الفهرس 
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Abstract
Comparison between hard and Flexible Acrylic resin on overdenture retention 1.-The flexible acrylic resin in this study showed promising results regarding retention especially when using long copy preparation 2.-Short copies preparation with flexible mandibular overdenture showed more retentive values than with hard acrylic mandibular overdenture. 3.-The retention forces decreased by time from the first day and after one month in both flexible and hard acrylic mandibular overdenture with the preference to the flexible one.