Analysis of the biomechanical behavior of implant-supported maxillary fixed total prostheses made by 2 CAD-CAM additive techniques

• Grant number: 18/10378-4
• Support type: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2019
• Effective date (End): February 29, 2020
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal researcher: Marcelo Ferraz Mesquita
• Grantee: Daniele Valente Veloso
• Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil

Abstract

The objective of this study is to: 1- To compare the biomechanical behavior of fixed total dentures of type All-on-Six (S) made in titanium alloy by two CAD-CAM additive techniques: A: EBM - Electron-beam additive manufacturing; and B: SLM - Selective Laser Melting; and 2- Observe the effects: A- A application of aesthetic veneering about marginal misfit and distribution of tensions; B- Biomechanical cycling about marginal misfit and screw loosening torque. Work models will be manufactured from prototyped models (n=10): All-on-Six: 6 implants (S) and frameworks. Marginal misfit will be measured by single screw test protocol. The screws will be submitted to 10 N.cm torque through a digital torque meter and 24 hours later initial loosening torque will be evaluated. Tension distribution will be evaluated by extensometry and photoelastic analysis. All frameworks will receive application of veneering material, and then marginal misfit and tension distribution will be evaluated as described before. Frameworks with higher misfit will be submitted to spark erosion process. Screws will be retightened and new extensometry and photoelastics analysis will be done. Before and after mechanical cycling (106 mechanical cycles, 2Hz/130N), all specimens will have its marginal misfit levels and loosening torque measured. All data will be submitted to exploratory analysis and appropriated tests will be applied. (AU)