الفهرس 
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Abstract
Aim: The aim of this study is to assess the prevalence of MIH among a group of Egyptian
children in Fayoum governorate schools. Methodology: The study was performed on 450
child who attended primary and preparatory governmental and private schools in Fayoum
governorate. Personal data, as well as the medical history and any previous dental history were
recorded for each child in the diagnostic chart. Clinical examination was performed in the school
laboratory or an empty class using day light. The first permanent molars and permanent incisors
were examined to detect the presence of MIH and its severity based on European Academy of
Pediatric Dentistry criteria and scores were recorded in the diagnostic chart. Results: A group
of Egyptian students were examined in Fayoum governorate schools with the mean age of
(11.27±1.20) years, 263(58.4%) were males and 187(41.6%) were females, 22 students were
diagnosed with MIH and MIH prevalence was (4.9%). Regarding MIH severity, out of all MIH
affected teeth (65.7%) had mild MIH, (12.9%) had moderate MIH and (21.4%) had severe MIH.
Conclusion: Upper right central incisor was the most prevalent tooth with MIH. The most
prevalent degree of MIH severity was mild, followed by severe, then moderate. White or creamy
demarcated opacities was the most prevalent enamel defect form.
Key words: MIH, Molar incisor hypomineralization, prevalence, First permanent molars,
permanent incisors.