الفهرس 
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Abstract
Summary
Newly erupted Permanent First Molars (PFMs) with opacities or disintegrating enamel are being observed with increasing frequency amongst school children seeking dental treatment. These defects were first documented in Sweden in the late 1970s, and now it known as MIH. MIH is gaining considerable interest amongst epidemiologists and clinicians worldwide probably owing to its widespread presence and clinical impact.
Hence, the present study was carried out to assess the prevalence and severity of MIH among a group of school children in Minia Governorate.
Children aged 8-12 years of both sexes were selected from private and public schools by multistage cluster sample. 1044 Children were examined at their classrooms according to EAPD criteria. The examined children were (52.85%) males (47.14%) females. All the present first permanent molars and incisors were examined without previous prophylaxis or tooth brushing.
The data was collected from those samples and analyzed. The results showed the prevalence of the MIH and degree of severity of affection.
Results of the study revealed that:
1- The overall prevalence of MIH in the studied group was (8.23%); males (48.84%) and females (51.16%). There was no significant difference between sexes in the prevalence of MIH.
2- In regards to socioeconomic level, the current results of the present study revealed that the prevalence of MIH was statistically higher in children in public schools (low socioeconomic level) than those in private schools (high socioeconomic level).
3- No statistical difference in the prevalence of MIH between different age groups.
4- Mild lesions of MIH comprised the majority of cases while sever lesions of MIH comprised the minority of cases. Demarcated opacities were the most prevalent type of MIH.
5- The final results showed that, the prevalence and severity of defects in molars were more than those found in incisors and the affected molars showed higher prevalence of demarcated opacities and post eruptive enamel breakdown than affected incisors.