OBJECTIVE: Evaluate the biomechanical behavior of fixed dentures using short implants in atrophic jaws. MATERIALS AND METHODS: Using SolidWorks ® 2011 Premium will be made three-dimensional computer models of jaws, cylindrical short implants (Cone Morse), and fixed prostheses, divided into the following groups: IC5 - models with implants of 5 mm in length, IC7 implants with 7mm , IC9 implants 9 mm of length, while the fourth group will have implants of medium length (11mm) considered the control group (CG). All groups will have the same number (4) and diameter of implants (4 ). For each implant is shaped intermediate and a retaining screw of the prosthesis. The length of the cantilever is equal for all group (15mm) , including a pre-molar and a premolar. All elements will be attached to the mandibular bone modeled by means of CT images and with the aid of Mimics ® software, composing the different groups. The analysis of stress distribution will be made at Ansys Workbench ® software with 100N load located in the buccal cusp of the premolar and a second load of the same intensity and direction wil be located in the distobuccal cusp of the first molar, simulating a complete denture in antagonist arch. A second load of 270N will be applied, following the same scheme, simulating the load intensity of toothed or fixed prostheses in antagonist arch. The values of maximum and minimum principal stress, shear stress and Von Mises stress will be obtained from the bone, implants and prosthesis.
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