Influence of high insertion torque on implant placement: an anisotropic bone stress analysis

Autor(es)

Bruno Salles Sotto-Maior ^[1] ; Eduardo Passos Rocha ^[2] ; Erika Oliveira de Almeida ^[3] ; Amilcar Chagas Freitas-Júnior ^[4] ; Rodolfo Bruniera Anchieta ^[5] ; Altair Antoninha Del Bel Cury ^[6]

Afiliação do(s) autor(es)

^[1] University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil

^[2] São Paulo State University. Araçatuba Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[3] São Paulo State University. Araçatuba Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[4] São Paulo State University. Araçatuba Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[5] São Paulo State University. Araçatuba Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[6] University of Campinas. Piracicaba Dental School. Department of Prosthodontics and Periodontology - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 21, n. 6, p. 508-514, 2010-00-00.

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 (σmax) and maximum principal strain (εmax) 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 σmax and εmax values for cortical and cancellous bone. The σmax was smaller for the cancellous bone, with greater stress variation among the insertion torques. The εmax 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. (AU)

• Processo FAPESP: 09/14982-4 - Comportamento biomecânico de diferentes proporções coroa/implante na interface de implantes osseointegrados - estudo comparativo com elemento finito tridimensional
• Beneficiário: Bruno Salles Sotto Maior
• Modalidade de apoio: Bolsas no Brasil - Doutorado