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Journal of Technologic Dentistry 2024; 46(1): 15-19

Published online March 30, 2024

https://doi.org/10.14347/jtd.2024.46.1.15

© Korean Academy of Dental Technology

Fabrication of a custom polyetherketoneketone post-and-core with digital technology

Ju-Hyoung Lee1 , Gyu-Heon Lee2

1Department of Predoctoral Clinical Education, School of Dentistry, Kyungpook National University, Daegu, Korea
2F&E Dental Laboratory, Daegu, Korea

Correspondence to :
Ju-Hyoung Lee
Department of Predoctoral Clinical Education, School of Dentistry, Kyungpook National University, 2175 Dalgubeol-daero, Junggu, Daegu 41940, Korea
E-mail: jus2u@knu.ac.kr
https://orcid.org/0000-0003-4201-6580

Received: January 12, 2024; Revised: January 30, 2024; Accepted: February 6, 2024

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An ideal post material should have physical properties similar to those of dentin. Post materials with high elastic moduli may cause root fractures. This clinical report describes the treatment of a severely damaged tooth using a recently introduced material. Polyetherketoneketone (PEKK) is a semicrystalline high-performance thermoplastic polymer. PEKK is a promising material for custom post-and-core fabrication because of its elasticity close to that of dentin, good shock absorbance, machinability, and low cost. A laboratory scanner was used to digitize the conventional impression of a severely damaged maxillary right first molar. A custom PEKK post-and-core was designed and milled using computer-aided design and computer-aided manufacturing technology. Using the proposed technique, a custom PEKK post-and-core was fabricated accurately and human error was reduced. Restoration was luted with resin cement. Custom PEKK post-and-core restorations are a viable alternative for treating severely damaged teeth.

Keywords: Computer-aided design/computer-aided manufacturing, High-performance thermoplastic polymer, Polyetherketoneketone, Post and core technique

Article

Case Report

Journal of Technologic Dentistry 2024; 46(1): 15-19

Published online March 30, 2024 https://doi.org/10.14347/jtd.2024.46.1.15

Copyright © Korean Academy of Dental Technology.

Fabrication of a custom polyetherketoneketone post-and-core with digital technology

Ju-Hyoung Lee1 , Gyu-Heon Lee2

1Department of Predoctoral Clinical Education, School of Dentistry, Kyungpook National University, Daegu, Korea
2F&E Dental Laboratory, Daegu, Korea

Correspondence to:Ju-Hyoung Lee
Department of Predoctoral Clinical Education, School of Dentistry, Kyungpook National University, 2175 Dalgubeol-daero, Junggu, Daegu 41940, Korea
E-mail: jus2u@knu.ac.kr
https://orcid.org/0000-0003-4201-6580

Received: January 12, 2024; Revised: January 30, 2024; Accepted: February 6, 2024

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An ideal post material should have physical properties similar to those of dentin. Post materials with high elastic moduli may cause root fractures. This clinical report describes the treatment of a severely damaged tooth using a recently introduced material. Polyetherketoneketone (PEKK) is a semicrystalline high-performance thermoplastic polymer. PEKK is a promising material for custom post-and-core fabrication because of its elasticity close to that of dentin, good shock absorbance, machinability, and low cost. A laboratory scanner was used to digitize the conventional impression of a severely damaged maxillary right first molar. A custom PEKK post-and-core was designed and milled using computer-aided design and computer-aided manufacturing technology. Using the proposed technique, a custom PEKK post-and-core was fabricated accurately and human error was reduced. Restoration was luted with resin cement. Custom PEKK post-and-core restorations are a viable alternative for treating severely damaged teeth.

Keywords: Computer-aided design/computer-aided manufacturing, High-performance thermoplastic polymer, Polyetherketoneketone, Post and core technique

Fig 1.

Figure 1.Preoperative condition. Extensive coronal destruction of the maxillary right first molar because of caries and fracture is observed.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 2.

Figure 2.Conventional impression with polyvinyl siloxane material.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 3.

Figure 3.Impression scan. (A) Virtual image of post space, occlusal view. (B) Virtual image of post space, apical view.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 4.

Figure 4.Computer-aided design of a custom post-and-core.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 5.

Figure 5.Milled custom PEKK post-and-core. PEKK: polyetherketoneketone.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 6.

Figure 6.Evaluation of milled post and core with polyvinyl siloxane material.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 7.

Figure 7.Custom PEKK post-and-core in place. PEKK: polyetherketoneketone.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

Fig 8.

Figure 8.Milled definitive crown in place.
Journal of Technologic Dentistry 2024; 46: 15-19https://doi.org/10.14347/jtd.2024.46.1.15

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