Biomechanical analysis of prosthetic options for rehabilitation of posterior maxillary area with three-unit fixed prosthesis supported by implants. A 3D finite element analysis

Author(s)

Victor Eduardo de Souza Batista

• Document type: Doctoral Thesis
• Press: Araçatuba. 2018-04-06.
• Institution: Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba
• Defense date: 2018-03-05
• Advisor: Eduardo Piza Pellizzer; Fellippo Ramos Verri

Abstract

Objective: The aim of this study was to analyze the biomechanical behavior of three-unit fixed prosthesis varying the union (single crowns and splinted crowns: straight-line and offset implant configurations), length, diameter, and the number of implant (supported by two or three implants) by 3D finite element analysis. Material and Methods: Twenty-six 3-D models were simulated with the software’s In Vesalius, Rhinoceros 4.0, SolidWorks 2010 and. Each model represented a posterior maxillary bone section simulating type IV bone (cortical and spongy), with presence of 3-units fixed prosthesis supported by two or three dental implants, external hexagonal connection, in different clinical situations, varying the factors union (single crowns and splinted crowns: straight-line and offset implant configurations), length and diameter. The 3D models were exported to the software FEMAP 11.1.2 for pre- and post- processing and mesh generation besides load definition (400N vertical and 200N oblique,45°). After, the models were solved by NeiNastran 11.1 finite element software and the results were visualized by maximum principal stress (MPa) and microstrain (µε) maps to cortical bone tissue and von Mises stress (MPa) map to fixation screws. Results: Overall, the models with splinted crowns associated with offset implant placement showed the best biomechanical behavior. The reduction in the number of implants generated a biomechanical behavior. The increase of the implant diameter in the molar region was beneficial to improve the biomechanical behavior of the dental rehabilitation. Conclusion: Planning considering the placement of an implant for each lost tooth offered the lowest values of stress in the fixation screws and the lowest values of strain/microdeformation in the cortical bone tissue. The splinting associated with offset implant configuration was beneficial to improve the biomechanical behavior of the rehabilitations, as well as the increase of the implant diameter of the molar region. (AU)

• FAPESP's process: 15/07383-8 - Biomechanical analysis of prosthetic options for rehabilitation of posterior maxillary area with three-unit fixed prosthesis supported by implants
• Grantee: Victor Eduardo de Souza Batista
• Support Opportunities: Scholarships in Brazil - Doctorate