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Identification of Stress Fields in a Customized Mandibular Reconstruction Based on a Photoelastic Model

Moreno-Garibaldi, Pablo PhD*; Beltrán-Fernández, Juan-Alfonso PhD; Yescas-Hernandez, Jorge-Arturo PhD*; González-Rebattu, Mauricio PhD; Carrera-Espinoza, Rafael PhD*; Hernández-Gómez, Luis-Héctor PhD; López-Liévano, Daniel-Ramon PhD; Pava-Chipol, Nefi-David PhD; Pava-Chipol, Joel Francisco PhD; Urriolagoitia-Calderon, Guillermo Manuel PhD

doi: 10.1097/SCS.0000000000005901
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Tumors, trauma and infections are the main reasons for subjecting a patient to a bone reconstruction made with the use of bone grafts or prosthetic elements, using for example components such as osteosynthesis plates, meshes and screws for their stabilization.

This study focuses on the photoelastic analysis of a customized prosthesis of the jaw for a patient diagnosed with osteonecrosis. A resin model was manufactured as follows: DICOM files were processed in ScanIP software to obtain an STL file that was used to generate an antagonist model of the healthy section of the jaw using CATIA software, then, models were printed in Acrylonitrile Butadiene Styrene (ABS). Following the resin casting technique, the printed model of the jaw was used to construct a resin model, which is tested to determine its mechanical behavior.

After carrying out the photoelastic analysis, it was found that the assembly process generates stress concentration zones. Here, the stress reaches a maximum value after the application of a bite force of 130.9 N in the premolars. In this study near the premolars, 3 stress concentration zones were identified and overlap of stress fields is reveled.

The results show the importance of planning in the design and assembly process to obtain the best results in the reconstruction, reducing in this way the risk of a surgical reoperation due to problems of rupture or loosening of the prosthesis.

*Universidad de las Américas Puebla, San Andrés Cholula

Unidad Profesional “Adolfo López Mateos,” National Polytechnic Institute

ISSSTE Hospital Regional 1° de Octubre, Mexico City, Mexico.

Address correspondence and reprint requests to Pablo Moreno-Garibaldi, PhD, Universidad de las Americas Puebla, Puebla, Mexico; E-mail: pmg170588@gmail.com

Received 31 January, 2019

Accepted 5 July, 2019

The authors report no conflicts of interest.

Supplemental digital contents are available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (www.jcraniofacialsurgery.com).

© 2019 by Mutaz B. Habal, MD.