Influence of high insertion torque on implant placement - an anisotropic bone stress analysis
Data
2010-12-01
Autores
Sotto-Maior, Bruno Salles
Rocha, Eduardo Passos [UNESP]
de Almeida, Erika Oliveira [UNESP]
Freitas-Júnior, Amilcar Chagas [UNESP]
Anchieta, Rodolfo Bruniera [UNESP]
Del Bel Cury, Altair Antoninha
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Resumo
The aim of this study was to evaluate the influence of the high values of insertion torques on the stress and strain distribution in cortical and cancellous bones. Based on tomography imaging, a representative mathematical model of a partial maxilla was built using Mimics 11.11 and Solid Works 2010 softwares. Six models were built and each of them received an implant with one of the following insertion torques: 30, 40, 50, 60, 70 or 80 Ncm on the external hexagon. The cortical and cancellous bones were considered anisotropic. The bone/implant interface was considered perfectly bonded. The numerical analysis was carried out using Ansys Workbench 10.0. The convergence of analysis (6%) drove the mesh refinement. Maximum principal stress (σ max) and maximum principal strain (ε max) were obtained for cortical and cancellous bones around to implant. Pearson's correlation test was used to determine the correlation between insertion torque and stress concentration in the periimplant bone tissue, considering the significance level at 5%. The increase in the insertion torque generated an increase in the σ max and ε max values for cortical and cancellous bone. The σmax was smaller for the cancellous bone, with greater stress variation among the insertion torques. The ε max was higher in the cancellous bone in comparison to the cortical bone. According to the methodology used and the limits of this study, it can be concluded that higher insertion torques increased tensile and compressive stress concentrations in the periimplant bone tissue.
Descrição
Palavras-chave
Dental implants, Finite element method, Insertion torque, anisotropy, biological model, compressive strength, computer simulation, dental care, finite element analysis, maxilla, methodology, physiology, tensile strength, tooth implantation, torque, Anisotropy, Compressive Strength, Computer Simulation, Dental Implantation, Endosseous, Dental Implants, Dental Stress Analysis, Finite Element Analysis, Maxilla, Models, Biological, Tensile Strength, Torque
Como citar
Brazilian Dental Journal, v. 21, n. 6, p. 508-514, 2010.