Edge Chipping of Translucent Zirconia

Authors

Joseph D. Flask, Marquette University
Geoffrey A. Thompson, Marquette UniversityFollow
Maharaj Singh, Marquette UniversityFollow
David W. Berzins, Marquette UniversityFollow

Document Type

Article

Publication Date

5-2022

Publisher

Elsevier

Source Publication

The Journal of Prosthetic Dentistry

Source ISSN

0022-3913

Original Item ID

DOI: 10.1016/j.prosdent.2020.12.009

Abstract

Statement of problem

More translucent dental zirconias have been developed by incorporating the cubic phase and reducing the tetragonal phase content that undergoes transformation toughening, leading to reduced mechanical properties. Whether the clinically relevant mechanical property of the edge chipping toughness of the material is also reduced is unclear.

Purpose

The purpose of this in vitro study was to evaluate the edge chipping toughness and translucency of translucent zirconia, 3mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP), and lithium disilicate.

Material and methods

Two translucent zirconia products, Katana and Lava Esthetic; one 3Y-TZP, Lava Plus; and one lithium disilicate, IPS e.max Press were prepared and tested for phase composition via X-ray diffraction (XRD) (n=3), translucency via a spectrophotometer (n=20), and edge chipping via a universal testing machine with a custom-machined specimen holder and diamond indenter (n=20). The 3Y-TZP and lithium disilicate served as the optimal control materials for edge chipping and translucency, respectively. Translucency was compared with 1-way ANOVA and edge toughness with ANCOVA (α=.05).

Results

The XRD showed the 3Y-TZP to be almost completely tetragonal phase compared with the 2 translucent zirconia products that were predominantly cubic. Katana UTML and IPS e.max Press had a statistically similar (P>.05) translucency that was significantly (P<.05) greater than that of Lava Esthetic and Lava Plus. The edge toughness of Katana UTML was 304 N/mm, IPS e.max Press was 354 N/mm, Lava Esthetic was 394 N/mm, and Lava Plus was 717 N/mm, with significance rankings of Katana UTM < IPS e.max Press=Lava Esthetic < Lava Plus.

Conclusions

Some translucent zirconias had translucency similar to that of lithium disilicate; however, as translucency increased with increased cubic content, edge toughness decreased.

Comments

Accepted version. The Journal of Prosthetic Dentistry, Vol. 127, No. 5 (May 2022): 793-800. DOI. © 2022 Elsevier. Used with permission.

Recommended Citation

Flask, Joseph D.; Thompson, Geoffrey A.; Singh, Maharaj; and Berzins, David W., "Edge Chipping of Translucent Zirconia" (2022). School of Dentistry Faculty Research and Publications. 550.
https://epublications.marquette.edu/dentistry_fac/550