الفهرس 
Prevalence of molar incisor hypomineralization among a group of Egyptian children aged from eight to twelve years old in Dakahlia governorate
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Abstract
Aim: To assess the prevalence of Molar Incisor Hypomineralization among a group of Egyptian children aged from 8-12 years old, in Dakahlia governorate schools. Methodology: The study was carried out on 10% of children aged from 8 to 12 years old who attended primary governmental schools in Dakahlia governorate. Personal data including date, name, age, gender, address, school name, as well as the medical history and any previous dental history were recorded for each child in a custom made examination chart. Clinical examination was carried out in the school laboratory or an empty class, in day light.Teeth were cleaned gently using gauze then wet with saliva during examination. A disposable diagnostic set (mirror, probe) was used for each patient to examine the four first permanent molars and the eight maxillary and mandibular incisors to detect the presence of MIH and its severity based on European Academy of Pediatric Dentistry criteria and scores were recorded in the chart.No diagnostic radiographs were taken.Results: The results of the present study showed that the MIH prevalence was (5.8%) among 52968 examined Egyptian children in Dakahlia governorate schools,51.5% (1588) were females while 48.5% (1496) were males, the mean age for males and females were (10.2) and (10.1) years respectively, Regarding the severity of MIH, (51.6%) of all the affected incisors were mild and (48.2%) had no defect, while for affected first permanent molars, about (72.04%) were mild, (5.9%) moderate and (21.5%) were severe.Conclusion: Prevalence of MIH in a 10% of children aged from 8 to 12 years old who attended primary governmental schools in Dakahlia governorate was (5.8%), Molars were the most prevalent teeth affected. Females are more frequently affected by MIH than males. The most prevalent degree of severity of MIH was 2mild3 followed by 2severe3 then 2moderate3 among all the affected teeth