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Regular and Platform Switching: Bone Stress Analysis Varying Implant Type
Author(s) -
GurgelJuarez Nália Cecília,
de Almeida Erika Oliveira,
Rocha Eduardo Passos,
Júnior Amílcar Chagas Freitas,
Anchieta Rodolfo Bruniera,
de Vargas Luis Carlos Merçon,
Kina Sidney,
França Fabiana Mantovani Gomes
Publication year - 2012
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2011.00801.x
Subject(s) - abutment , materials science , implant , von mises yield criterion , stress (linguistics) , workbench , orthodontics , cortical bone , dental implant , finite element method , biomedical engineering , structural engineering , anatomy , engineering , medicine , mechanical engineering , surgery , visualization , linguistics , philosophy
Purpose: This study aimed to evaluate stress distribution on peri‐implant bone simulating the influence of platform switching in external and internal hexagon implants using three‐dimensional finite element analysis. Materials and Methods: Four mathematical models of a central incisor supported by an implant were created: External Regular model (ER) with 5.0 mm × 11.5 mm external hexagon implant and 5.0 mm abutment (0% abutment shifting), Internal Regular model (IR) with 4.5 mm × 11.5 mm internal hexagon implant and 4.5 mm abutment (0% abutment shifting), External Switching model (ES) with 5.0 mm × 11.5 mm external hexagon implant and 4.1 mm abutment (18% abutment shifting), and Internal Switching model (IS) with 4.5 mm × 11.5 mm internal hexagon implant and 3.8 mm abutment (15% abutment shifting). The models were created by SolidWorks software. The numerical analysis was performed using ANSYS Workbench. Oblique forces (100 N) were applied to the palatal surface of the central incisor. The maximum (σ max ) and minimum (σ min ) principal stress, equivalent von Mises stress (σ vM ), and maximum principal elastic strain (ε max ) values were evaluated for the cortical and trabecular bone. Results: For cortical bone, the highest stress values (σ max and σ vm ) (MPa) were observed in IR (87.4 and 82.3), followed by IS (83.3 and 72.4), ER (82 and 65.1), and ES (56.7 and 51.6). For ε max , IR showed the highest stress (5.46e‐003), followed by IS (5.23e‐003), ER (5.22e‐003), and ES (3.67e‐003). For the trabecular bone, the highest stress values (σ max ) (MPa) were observed in ER (12.5), followed by IS (12), ES (11.9), and IR (4.95). For σ vM , the highest stress values (MPa) were observed in IS (9.65), followed by ER (9.3), ES (8.61), and IR (5.62). For ε max , ER showed the highest stress (5.5e‐003), followed by ES (5.43e‐003), IS (3.75e‐003), and IR (3.15e‐003). Conclusion: The influence of platform switching was more evident for cortical bone than for trabecular bone, mainly for the external hexagon implants. In addition, the external hexagon implants showed less stress concentration in the regular and switching platforms in comparison to the internal hexagon implants.