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. 2017:2017:1373127.
doi: 10.1155/2017/1373127. Epub 2017 Mar 12.

Biomechanical Evaluation of a Tooth Restored with High Performance Polymer PEKK Post-Core System: A 3D Finite Element Analysis

Ki-Sun Lee  1 , Joo-Hee Shin  2 , Jong-Eun Kim  3 , Jee-Hwan Kim  3 , Won-Chang Lee  4 , Sang-Wan Shin  1 , Jeong-Yol Lee  1
Affiliations

Biomechanical Evaluation of a Tooth Restored with High Performance Polymer PEKK Post-Core System: A 3D Finite Element Analysis

Ki-Sun Lee et al. Biomed Res Int. 2017.

Erratum in

Abstract

The aim of this study was to evaluate the biomechanical behavior and long-term safety of high performance polymer PEKK as an intraradicular dental post-core material through comparative finite element analysis (FEA) with other conventional post-core materials. A 3D FEA model of a maxillary central incisor was constructed. A cyclic loading force of 50 N was applied at an angle of 45° to the longitudinal axis of the tooth at the palatal surface of the crown. For comparison with traditionally used post-core materials, three materials (gold, fiberglass, and PEKK) were simulated to determine their post-core properties. PEKK, with a lower elastic modulus than root dentin, showed comparably high failure resistance and a more favorable stress distribution than conventional post-core material. However, the PEKK post-core system showed a higher probability of debonding and crown failure under long-term cyclic loading than the metal or fiberglass post-core systems.

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Figures

Figure 1
Figure 1
Components of constructed geometry models. (a) Post and core integrated model for simulating gold alloy post-core system and PEKK post-core system. (b) Post and core separated model for simulating prefabricated fiberglass post and resin core.
Figure 2
Figure 2
(a) Sagittal sections view of the finite element mesh of assembled post-core restored tooth model. (b) Sagittal section views of the boundary and loading conditions of the geometry model.
Figure 3
Figure 3
Sagittal section views for stress distribution of components in the study models (a). Maximum von Misses stress values of each component in the study models (b).
Figure 4
Figure 4
Coronal section views of VME stress distribution profile at the labial side interface surface of dentine and post cement along the root mid-plane. Distances are measured from the cervical region of the post to its apex.
Figure 5
Figure 5
Sagittal section views of FOS distribution of each component in the study models (a). Minimum FOS of each component in the study models (b).
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