IADR Abstract Archives
Prevalence of Hypomineralised Second Primary Molars in one Dublin School – Preliminary Findings of a Cross-Sectional Study.
Objectives: The study sought to determine the prevalence of hypomineralised second primary molars (HSPM) in 4-to-6-year-old Irish school children.
Methods: Ethical approval and parental/guardian consent were obtained. One primary school participated and 81 boys were examined in the school environment. HSPM were recorded using the MIH/HSPM index developed by Ghanim et al. ( 2015). Five examiners were calibrated in the diagnosis of enamel defects and dental caries. Inter-examiner and intra-examiner agreement had a kappa score of ≥0.70 for both HSPM and caries. Caries was recorded using the modified WHO caries index to the level of visual caries into dentine (dv3mft). The association between dental caries prevalence and HSPM was tested using Chi-square (α = 5%).
Results: The prevalence of HSPM was 38.2%.The mean number of affected teeth per child was 2.16±1.13. The most common defects were creamy-white demarcated opacities (81.8%) of affected teeth. This was significantly greater than the prevalence of yellow-brown demarcated opacities (7.6%), HSPM associated missing second primary molars (6.1%), atypical caries (3.03%) and post eruptive breakdown (1.5%). The most common form of extension reported was extension of less than one third of tooth surface affected. The prevalence of dental caries was 22.2% (mean dv3mft = 0.44±1.03). No association was found between caries experience and HSPM prevalence (p=0.25).
Conclusions: The prevalence of HSPM in this sample was 38.2% which is higher than existing studies in Europe. Demarcated opacities were the most common form of the defect. Caries rate is high (22%) but there was no association with HSPM in this sample. Continued investigation of HSPM prevalence is justified in a broader selection of children to determine HSPM prevalence in the population.
Methods: Ethical approval and parental/guardian consent were obtained. One primary school participated and 81 boys were examined in the school environment. HSPM were recorded using the MIH/HSPM index developed by Ghanim et al. ( 2015). Five examiners were calibrated in the diagnosis of enamel defects and dental caries. Inter-examiner and intra-examiner agreement had a kappa score of ≥0.70 for both HSPM and caries. Caries was recorded using the modified WHO caries index to the level of visual caries into dentine (dv3mft). The association between dental caries prevalence and HSPM was tested using Chi-square (α = 5%).
Results: The prevalence of HSPM was 38.2%.The mean number of affected teeth per child was 2.16±1.13. The most common defects were creamy-white demarcated opacities (81.8%) of affected teeth. This was significantly greater than the prevalence of yellow-brown demarcated opacities (7.6%), HSPM associated missing second primary molars (6.1%), atypical caries (3.03%) and post eruptive breakdown (1.5%). The most common form of extension reported was extension of less than one third of tooth surface affected. The prevalence of dental caries was 22.2% (mean dv3mft = 0.44±1.03). No association was found between caries experience and HSPM prevalence (p=0.25).
Conclusions: The prevalence of HSPM in this sample was 38.2% which is higher than existing studies in Europe. Demarcated opacities were the most common form of the defect. Caries rate is high (22%) but there was no association with HSPM in this sample. Continued investigation of HSPM prevalence is justified in a broader selection of children to determine HSPM prevalence in the population.