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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 6
Document type: Journal article
Source: Brazilian Dental Journal; v. 21, n. 6, p. 508-514, 2010-00-00.
Abstract

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)

FAPESP's process: 09/14982-4 - BIOMECHANICAL BEHAVIOR OF DIFFERENT CROWN/IMPLANT RATIOS IN THE INTERFACE IN OSSEOINTEGRATED IMPLANTS - A THREE-DIMENSIONAL FINITE ELEMENT COMPARATIVE STUDY
Grantee:Bruno Salles Sotto Maior
Support Opportunities: Scholarships in Brazil - Doctorate