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Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access

This study analyzed the fracture load before and after a chewing simulation of zirconia crowns that were trepanned and repaired using composite resin. Overall, 3 groups with 15 5Y-PSZ crowns in each group were tested. For group A, the fracture load of the unmodified crowns was evaluated. For group B...

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Autores principales: Greuling, Andreas, Wiemken, Mira, Kahra, Christoph, Maier, Hans Jürgen, Eisenburger, Michael
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10047223/
https://www.ncbi.nlm.nih.gov/pubmed/36975573
http://dx.doi.org/10.3390/dj11030076
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author Greuling, Andreas
Wiemken, Mira
Kahra, Christoph
Maier, Hans Jürgen
Eisenburger, Michael
author_facet Greuling, Andreas
Wiemken, Mira
Kahra, Christoph
Maier, Hans Jürgen
Eisenburger, Michael
author_sort Greuling, Andreas
collection PubMed
description This study analyzed the fracture load before and after a chewing simulation of zirconia crowns that were trepanned and repaired using composite resin. Overall, 3 groups with 15 5Y-PSZ crowns in each group were tested. For group A, the fracture load of the unmodified crowns was evaluated. For group B, the crowns were trepanned and repaired using composite resin, also followed by a fracture test. For group C, crowns were prepared like in group B but received thermomechanical cycling before the final fracture tests. Furthermore, scanning electron microscopy (SEM) and X-ray microscopy (XRM) analysis were performed for group C. The mean fracture loads and standard deviation were 2260 N ± 410 N (group A), 1720 N ± 380 N (group B), and 1540 N ± 280 N (group C). Tukey-Kramer multiple comparisons showed a significant difference between groups A and B (p < 0.01) and groups A and C (p < 0.01). After ageing, surface fissures were detected via SEM, but no cracks that reached from the occlusal to the inner side of the crown were detected via XRM. Within the limitations of this study, it can be stated that trepanned and composite-repaired 5Y-PSZ crowns show lower fracture loads than 5Y-PSZ crowns without trepanation.
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spelling pubmed-100472232023-03-29 Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access Greuling, Andreas Wiemken, Mira Kahra, Christoph Maier, Hans Jürgen Eisenburger, Michael Dent J (Basel) Article This study analyzed the fracture load before and after a chewing simulation of zirconia crowns that were trepanned and repaired using composite resin. Overall, 3 groups with 15 5Y-PSZ crowns in each group were tested. For group A, the fracture load of the unmodified crowns was evaluated. For group B, the crowns were trepanned and repaired using composite resin, also followed by a fracture test. For group C, crowns were prepared like in group B but received thermomechanical cycling before the final fracture tests. Furthermore, scanning electron microscopy (SEM) and X-ray microscopy (XRM) analysis were performed for group C. The mean fracture loads and standard deviation were 2260 N ± 410 N (group A), 1720 N ± 380 N (group B), and 1540 N ± 280 N (group C). Tukey-Kramer multiple comparisons showed a significant difference between groups A and B (p < 0.01) and groups A and C (p < 0.01). After ageing, surface fissures were detected via SEM, but no cracks that reached from the occlusal to the inner side of the crown were detected via XRM. Within the limitations of this study, it can be stated that trepanned and composite-repaired 5Y-PSZ crowns show lower fracture loads than 5Y-PSZ crowns without trepanation. MDPI 2023-03-07 /pmc/articles/PMC10047223/ /pubmed/36975573 http://dx.doi.org/10.3390/dj11030076 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Greuling, Andreas
Wiemken, Mira
Kahra, Christoph
Maier, Hans Jürgen
Eisenburger, Michael
Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access
title Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access
title_full Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access
title_fullStr Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access
title_full_unstemmed Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access
title_short Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access
title_sort fracture resistance of repaired 5y-psz zirconia crowns after endodontic access
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10047223/
https://www.ncbi.nlm.nih.gov/pubmed/36975573
http://dx.doi.org/10.3390/dj11030076
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