Cobalt Chromium versus Zirconia frameworks on stresses induced in implants supporting structures using ALL-ON-4®protocol (Strain Gauges Analysis)

Abstract

Completely edentulous maxillary cast was prototyped using 3D printing technology. This was done via scanning an educational model and designing an STL file including all the details required; implants beds, mucosal space for mucosa simulation and vertical slots for strain gauges which were 1mm distal and labial to each implant. Mucosa simulation was planned to mimic the viscoelasticity of the fibrous mucoperiostium by prototyping a mucosa simulator over the scanned model after removing 2 mm space over the crest of the ridge and making all around shelf for stabilization of the removable mucosa. Printing was ordered and mucosa simulation was done by an addition silicon rubber base utilizing the printed mucosa simulator. Four dummy implants were placed in their beds. Multiunits abutments were placed above implants, then abutments were placed where fixed detachable prosthesis were fabricated. This study was divided into two groups according to the type of fixed detachable prosthesis: Group (1): complete implant supported Cobalt Chromium fixed detachable prosthesis.