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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.)

Effect of the Parafunctional Occlusal Loading and Crown Height on Stress Distribution

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Leonardo Bueno Torcato ; Eduardo Piza Pellizzer ; Fellippo Ramos Verri ; Rosse Mary Falcón-Antenucci ; Victor Eduardo de Souza Batista ; Leonardo Ferreira de Toledo Piza Lopes
Total Authors: 6
Document type: Journal article
Source: Brazilian Dental Journal; v. 25, n. 6, p. 554-560, Dez. 2014.

The aim of this study was to assess, by the three-dimensional finite element method, the influence of crown-to-implant ratio and parafunctional occlusal loading on stress distribution in single external hexagon implant-supported prosthesis. Computer-aided design software was used to confection three models. Each model was composed of a block bone and an external hexagon implant (5x10.0 mm) with screw-retained implant prostheses, varying the height crown: 10, 12.5 and 15 mm. Finite element analysis software was used to generate the finite element mesh and to establish the loading and boundary conditions. Normal (200 N axial and 100 N oblique load) and parafunctional forces (1,000 N axial and 500 N oblique load) were applied. The results were visualized by von Mises and maximum principal stress. In comparison with the normal occlusal force, the parafunctional occlusal force induced an increase in stress concentration and magnitude on implant (platform and first threads) and screw (neck). The cortical bone showed the highest tensile stress under parafunctional force (oblique load). The stress concentration increased as the crown height increased. It was concluded that: increasing the C/I increased stress concentration in both implant components and cortical bone; parafunctional loading increased between 4-5 times the value of stresses in bone tissue compared with functional loading; the type of loading variation factor is more influential than the crown-to-implant factor. (AU)

FAPESP's process: 11/03624-0 - Influence of parafunctional oclusal loading on implant-suported prosthesis by varying the crown/implant ratio and the prosthetic connection system. Study by the finite element method
Grantee:Leonardo Bueno Torcato
Support type: Scholarships in Brazil - Master