الفهرس 
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Abstract
The present study was performed in an attempt to throw a beam of light on the retention efficiencies of four preformed clasps, namely; Adams, ball, triangular and adjustable. The effect of increasing the number of clasps on the retention of the acrylic plates was also investigated.
This study was earned out on upper acrylic models of ten young adult volunteers with complete accepted dentition and well exposed Jinical crowns.