Objective: Determine the biaxial flexure strength of yttria partially stabilized zirconia colored with various solutions.

Methods: LAVA (3M/ESPE) and YZ Ceram (Vita Zahnfabrik) yttria partially stabilized zirconia were sectioned into discs approximately 3 mm thick using a diamond saw and sintered according to the manufacturer’s instructions in the recommended furnace. Ten discs per group of uncolored Lava, colored LAVA (4 shades), uncolored YZ, and YZ subjected to various color applications were tested in biaxial flexure. Colored LAVA specimens were fabricated at an approved dental laboratory. YZ specimens were colored using the manufacturer’s supplied solution for different immersion times or surface application. The biaxial flexure strength of the samples were tested using an Instron at a crosshead speed of 0.5 mm/min.

Results:

Biaxial Flexural Strength

Material	Strength(MPa)
LAVA Control	981.6 ± 83.2
LAVA Shade 1	969.8 ± 98.0
LAVA Shade 2	960.7 ± 67.1
LAVA Shade 3	990.9 ± 75.0
LAVA Shade 4	1020.4 ± 89.7
YZ Control	978.5 ± 52.2
YZ Colorant, 4 coats	1038.3 ± 85.9
YZ Colorant, 6 coats	992.2 ± 16.2
YZ Colorant, 8 coats	997.3 ± 62.7
YZ Colorant, 2 min immersion	950.4 ± 78.4
YZ Colorant, 4 min immersion	971.8 ± 30.4

Using ANOVA and Tukey tests, there is no significant difference in strength values at probability of p < 0.05.

Conclusion: The use of solutions to color various zirconia framework materials does not significantly affect flexural strength.

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