الفهرس 
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Abstract
Aim: To assess the prevalence of molar incisor hypomineralization among a group of Egyptian children aged 8-12 years old in Giza Governorate.
Methodology: The number of students included in this study were 371. The index teeth of the participants including the eight incisors and the four 1st permanent molars were cleaned using a cotton roll and a probe was used for cleaning the molars’ fissures. MIH was recorded when at least one of the first permanent molars shows any of the diagnostic criteria of MIH according to the modified index
developed in line with EAPD criteria. A specially designed chart was used to record the presence/absence of molar incisor hypomineralization and its severity based on EAPD criteria 2009.
Results: The gender distribution among the participants was 191 boys (51.5%) and 180 girls (48.5%).The mean (SD) values for age were 10.1 (±1.4) years with a minimum of 8 and a maximum of 12 years
old. . There were more male participants diagnosed with MIH than females. MIH was found in 10 children giving a prevalence of 2.7% among the examined children. 70% of the children diagnosed
with MIH presented lesions in both permanent first molars and incisors with different degrees, and 30% of them presented lesions in permanent first molars only.
Conclusions: The prevalence of MIH among the study sample was 2.7%. The most prevalent defect reported in this study was demarcated opacity. The most common degree of severity of MIH in the studied population was the mild degree.