Effect of artificial aging on high translucent dental zirconia: simulation of early failure

Higher yttria content enhances the translucency and appearance of dental zirconia materials. Alterations in material composition also affect mechanical properties. The aim of this study was to compare the fracture load after artificial short‐term aging of monolithic, full‐contour zirconia crowns wit...

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Bibliographic Details
Published in:European journal of oral sciences 2020-12, Vol.128 (6), p.526-534
Main Authors: Skjold, Anneli, Schriwer, Christian, Gjerdet, Nils R., Øilo, Marit
Format: Article
Language:English
Subjects:
Aging
Aging (artificial)
Ceramics
Chamfering
Composite materials
crown dental
Crowns
Cyclic loads
Damage tolerance
dental ceramics
Dental materials
Dental Porcelain
Dental Prosthesis Design
Dental Restoration Failure
Dental restorative materials
Dental Stress Analysis
Dentistry
fatigue
Fractures
Materials Testing
Mechanical properties
monolithic
prosthodontics
Yttrium oxide
Zirconia
Zirconium
Zirconium dioxide
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Summary:Higher yttria content enhances the translucency and appearance of dental zirconia materials. Alterations in material composition also affect mechanical properties. The aim of this study was to compare the fracture load after artificial short‐term aging of monolithic, full‐contour zirconia crowns with different amounts of yttria‐stabilization. Sixty crowns (thirty super high translucent crowns (5Y‐Z) and thirty high translucent crowns (3Y‐Z)) were produced to fit a model of a premolar with a shallow chamfer preparation. The crowns were cemented with self‐adhesive resin cement on composite abutments. For each zirconia type, three groups of crowns (n = 10) were allocated to: (i) cyclic loading (200 N, 1 Hz, 30,000 cycles), (ii) hydrothermal aging (3 × 20 min, 134°C 3.2 bar), or (iii) no treatment (control). Surviving crowns from the aging process were quasistatically loaded until fracture. The 3Y‐Z crowns had statistically significantly higher fracture values (3,449 N) than the 5Y‐Z crowns (1,938 N). The aging procedures did not affect load at fracture. Fractographic analysis showed that fractures started either at the crown margin or at the occlusal intaglio area. Higher yttria content leads to a reduction in material strength and damage tolerance, and this should be reflected in recommendations for clinical use.
ISSN:0909-8836
1600-0722
DOI:10.1111/eos.12739