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. 2015:2015:864389.
doi: 10.1155/2015/864389. Epub 2015 Mar 24.

Three-dimensional finite element analysis of anterior two-unit cantilever resin-bonded fixed dental prostheses

Filip Keulemans  1 , Akikazu Shinya  2 , Lippo V J Lassila  3 , Pekka K Vallittu  3 , Cornelis J Kleverlaan  4 , Albert J Feilzer  4 , Roeland J G De Moor  1
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Three-dimensional finite element analysis of anterior two-unit cantilever resin-bonded fixed dental prostheses

Filip Keulemans et al. ScientificWorldJournal. 2015.

Abstract

The aim of this study was to evaluate the influence of different framework materials on biomechanical behaviour of anterior two-unit cantilever resin-bonded fixed dental prostheses (RBFDPs). A three-dimensional finite element model of a two-unit cantilever RBFDP replacing a maxillary lateral incisor was created. Five framework materials were evaluated: direct fibre-reinforced composite (FRC-Z250), indirect fibre-reinforced composite (FRC-ES), gold alloy (M), glass ceramic (GC), and zirconia (ZI). Finite element analysis was performed and stress distribution was evaluated. A similar stress pattern, with stress concentrations in the connector area, was observed in RBFDPs for all materials. Maximal principal stress showed a decreasing order: ZI>M>GC>FRC-ES>FRC-Z250. The maximum displacement of RBFDPs was higher for FRC-Z250 and FRC-ES than for M, GC, and ZI. FE analysis depicted differences in location of the maximum stress at the luting cement interface between materials. For FRC-Z250 and FRC-ES, the maximum stress was located in the upper part of the proximal area of the retainer, whereas, for M, GC, and ZI, the maximum stress was located at the cervical outline of the retainer. The present study revealed differences in biomechanical behaviour between all RBFDPs. The general observation was that a RBFDP made of FRC provided a more favourable stress distribution.

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Figures

Figure 1
Figure 1
3D FE model of a cantilever two-unit RBFDP: (a) abutment and adjacent tooth, (b) cement layer, and (c) RBFDP.
Figure 2
Figure 2
3D FE model of a two-unit cantilever FRC RBFDP: position of the FRC framework in relation to the FDP and the abutment teeth is shown. Double arrowed black line represents the fibre direction.
Figure 3
Figure 3
Loading and boundary conditions of a 3D FE model representing two-unit cantilever RBFDPs.
Figure 4
Figure 4
Principal stress distribution within two-unit cantilever RBFDPs of various framework materials.
Figure 5
Figure 5
Principal stress distribution at the cement-retainer interface for two-unit cantilever RBFDPs of various framework materials.
Figure 6
Figure 6
Principal stress distribution within the cement layer for two-unit cantilever RBFDPs of various framework materials.
Figure 7
Figure 7
Principal stress distribution at the abutment tooth for two-unit cantilever RBFDPs of various framework materials.
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