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An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics
OBJECTIVES: To evaluate and compare fracture resistance, translucency, and color reproducibility, as well as the effect of aging on the fracture load and color stability of novel monolithic CAD/CAM ceramics. MATERIALS AND METHODS: One hundred crowns of uniform thickness were milled from five ceramic...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10264477/ https://www.ncbi.nlm.nih.gov/pubmed/36574045 http://dx.doi.org/10.1007/s00784-022-04833-y |
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author | Fouda, Ahmed Mahmoud Atta, Osama Özcan, Mutlu Stawarczyk, Bogna Glaum, Robert Bourauel, Christoph |
author_facet | Fouda, Ahmed Mahmoud Atta, Osama Özcan, Mutlu Stawarczyk, Bogna Glaum, Robert Bourauel, Christoph |
author_sort | Fouda, Ahmed Mahmoud |
collection | PubMed |
description | OBJECTIVES: To evaluate and compare fracture resistance, translucency, and color reproducibility, as well as the effect of aging on the fracture load and color stability of novel monolithic CAD/CAM ceramics. MATERIALS AND METHODS: One hundred crowns of uniform thickness were milled from five ceramic blocks (n = 20): partially crystallized lithium disilicate (PLD) and fully crystallized lithium disilicate (FLD), lithium metasilicate (LMS), 4Y-TZP (SMZ), and 5Y-TZP (UMZ) monolithic zirconia. PLD crowns were glazed, LMS was fired, and FLD was polished. SMZ and UMZ crowns were sintered and polished. Crowns were adhesively cemented to epoxy dies. Half of the crowns (n = 10) were subjected to 1.200.000 load cycles with thermal cycling. Color space values L, a, b defined by the Commission Internationale de l´Eclairage (CIELAB) were measured before and after aging, and (∆E) was calculated. Both aged and non-aged specimens were loaded until fracture in a universal testing machine and the fracture load was recorded. X-ray diffraction (XRD) and scanning electron microscope (SEM) fractographic analysis were carried out on fractured fragments of representative samples. For translucency and color reproducibility, 50 rectangular-shaped specimens were fabricated and processed as described previously. Color values were measured over black and white backgrounds, and the translucency parameter (TP) was computed. Using the shade verification mode, (∆E) to shade A3 was calculated. Data were statistically analyzed using one-way and two-way ANOVA, and t-test. RESULTS: Aging did not affect fracture resistance significantly (p > 0.05). The highest mean fracture load was obtained for the SMZ and UMZ. A significant color change was observed after aging in all groups. The highest TP was noted for FLD. SMZ and UMZ had the best shade match. CONCLUSIONS: Zirconia showed higher fracture resistance and color stability than lithium silicate ceramics. Lithium silicate ceramics were more translucent. The experimental FLD demonstrated high translucency. CLINICAL RELEVANCE: Tested ceramics showed sufficient stability to withstand masticatory forces. Characterization of final restorations might be mandatory for better color match. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00784-022-04833-y. |
format | Online Article Text |
id | pubmed-10264477 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-102644772023-06-15 An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics Fouda, Ahmed Mahmoud Atta, Osama Özcan, Mutlu Stawarczyk, Bogna Glaum, Robert Bourauel, Christoph Clin Oral Investig Research OBJECTIVES: To evaluate and compare fracture resistance, translucency, and color reproducibility, as well as the effect of aging on the fracture load and color stability of novel monolithic CAD/CAM ceramics. MATERIALS AND METHODS: One hundred crowns of uniform thickness were milled from five ceramic blocks (n = 20): partially crystallized lithium disilicate (PLD) and fully crystallized lithium disilicate (FLD), lithium metasilicate (LMS), 4Y-TZP (SMZ), and 5Y-TZP (UMZ) monolithic zirconia. PLD crowns were glazed, LMS was fired, and FLD was polished. SMZ and UMZ crowns were sintered and polished. Crowns were adhesively cemented to epoxy dies. Half of the crowns (n = 10) were subjected to 1.200.000 load cycles with thermal cycling. Color space values L, a, b defined by the Commission Internationale de l´Eclairage (CIELAB) were measured before and after aging, and (∆E) was calculated. Both aged and non-aged specimens were loaded until fracture in a universal testing machine and the fracture load was recorded. X-ray diffraction (XRD) and scanning electron microscope (SEM) fractographic analysis were carried out on fractured fragments of representative samples. For translucency and color reproducibility, 50 rectangular-shaped specimens were fabricated and processed as described previously. Color values were measured over black and white backgrounds, and the translucency parameter (TP) was computed. Using the shade verification mode, (∆E) to shade A3 was calculated. Data were statistically analyzed using one-way and two-way ANOVA, and t-test. RESULTS: Aging did not affect fracture resistance significantly (p > 0.05). The highest mean fracture load was obtained for the SMZ and UMZ. A significant color change was observed after aging in all groups. The highest TP was noted for FLD. SMZ and UMZ had the best shade match. CONCLUSIONS: Zirconia showed higher fracture resistance and color stability than lithium silicate ceramics. Lithium silicate ceramics were more translucent. The experimental FLD demonstrated high translucency. CLINICAL RELEVANCE: Tested ceramics showed sufficient stability to withstand masticatory forces. Characterization of final restorations might be mandatory for better color match. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00784-022-04833-y. Springer Berlin Heidelberg 2022-12-27 2023 /pmc/articles/PMC10264477/ /pubmed/36574045 http://dx.doi.org/10.1007/s00784-022-04833-y Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Research Fouda, Ahmed Mahmoud Atta, Osama Özcan, Mutlu Stawarczyk, Bogna Glaum, Robert Bourauel, Christoph An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics |
title | An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics |
title_full | An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics |
title_fullStr | An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics |
title_full_unstemmed | An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics |
title_short | An investigation on fatigue, fracture resistance, and color properties of aesthetic CAD/CAM monolithic ceramics |
title_sort | investigation on fatigue, fracture resistance, and color properties of aesthetic cad/cam monolithic ceramics |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10264477/ https://www.ncbi.nlm.nih.gov/pubmed/36574045 http://dx.doi.org/10.1007/s00784-022-04833-y |
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