الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Aim of the study is to
1- Determine the eruption dates of primary and permanent teeth in a group of children in north Sinai Governorate.
2- Determine the sequence of eruption of primary & permanent teeth in a group of children in north Sinai Governorate.
3- Correlate between chronological and developmental age of eruption of primary teeth& permanent teeth in a group of children in north Sinai Governorate.