TY - JOUR
T1 - Edge chipping of translucent zirconia
AU - Flask, Joseph D.
AU - Thompson, Geoffrey A.
AU - Singh, Maharaj
AU - Berzins, David W.
N1 - Funding Information:
The authors would like to thank Mr Jed Miller and Apex Labs for assistance with material preparation, Dr Sergey Lindeman for assistance with the XRD, and MU Engineering Discovery Learning Laboratory for use of the traveling microscope.
Publisher Copyright:
© 2021 Editorial Council for the Journal of Prosthetic Dentistry
PY - 2022/5
Y1 - 2022/5
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85100638536&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85100638536&partnerID=8YFLogxK
U2 - 10.1016/j.prosdent.2020.12.009
DO - 10.1016/j.prosdent.2020.12.009
M3 - Article
C2 - 33581865
AN - SCOPUS:85100638536
SN - 0022-3913
VL - 127
SP - 793
EP - 800
JO - Journal of Prosthetic Dentistry
JF - Journal of Prosthetic Dentistry
IS - 5
ER -