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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-03-01
|
| Series: | Dentistry Journal |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6767/11/3/76 |
| _version_ | 1797612477383442432 |
|---|---|
| author | Andreas Greuling Mira Wiemken Christoph Kahra Hans Jürgen Maier Michael Eisenburger |
| author_facet | Andreas Greuling Mira Wiemken Christoph Kahra Hans Jürgen Maier Michael Eisenburger |
| author_sort | Andreas Greuling |
| collection | DOAJ |
| 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 (<i>p</i> < 0.01) and groups A and C (<i>p</i> < 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. |
| first_indexed | 2024-03-11T06:41:47Z |
| format | Article |
| id | doaj.art-61a11d3cfa4c40fda4323fdc21a3b6de |
| institution | Directory Open Access Journal |
| issn | 2304-6767 |
| language | English |
| last_indexed | 2024-03-11T06:41:47Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Dentistry Journal |
| spelling | doaj.art-61a11d3cfa4c40fda4323fdc21a3b6de2023-11-17T10:32:24ZengMDPI AGDentistry Journal2304-67672023-03-011137610.3390/dj11030076Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic AccessAndreas Greuling0Mira Wiemken1Christoph Kahra2Hans Jürgen Maier3Michael Eisenburger4Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hannover, GermanyDepartment of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hannover, GermanyInstitut für Werkstoffkunde (Materials Science), Leibniz University Hannover, An der Universität 2, 30823 Garbsen, GermanyInstitut für Werkstoffkunde (Materials Science), Leibniz University Hannover, An der Universität 2, 30823 Garbsen, GermanyDepartment of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hannover, GermanyThis 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 (<i>p</i> < 0.01) and groups A and C (<i>p</i> < 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.https://www.mdpi.com/2304-6767/11/3/76fracture loadrepaired crownszirconiaendodontic accesschewing simulation |
| spellingShingle | Andreas Greuling Mira Wiemken Christoph Kahra Hans Jürgen Maier Michael Eisenburger Fracture Resistance of Repaired 5Y-PSZ Zirconia Crowns after Endodontic Access Dentistry Journal fracture load repaired crowns zirconia endodontic access chewing simulation |
| 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 | fracture load repaired crowns zirconia endodontic access chewing simulation |
| url | https://www.mdpi.com/2304-6767/11/3/76 |
| work_keys_str_mv | AT andreasgreuling fractureresistanceofrepaired5ypszzirconiacrownsafterendodonticaccess AT mirawiemken fractureresistanceofrepaired5ypszzirconiacrownsafterendodonticaccess AT christophkahra fractureresistanceofrepaired5ypszzirconiacrownsafterendodonticaccess AT hansjurgenmaier fractureresistanceofrepaired5ypszzirconiacrownsafterendodonticaccess AT michaeleisenburger fractureresistanceofrepaired5ypszzirconiacrownsafterendodonticaccess |