean age of 4.58±1.02 years participated in this study. Thirty children (9.67%) had middle ear effusion. Mean value of dft index was 2.07±2.35. Probability of middle ear infection with effusion in the children with dental caries was139% more (95%CI= 1.04- 5.50, OR = 2.39) than that in the children without dental caries which was statistically significant (P = 0.04). Other variables such as gender, age, education levels of fathers and mothers did not show any significant relationship with middle ear effusion (P >0.05). Conclusion: Middle ear effusion was significantly higher in the children with dental caries than in children without dental caries. Further prospective studies are recommended for evaluation of the effects of improved oral hygine on middle ear infection.

Objectives: The most important aspect of hearing loss is its effect on the communication abilities of individuals. The aim of this study was to compare the prevalence of attention deficit hyperactivity disorder (ADHD) in hearing-impaired (HI) children with normal-hearing (NH) peers., Methods: A total of 130 children (65 children with severe-to-profound hearing loss and 65 NH peers) participated in this cross-sectional study from November 2013 to May 2014. ADHD Rating Scale IV questionnaires were given to children's parents to collect data. Descriptive and analytical analyses were used in order to achieve the objectives of the study., Results: The mean age of the HI children and NH peers was 14.1 and 13.3 years, respectively. In the case group, 52 children suffered from congenital hearing loss and 10 children had acquired hearing loss. In total, 19 cases (29.2%) and eight controls (12.3%) were diagnosed with ADHD. This difference was statistically significant (P=0.017). The prevalence of ADHD in children with hereditary or acquired hearing loss was 30.7% and 20.0%, respectively. However, this difference was not significant (P=0.71)., Conclusion: The prevalence of ADHD in school-aged children with hearing loss is higher than that in the general population of the same age. We could not find significant differences between the different subgroups due to the small sample size. Therefore, we recommend a further larger study to determine the interaction between hearing loss and ADHD., (Copyright © 2020 French Society of Pediatrics. Published by Elsevier Masson SAS. All rights reserved.)