J Dent Rehabil Appl Sci.  2021 Sep;37(3):111-122. 10.14368/jdras.2021.37.3.111.

The comparisons of layers and the effect of additional firings on flexural strength and translucency of 5Y-ZP

• Kim HJ
• Shin SY

• KMID: 2525985
• DOI: http://doi.org/10.14368/jdras.2021.37.3.111

Abstract

Purpose
The purpose of this in vitro study was to investigate the flexural strength and translucency of three layers in 5Y-ZP and to assess the effect of additional firings on these properties.
Materials and Methods
Sintered zirconia blocks were sectioned according to three layers : incisal, transition, and body. Disc-shaped specimens were fabricated from each layer. The diameter of specimens was 15.0 mm and each thickness of specimens for biaxial flexural strength test and translucency was 1.2 mm and 1.0 mm. The specimens were classified into subgroups according to the number of firing (0, 1, and 3 times; n = 10/subgroup) and the additional firings were performed under 900°C using a furnace. Biaxial flexural strength and translucency was measured using universal testing machine and uv-vis spectrophotometer. X-ray diffraction (XRD) analysis was used for measurement of the phase identification. Oneway ANOVA, Tukey HSD test were performed (α = 0.05).
Results
There was no significant difference in flexural strength between the three layers (P > 0.05), while there was significant difference in translucency between different layers (P < 0.05). The flexural strength of incisal and transition layer was decreased by the single additional firing, and the three additional firings significantly decreased the flexural strength of three layers. The translucency of layer was decreased by additional firings except the body layer. The XRD patterns of all groups were similar.
Conclusion
Three layers of 5Y-ZP were different only in translucency. Additional firings affected the flexural strength and translucency differently depending on the layers but crystalline phases were not changed.

Keyword

monolithic zirconia; cubic phase; flexural strength; translucency; 5Y-ZP

Figure

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  Fig. 1 The disc-shaped specimens. (A) Translucency test, (B) Biaxial flexural strength test.

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  Fig. 2 The piston-on-three-ball test.

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  Fig. 3 Mean biaxial flexural strength. * denotes significant difference at the level of 0.05.

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  Fig. 4 Mean total transmittance of 555 nm wavelength. * denotes significant difference at the level of 0.05.

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  Fig. 5 Total transmittance spectrum for each layer. IL: Incisal layer, TL: Transition layer, BL: Body layer.

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  Fig. 6 Representative XRD patterns of 5Y-ZP. (A) Incisal layer groups, (B) Transition layer groups, (C) Body layer groups.

Reference

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