الفهرس 
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Abstract
Purpose: The goal of this study was to evaluate and compare stress transmitted to abutment tooth of distal extension removable partial denture retained with L-bar clasp – In vitro study of different origination of bar clasp to abutment tooth.Materials and Methods: Partially edentulous acrylic resin mandibular model of bilateral distal extension ridge with remaining teeth from first premolar to first premolar will be fabricated and duplicated to fifteen models.group 1 :( n=5) where bar clasp originated from the center of the mesio- buccal contour of the abutment tooth and retentive finger engage the distal under cut. group 2 :( n=5) where bar clasp originated from the center of the mesio- buccal contour of the abutment tooth and retentive finger engage the mesial under cut. group 3 :( n=5) where bar clasp originated from mesial contour and retentive finger engage the distal under cut.Results: For all group µ-strain in unilateral loading at distal, lingual and buccal surfaces of the abutment of unloaded side was significantly more than non-loading one. Conclusion: L-bar originated from the center to engage the mesiobuccal undercut is superior either that engage the distobuccal undercuts or originate from the mesial tooth surface to engage distal under cuts, regarding stress distribution on the abutment of distally extended RPD.