Title: Retention and surface roughness of Co-Cr bars supporting mandibular implant over-denture fabricated with two different techniques
Abstract:
Purpose: The aim of this study was to compare the effect of laser-sintered and conventional cobalt-chromium bars on retention and surface roughness in mandibular implant overdenture
Material and methods: a completely edentulous mandible model fabricated from epoxy resin was used for this study. Implants were imbedded in canine region in the model, then implant abutment were screwed on each implant. Scan bodies were inserted, then scanning of the 3D model was done using laboratory scanner. CO-CR bars were divided into: Group A: six bars that were fabricated using the laser sintering method. Group B: Six bars were designed using CAD/CAM for fabrication of wax model, then bar was fabricated using conventional lost wax -casting technique. Each bar and implant were loaded with conventional acrylic resin denture. A universal testing machine was used to apply tensile load. surface roughness was estimated by using digital microscope with digital software The data was collected and analyzed using statical analysis.
Results: There was a significant difference between group A and group B regarding the technique of fabrication of the implant bar in both retention and surface roughness.
Conclusion: changing the technique for fabrication of the implant bars has improved retention and surface roughness of implant supported overdenture.
