RESEARCH PAPER
Optimisation of the length of posts used in the post and core procedure on the basis of strength tests
1
Department of Prosthetic Dentistry and Orthodontics, Jagiellonian University Medical College, Institute of Dentistry, Polska
2
Department of Integrated Dentistry, Jagiellonian University Medical College, Institute of Dentistry, Polska
Submission date: 2023-07-31
Final revision date: 2023-11-29
Acceptance date: 2023-11-29
Publication date: 2023-12-15
Corresponding author
Wojciech Ignacy Ryniewicz
Department of Prosthetic Dentistry and Orthodontics, Jagiellonian University Medical College, Institute of Dentistry, Montelupich 4 str, 31-155, Krakow, Polska
Department of Prosthetic Dentistry and Orthodontics, Jagiellonian University Medical College, Institute of Dentistry, Montelupich 4 str, 31-155, Krakow, Polska
Prosthodontics 2023;73(4):299-306
KEYWORDS
TOPICS
ABSTRACT
Background:
The post and core procedure is used to reconstruct the tooth stroma. Mold posts reflect the configuration of the prepared canal. There are aspects that determine the strength of the tooth restored with a post.
Aim:
The aim of this work was to optimize the length of the root part of the posts on the basis of in vitro strength tests.
Material and methods:
The study material included incisors of the maxilla extracted due to periodontal and orthodontal indications, which were reinforced with individual posts made of Co-Cr and restored using prosthetic crowns made of Co-Cr alloy. The first experimental test method involved compression tests using the Instron 8520 strength machine. The second study method involved numerical modelling (based on microcomputer tomography) and strength analysis using finite elements method.
Results:
The test results have confirmed that the highest destructive force values were achieved for the restored teeth using the longest posts. In a simulation, the maps of the distribution of stress under the influence of occlusion forces were determined.
Conclusions:
The finite element method makes it possible to compare and optimise the length of posts used in the post and core procedure (the optimal length of the post root part is approximately 2/3 of the root length). Periodontium absorbs the transfers caused by chewing forces, and stress provides a compressive physiological stimulus to the alveolar process.
The post and core procedure is used to reconstruct the tooth stroma. Mold posts reflect the configuration of the prepared canal. There are aspects that determine the strength of the tooth restored with a post.
Aim:
The aim of this work was to optimize the length of the root part of the posts on the basis of in vitro strength tests.
Material and methods:
The study material included incisors of the maxilla extracted due to periodontal and orthodontal indications, which were reinforced with individual posts made of Co-Cr and restored using prosthetic crowns made of Co-Cr alloy. The first experimental test method involved compression tests using the Instron 8520 strength machine. The second study method involved numerical modelling (based on microcomputer tomography) and strength analysis using finite elements method.
Results:
The test results have confirmed that the highest destructive force values were achieved for the restored teeth using the longest posts. In a simulation, the maps of the distribution of stress under the influence of occlusion forces were determined.
Conclusions:
The finite element method makes it possible to compare and optimise the length of posts used in the post and core procedure (the optimal length of the post root part is approximately 2/3 of the root length). Periodontium absorbs the transfers caused by chewing forces, and stress provides a compressive physiological stimulus to the alveolar process.
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| eISSN: | 2391-601X |
| ISSN: | 0033-1783 |
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