الفهرس 
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Abstract
This study aimed to evaluate the effect of two direct retainer
design on the stresses transmitted to the supporting structures of
unilateral distal extension base with two modification space. Materials
and method: Two models will be classified as following: Model I: The model
will be provided with partial denture combination cast metal framework retained
by RPI clasp design and occlusal rest on abutment. Model II: The model will be
provided with partial denture combination cast metal framework retained by
flexible retentive arm (wrought wire clasp). Universal testing machine was used
to apply compressive loads during strain measurements test, each model was
placed in a horizontal position, and each prosthesis was vertically loaded both
unilaterally on each side and bilaterally at the 2nd premolars by applying
100Newtons. Results: At the pier abutment RPI clasp showed statistically
significantly higher mean stress than wrought wire clasp. At the left second
premolar RPI clasp showed statistically significantly higher mean stress than
wrought wire clasp .At the free end saddle wrought wire clasp showed
statistically significantly higher mean stress than RPI clasp . Conclusion: the RPI
clasp retainer induced the greatest amount of stresses to the abutments teeth and
least amount of stresses to the residual ridge.
Keywords: Stress; Retainers; Pier Abutmen, Kennedy Class II.