الفهرس 
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Abstract
In this study a lower stone completely dentulous model was modified to represent Kenndy class I with anterior modification area .The remaining natural teeth were canine, first and second premolar bilaterally. A removable partial denture was constructed on this model.
Numerical model construction was obtained by C.T scanning of the RPD with the cast and using MIMICS soft ware.
This model was introduced into ANSYS 11 program, In ANSYS program the model was duplicated into two models, which were identical except in the clip bar attachment on the splinted implants in the anterior modification area in one model ,while the other one was only splinted implants with bar without clip attachment.
Every model was loaded in tissueward and in tissueaway resulting in four models.
Model 1: RPD with clip bar attachment between the two implants during tissue word loading.
Model 2: RPD with bar between the two implants during tissue word loading.
Model 3: RPD with bar between the two implants during tissue away loading.
Model 4: RPD with clip bar attachment between the two implants during tissue away loading.
Summary
The stress analysis was done under unilateral loading of 300 N on left second molar tooth first in tissueward and second in tissueaway direction. In each model stresses were measured around left abutment tooth (second premolar, working side), right abutment tooth (second premolar, balancing side), left implant, and right implant.
The effect of using clip bar attachment on the splinted implants in the anterior modification area and abutment teeth were evaluated by finite element analysis. The principle stresses obtained from this study were calculated and tabulated to compare the two RPD designs. The results revealed no difference between the stress distribution patterns of the two studied designs.