Stresses in implant-supported overdentures with bone resorption: a 3-D finite element analysis

  • Luiz Oscar Honorato Mariano Universidade do Sul de Santa Catarina
  • Evandro Afonso Sartori Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS
  • Josué Ricardo Broilo Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS
  • Rosemary Sadami Arai Shinkai PUCRS
  • Leandro Corso University of Caxias do Sul, Caxias do Sul, RS
  • Rogério José Marczak Federal University of Rio Grande do Sul, Porto Alegre, RS
Keywords: Dental implants, overdenture, biomechanics, finite element analysis

Abstract

Purpose: This 3D-finite elements method study evaluated the effect of bone resorption on the stress distribution in overdentures with bone loss surrounding implants and resorption of the distal ridge. Methods: Tridimensional models were built from the images of a computerized tomography of a mandible and 3D laser digitalization of implants, abutments, mucosa, and complete denture. The geometric models of implants and abutments were mounted at the canine region to build reference model 1 - absence of bone resorption. To build the test models the mandible geometric solid was modified to simulate 2-mm vertical bone loss surrounding the implants (model 2) and resorption of the distal ridge (model 3). Finite elements models were generated, and a 100 N static load was applied at the first molar region of each model to compare the von Mises stress distributions in selected points. Results: Von Mises stresses increased on the bone surrounding implants and on the prosthetic components in the model with 2-mm vertical bone loss. The combination of 2-mm vertical bone loss and resorption of the distal ridge did not increase the stresses compared with the model with only bone loss surrounding implants. The highest stress concentration at marginal bone and implants occurred on the same side of the vertical load application for all models. Conclusion: The results suggest that the bone loss surrounding implants increases stress concentration in dental implants, abutments, and marginal bone independently from the bone resorption of the distal ridge.

Author Biographies

Luiz Oscar Honorato Mariano, Universidade do Sul de Santa Catarina
Universidade do Sul de Santa Catarina Departamento de Ciências Biológ. e da Saúde e de Ciências Soc. Aplicadas. Avenida José Acácio Moreira, 787 – Dehon Tubarão, SC – Brasil 88704-900
Rosemary Sadami Arai Shinkai, PUCRS
Departamento de Prótese Dentária. Programa de Pós-Graduação em Odontologia. PUCRS
Leandro Corso, University of Caxias do Sul, Caxias do Sul, RS
Department of Engineering
Rogério José Marczak, Federal University of Rio Grande do Sul, Porto Alegre, RS
Department of Mechanical Engineering
Section
Original Article