الفهرس 
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Abstract
The study aimed to evaluate the retention & fracture resistance of composite core to differently designed dowel heads To conduct this study, forty samples were prepared. Samples were divided into four groups (n=10) according to post head design, each group was further subdivided into two subgroups (n=5) according to the type of test used.Sub group A: samples were subjected to push out test. Subgroup B: samples were subjected to fracture resistance test.