الفهرس 
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Abstract
This work was done to study the effect of the degree of convergence and intracoronal reparation on retention of full cast crowns. Eight copper metal dies were prepared in the form of full crown przparation and divided into two main groups: Group (A) : Full crown preparation with 1C? convergence. Group (B) : Full crown preparation with r5 convergence. Each group was divided into four subgroups : Subgroup I : Full crown preparation as control. Subgroup I1 : Full crown preparation with Black’s class I preparation. Subgroup I11 : Full crown preparation with X.0.D. preparation.