الفهرس 
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Abstract
This simulation study was conducted to evaluate and compare the effect of two treatment modalities on stresses induced on the implant supporting structure in BioHPP bar retained mandibular overdenture and BioHPP Implant supported fixed bridge using strain gauge analysis.
Two experimental mandibular prostheses supported by dental implants were constructed for this study on acrylic model. According to the difference between the two treatment modalities the experimental prosthesis was classified into:
The first design consisted of Mandibular overdentures supported by CAD CAM BioHPP milled interconnecting bar with resilient bar/clip attachment.
The second design consisted of BioHPP implant supported fixed bridge. The implant bridge was milled using CAD CAM technology in cut pack design framework and was veneered with special material.
Acrylic experimental mandibular model with four implants was used for this study .This model replicates the anatomic features of the lower edentulous jaw and the mucosa covering the ridge. Four channel strain meter was used to asses and record the strains induced to the distal abutments and residual ridge.
Two strain gauges were installed in the distal wall of distal implants. The other two gauges were installed on the buccal side of residual ridge at the second premolar. Loading device was used to produce a standardized static load within the physiologic limits of 100N on the second premolar and first molar area.
Microstrains were recorded at each site of the strain gauge during unilateral and bilateral loading with enough time elapsed between each loading to allow complete rebound of the resilient structures.
The results obtained showed that the greatest strain was induced on the right implant in design I during unilateral oblique load while the least strain was induced on the left ridge in design II during bilateral loading.