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. 2021 Dec 23;13(12):e20640.
doi: 10.7759/cureus.20640. eCollection 2021 Dec.

Fracture Resistance of Monolithic High-Translucency Crowns Versus Porcelain-Veneered Zirconia Crowns After Artificial Aging: An In Vitro Study

Yousef Ezzat  1 , Rayan Sharka  2 , Mohammad Rayyan  1 , Mohammed Al-Rafee  1
Affiliations

Fracture Resistance of Monolithic High-Translucency Crowns Versus Porcelain-Veneered Zirconia Crowns After Artificial Aging: An In Vitro Study

Yousef Ezzat et al. Cureus. .

Abstract

Purpose To evaluate the fracture resistance and fracture mode of high-translucency monolithic zirconia (HTZ) crowns and porcelain-veneered zirconia (PVZ) crowns. Material and methods A master die was scanned to design and fabricate the HTZ group (n = 10) and PVZ group (n = 10). Both groups were artificially aged before loaded to fracture. The means of fracture loads of the two groups were compared using an independent t-test at a significance level of 0.05. The mode of fracture was determined using a digital magnifier. Results The mean fracture strength for the HTZ group (4,425 ± 177 newtons (N)) was significantly higher than in the PVZ group (1,798 ± 30.9 N) (p-value < 0.001). All crowns in the HTZ group presented core fracture mode. However, crowns in the PVZ group showed both a core and adhesive fracture mode of 60% and 40%, respectively. Conclusion The fracture strength of HTZ crowns is superior to PVZ crowns. The fracture strength of both types surpassed the maximum bite force in the posterior region, which may be deemed clinically adequate.

Keywords: computer-aided design/computer-assisted manufacture (cad/cam); digital dentistry; fixed prosthodontics; fracture resistance; high-translucency monolithic zirconia (htz); porcelain-veneered zirconia (pvz); zirconia.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Zirconia coping on the metal die
Figure 2
Figure 2. Monolithic high-translucency Y-TZP crowns (HTZ group)
HTZ: high-translucency monolithic zirconia; Y-TZP: yttria-tetragonal zirconia polycrystal
Figure 3
Figure 3. Fracture resistance loads in the samples from both HTZ and PVZ groups
HTZ: high-translucency monolithic zirconia; N: newtons; PVZ: porcelain-veneered zirconia
Figure 4
Figure 4. Samples of fracture mode
A: core fracture; B: adhesive fracture
See this image and copyright information in PMC

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