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In-vitro performance and fracture strength of thin monolithic zirconia crowns

  • Purpose: All-ceramic restorations required extensive tooth preparation. The purpose of this in vitro study was to investigate a minimally invasive preparation and thickness of monolithic zirconia crowns, which would provide sufficient mechanical endurance and strength. Materials and methods: Crowns with thickness of 0.2 mm (group 0.2, n=32) or of 0.5 mm (group 0.5, n=32) were milled from zirconia and fixed with resin-based adhesives (groups 0.2A, 0.5A) or zinc phosphate cements (groups 0.2C, 0.5C). Half of the samples in each subgroup (n=8) underwent thermal cycling and mechanical loading (TCML)(TC: 5℃ and 55℃, 2×3,000 cycles, 2 min/cycle; ML: 50 N, 1.2×106 cycles), while the other samples were stored in water (37℃/24 h). Survival rates were compared (Kaplan-Maier). The specimens surviving TCML were loaded to fracture and the maximal fracture force was determined (ANOVA; Bonferroni; α=.05). The fracture mode was analyzed. Results: In both 0.5 groups, all crowns survived TCML, and the comparison of fracture strength among crowns with and without TCML showed no significant difference (P=.628). Four crowns in group 0.2A and all of the crowns in group 0.2C failed during TCML. The fracture strength after 24 hours of the cemented 0.2 mm-thick crowns was significantly lower than that of adhesive bonded crowns. All cemented crowns provided fracture in the crown, while about 80% of the adhesively bonded crowns fractured through crown and die. Conclusion: 0.5 mm thick monolithic crowns possessed sufficient strength to endure physiologic performance, regardless of the type of cementation. Fracture strength of the 0.2 mm cemented crowns was too low for clinical application.

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Verfasserangaben:Paul WeiglORCiD, Anna Sander, Yanyun Wu, Roland Felber, Hans-Christoph Lauer, Martin Rosentritt
URN:urn:nbn:de:hebis:30:3-465988
DOI:https://doi.org/10.4047/jap.2018.10.2.79
ISSN:2005-7814
ISSN:2005-7806
Pubmed-Id:https://pubmed.ncbi.nlm.nih.gov/29713427
Titel des übergeordneten Werkes (Englisch):The journal of advanced prosthodontics
Verlag:Korean Acad. of Prosthodontics
Verlagsort:Seoul
Dokumentart:Wissenschaftlicher Artikel
Sprache:Englisch
Jahr der Fertigstellung:2018
Datum der Erstveröffentlichung:18.04.2018
Veröffentlichende Institution:Universitätsbibliothek Johann Christian Senckenberg
Datum der Freischaltung:12.06.2018
Freies Schlagwort / Tag:Cementation; Ceramic; Minimal invasive; Monolithic crown; Zirconia
Jahrgang:10
Ausgabe / Heft:2
Seitenzahl:6
Erste Seite:79
Letzte Seite:84
Bemerkung:
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
HeBIS-PPN:435645862
Institute:Medizin / Medizin
DDC-Klassifikation:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Sammlungen:Universitätspublikationen
Lizenz (Deutsch):License LogoCreative Commons - Namensnennung-Nicht kommerziell 3.0