الفهرس 
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Abstract
This study was conducted to get normative data of crown diameter of primary teeth of Yemenis children among primary schools students (3-7 years old) in capital of Yemen; Sana’a city Twenty one governmental schools were included.
This cross-sectional study was carried out on 1000 children, divided according to gender into 2 groups; 500 students were boys group, while 500 students were girls group.
In order to reach to our target morphologically sound sample we were excluded any subject that not fulfilled our predetermined criteria but we recorded those subject with dental caries and enamel defects and represented statistically. Finally, we found only 113 boys and 104 girls with sound primary teeth .We were selected only (100 male and 100 female) for Odontometric measurement’s.
Data were collected through a work sheet the crown dimensions were recorded mesiodistally, buccolingually and crown height.
Concerning dental caries and enamel defects that were excluded from odontometric study.