الفهرس 
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Abstract
The aim of this research was to evaluate the masticatory efficiency of mandibular overdenture retained by two intra-foraminal osseointegrated implants connected with SFI-Bar attachment by using two colored chewing gum. Materials and method : Six completely healthy edentulous patients were selected for this study. Two ossteointegrated implant fixtures were surgically inserted in the canine areas ; the bar abutments was screwed into the fixture analogs, SFI-bar adapters were connected to each implant fixture. We chosed The categories of chewing cycle numbers (n=0, 5, 10, 20, 30, 50). Using a flatbed scanner for scanning each specimen at a resolution of 500 dpi and analyzed by the operator (DH) using ViewGum software. Results : Digital image processing approved a significant relation between number of chewing cycles and colour mixing (P <0.001).In this study hue variation decreased significantly when number of chewing cycles increased. This was found due to presence of SFI-bar which increase retention and stability of the denture, this improve masticatory efficiency. Conclusion : Within the limitations of this study, SFI-bar increasing retention which improve masticatory efficiency. ViewGum software apply simple and speed application in evaluation chewing efficiency with two-colour chewing gum with using SFI-bar.