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Title: 0513 - Novel Multi-component and True-scale 3D Modeling of Human Maxillary Premolar

Authors:

Chalida Limjeerajarus (Presenter)
Chulalongkorn University

Phetcharat Dhammayannarangsi, Thai-Nichi Institute of Technology
Anon Phanijjiva, Thai-Nichi Institute of Technology
Pavita Tangsripongkul, Chulalongkorn University
Thanomsuk Jearanaiphaisarn, Chulalongkorn University
Pisha Pittayapat, Chulalongkorn University
Nuttapol Limjeerajarus, Thai-Nichi Institute of Technology

Abstract:

Objectives: This study aims to develop a new method in creating a multi-component and true-scale 3D model of a human maxillary premolar based on cone-beam computed tomography (CBCT) scan images.

Methods: The premolar tooth model was reconstructed from a patient’s CBCT images. The 2D serial sections were imported into ANSYS software, in which the borders of enamel, dentin, and dental pulp were identified. The 2D borders were overlaid and blended to create the 3D model. Afterward, the model was imported into a numerical software for FEA. Model validation was carried out via the comparison of the ultimate compressive force (UF) obtained from simulation and experiments by universal testing machine. The simulations of three missing-component cases (periodontal ligament (PDL) or silicone, cementum, and both of them were omitted) were also performed.

Results: From the simulation, the ultimate force (UF) of the tooth model was 597 N, contributing to a max principal stress of 384.3 MPa, which just exceeded the ultimate strength of the enamel of 384 MPa. The UF leading to tooth fracture in vitro was 582 ± 133 N. The discrepancy between the UF obtained from the experiments and the simulation was 2.6 %. Interestingly, the PDL/silicone-missing cases showed a significant change in max. principal stress, whereas there was no notable change in the cementum-missing case.

Conclusions: This study, for the first time, developed the realistic multi-component 3D model for predicting force distribution in human tooth. The difference in the UF obtained from in vitro fracture testing and the simulation was < 3%, while a missing component simulation could lead to a higher error value of 32%. These results indicated the importance of multi-component modeling method in FEA, which would be applicable to evaluate and avoid mechanical failure in prosthodontics or endodontic treatments in a more precisive manner.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE

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