Analysis of Bone-implant Interfacial Stress during Disocclusion in Complete Implant-supported Prosthesis: A Finite Element Study
Gustavo Diniz Greco
Department of Restorative Dentistry, Sistema Integrado de Ensino de Minas Gerais Ltda., Belo Horizonte, MG, Brazil.
Carolina Nemesio de Barros Pereira
Private Practice, Belo Horizonte, MG, Brazil.
Giovani Lana Peixoto de Miranda
Department of Restorative Dentistry, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG, Brazil.
Guilherme Carvalho Silva
Department of Restorative Dentistry, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG, Brazil.
Cláudia Silami de Magalhães
Department of Restorative Dentistry, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG, Brazil.
Allyson Nogueira Moreira *
Department of Restorative Dentistry, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG, Brazil.
*Author to whom correspondence should be addressed.
Abstract
Aim: Little is known about the biomechanical behavior of disocclusion patterns in implant-supported prostheses. Thus, the aim of the present study was to analyze the stresses generated at bone-implant interface during different patterns of disocclusion in an implant-supported lower complete denture without free distal ends using the three-dimensional (3-D) finite element method.
Study Design: Finite element method.
Methods: A 3-D model of a complete denture supported by five inter-foraminal implants and two distal was developed (CAE software Abaqus). A canine guide disocclusion (CG) was simulated applying a nodal load of 15 N at an angle of 45° on the canine tooth prosthesis, while to a bilateral balanced occlusion (BBO) a similar load pattern was applied at four distinct points, bilaterally. Linear elastic static analysis was used to compare the magnitude of maximum and minimum principal stresses at bone-implant interface for each simulation.
Results: The disocclusion pattern generated during CG exhibited a greater stress concentration at the bone-implant interface of the distal implant on the working side. BBO showed a more homogeneous stress distribution pattern at the bone-implant interface of the two distal implants. Anterior implants showed lower stress concentration.
Conclusions: Bilateral balanced occlusion (BBO) resulted in a more favorable stress distribution in this complete implant-supported prosthesis model.
Keywords: Dental occlusion, dental implant, biomechanics, dental stress analysis