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Biomechanical analyses of the fixed maxillary full-arch frameworks made according to the all-on-four or all-on-six concepts

Grant number: 13/22232-0
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2014
Effective date (End): February 29, 2016
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Valentim Adelino Ricardo Barão
Grantee:Cláudia Lopes Brilhante Bhering
Host Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil


The aim of this study is to evaluate and compare the techniques used to maxilla rehabilitation with dental implants (all-on-four or all-on-six), the materials used to make the prosthetic framework and the role of the oblique forces on stress of the prosthesis-implant-system. Three-dimensional finite element models will be built to simulate a fully edentulous maxilla would be rehabilitated with implant-supported full-arch dentures. The models will be made 4 implants positioned according to the technique "all-on-four" (F) and 6 implants according to the technique "all-on-six" (S). Fixed full-arch frameworks will be modeled in each material evaluated: Titanium cp. (Ti), Cobalt- chromium (CoCr) and Zirconia (Zi). All structures will be constructed using specific modeling software (Rhinoceros 4.0 SR8; McNeel North America, Seattle, WA, USA) and then exported to the ANSYS Workbench 12.0.1 program in which the meshes will generated with tetrahedral elements with 10 nodes. All materials were considered to be isotropic, homogeneous and linearly elastic. The models will be divided into groups according clinical situation (all-on-four ou all-on-six) and materials evaluated (Ti, CoCr and Zi). The stress values and stress distribution patterns will be evaluated into two moments: after the tightening of the prosthetic screws with preload correspondent to 10Ncm torque (settlement of the framework); and after the application of 130N oblique load. The results will be analyzed qualitatively and quantitatively through the Von Mises stress (metal and zirconia), maximum principal stress, shear stress and strain (bone tissue).

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BRILHANTE BHERING, CLAUDIA LOPES; MESQUITA, MARCELO FERRAZ; KEMMOKU, DANIEL TAKANORI; NORITOMI, PEDRO YOSHITO; XEDIEK CONSANI, RAFAEL LEONARDO; RICARDO BARAO, VALENTIM ADELINO. Comparison between all-on-four and all-on-six treatment concepts and framework material on stress distribution in atrophic maxilla: A prototyping guided 3D-FEA study. Materials Science & Engineering C-Materials for Biological Applications, v. 69, p. 715-725, . (13/22232-0)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
BHERING, Cláudia Lopes Brilhante. Biomechanical analysis of maxillary full-arch fixed prosthetic frameworks manufactured according to all-on-four or all-on-six concept. 2016. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba Piracicaba, SP.

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