J Adv Prosthodont.  2019 Aug;11(4):209-214. 10.4047/jap.2019.11.4.209.

Effect of different coloring liquids on the flexural strength of multilayered zirconia

  • 1Department of Dental Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea. mgpark@cup.ac.kr


The purpose of this study was to evaluate the effect of two coloring liquids (aqueous and acid-based coloring liquids) and the position of multilayered zirconia on the flexural strength of multilayered zirconia.
The multilayered zirconia specimens were divided into upper and lower positions. The specimens were divided into three subgroups (n=10): non-shaded, acid-based coloring liquid, and aqueous coloring liquid. The specimens were cut using a milling machine and were immersed in either a acid-based coloring liquid or aqueous coloring liquid 2 times for 5 seconds. The specimens were sintered in a sintering furnace according to the manufacturer's introduction. The flexural strength of the specimen was measured using a universal testing machine and the surface of the specimen was observed using a field emission scanning electron microscope.
The flexural strength of multilayered zirconia was 400 - 500 MPa. There was no statistically significant difference among all groups (P>.05).The flexural strength of the multilayered zirconia was not influenced by the kind of coloring liquid used (P>.05). The flexural strength of the multilayered zirconia colored with the coloring liquids was not influenced by its position (P>.05).
The different coloring liquid application did not affect the flexural strength of multilayered zirconia of all positions.


Multilayered zirconia; Coloring liquid; Flexural strength


  • Fig. 1 The upper and lower layer of multilayered zirconia.

  • Fig. 2 Field emission scanning election micrograph images of multilayered zirconia specimens (3M Lava Esthetic). (A) ZU, non-shaded, upper; (B) ZL, non-shaded, lower; (C) KU, acid-based coloring liquid, upper; (D) KL, acid-based coloring liquid, lower; (E) AU, aqueous coloring liquid, upper; (F) AL, aqueous coloring liquid, lower. (Orignal magnification, × 20,000)


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