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. 2023 Feb 15;14(2):108.
doi: 10.3390/jfb14020108.

Structural Integrity of Anterior Ceramic Resin-Bonded Fixed Partial Denture: A Finite Element Analysis Study

Mas Linda Mohd Osman  1 , Tong Wah Lim  2 , Hung-Chih Chang  3 , Amir Radzi Ab Ghani  4 , James Kit Hon Tsoi  5 , Siti Mariam Ab Ghani  1
Affiliations

Structural Integrity of Anterior Ceramic Resin-Bonded Fixed Partial Denture: A Finite Element Analysis Study

Mas Linda Mohd Osman et al. J Funct Biomater. .

Abstract

This study was conducted as a means to evaluate the stress distribution patterns of anterior ceramic resin-bonded fixed partial dentures derived from different materials and numerous connector designs that had various loading conditions imposed onto them through the utilization of the finite element method. A finite element model was established on the basis of the cone beam computed tomography image of a cantilevered resin-bonded fixed partial denture with a central incisor as an abutment and a lateral incisor as a pontic. Sixteen finite element models representing different conditions were simulated with lithium disilicate and zirconia. Connector height, width, and shape were set as the geometric parameters. Static loads of 100 N, 150 N, and 200 N were applied at 45 degrees to the pontic. The maximum equivalent stress values obtained for all finite element models were compared with the ultimate strengths of their materials. Higher load exhibited greater maximum equivalent stress in both materials, regardless of the connector width and shape. Loadings of 200 N and 150 N that were correspondingly simulated on lithium disilicate prostheses of all shapes and dimensions resulted in connector fractures. On the contrary, loadings of 200 N, 150 N, and 100 N with rectangular-shaped connectors correspondingly simulated on zirconia were able to withstand the loads. However, two of the trapezoidal-shaped zirconia connectors were unable to withstand the loads and resulted in fractures. It can be deduced that material type, shape, and connector dimensions concurrently influenced the integrity of the bridge.

Keywords: finite elemental analysis; lithium disilicate; resin-bonded fixed partial denture; zirconia.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
Tooth setup.
Figure 2
Figure 2
Tooth preparation (margins in dotted lines).
Figure 3
Figure 3
Prostheses.
Figure 4
Figure 4
Combined master model that consists of the retainer on the central incisor and the pontic tooth (lateral incisor). The connector is marked by an arrow.
Figure 5
Figure 5
Cone beam computed tomography (CS 3D imaging) of (a) axial view; (b) 3D image; (c) coronal view; (d) sagittal view.
Figure 6
Figure 6
(a) Imaged layers of the model. (b) The configuration and the boundary conditions of the FE model.
Figure 7
Figure 7
Rectangular and trapezoidal-shaped connector cross-section.
Figure 8
Figure 8
Intracomparison of rectangular vs. trapezoidal connector response from zirconia subjected to 200 N, 150 N, and 100 N load. The orange line indicates the level of flexural strength of zirconia at 1200 MPa. The area above the line indicates the maximum equivalent stress (MES) above 1200 MPa and the material will not survive. The connector volume is stated above the graph in mm3.
Figure 9
Figure 9
Intra-comparison of rectangular vs. trapezoidal connector response made from lithium disilicate subjected to 200 N, 150 N, and 100 N load. The orange line indicates the level of flexural strength of lithium disilicate at 460 MPa. The area above the line indicates the maximum equivalent stress (MES) above 460 MPa and the material will not survive. The connector volume is stated above the graph in mm3.
Figure 10
Figure 10
Intercomparison between the rectangular-shaped connectors made from lithium disilicate and zirconia to subjected to 200 N, 150 N, and 100 N load.
Figure 11
Figure 11
Intercomparison between the trapezoidal-shaped connectors made from lithium disilicate and zirconia subjected to 200 N, 150 N, and 100 N load.
Figure 12
Figure 12
Stress distribution for the FE model.
Figure 13
Figure 13
Stress distribution of the FE models of different connector shapes and dimensions.
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