The influence of cantilever length and implant angulation in completely edentulous patients using the finite element analysis and the All-on-four/Fast &amp; Fixed treatment concept – A review of the literature

Mocanu, Raluca-Gabriela; Preoteasa, Cristina Teodora; Meghea, Daniela; Preoteasa, Elena; Florica, Laurentiu-Iulian; Mocanu, Sebastian-Robert

doi:10.37897/rjs.2020.3.2

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“…The FEM allows for the simulation and evaluation of the biomechanical effects which tend to appear in overdentures on implants in the different clinical situations in which there are complications related to implants or prosthodontic restorations [ 24 ]. In this sense, the physical properties of the materials used to create the overdentures, and the loading conditions with occlusal forces, are taken into account [ 25 , 26 , 27 ].…”

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confidence: 99%

The Biomechanical Impact of Loss of an Implant in the Treatment with Mandibular Overdentures on Four Nonsplinted Mini Dental Implants: A Finite Element Analysis

Teodorescu

Preoteasa

et al. 2022

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The aim of this study was to evaluate the biomechanical impact, in terms of stress and displacement, at the level of a mandibular overdenture, on four mini dental implants (MDIs) after the loss of an implant. A three-dimensional virtual model was obtained by scanning the overdenture, and a biomechanical analysis was carried out, using the finite element method (FEM). The displacements of the overdenture and the equivalent von Mises stresses were evaluated using logarithmic scales. In the case of a mandibular overdenture on four MDIs inserted in the interforaminal area, the frontal loading generated the lowest values for the von Mises stresses, and the bilateral loading generated the least displacement when two implants were inserted in the canine area and two in the molar area. The highest von Mises stress was observed during frontal loading in the situation of the mandibular overdenture on four MDIs, two of which were inserted in the canine area and two in the molar area, following the loss of an implant in the canine area. The largest displacement was noted in the mandibular overdenture on four interforaminal MDIs during unilateral loading, following the loss of a distally inserted implant. The FEM analysis showed aspects that correlated with clinical observations, with predictive value. The concentration of von Mises stresses, and the occurrence of some displacements of the prosthodontic restoration, can explain the emergence of some complications in the overdenture’s biodynamics, and the increased risk of fracture. Complications can be prevented by choosing a certain number of implants and a topographical distribution correlated with biomechanical aspects, and by proposing a correct occlusal scheme with optimal functional loading.

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