IADR Abstract Archives
Wear Resistance of Multilayered Monolithic Zirconia Ceramics
Objectives: To evaluate two-body wear of two pre-colored highly translucent multilayer monolithic zirconia ceramics, which were colored using two different techniques.
Methods: Two pre-sintered 5 mol% yttria partially stabilized zirconia (5Y-PSZ) disks (Lava Esthetic A2, 3M Oral Care; Katana STML A2, Kuraray Noritake) were cut in plates, sintered according to the manufacturer’s instructions and mirror-polished. The pigment composition and distribution were thoroughly evaluated by light and fluorescence microscopy, electron probe micro-analyzer (EPMA) with WDS and nano-SEM with energy-dispersive X-ray spectroscopy (EDX). Chemical and phase composition were assessed using X-ray fluorescence (XRF) and X-ray diffraction (XRD) along with electron backscatter diffraction (EBSD), respectively. Samples were then loaded in the chewing simulator (5 kg vertical load, 2.1 Hz) in water of 5-55 °C for 800 000 cycles against steatite antagonists. Wear tracks on the zirconia ceramics were scanned with a non-contact 3D laser profilometer and super-impositions were used to determine wear loss of the antagonists. Wear surfaces were analyzed by nano-SEM.
Results: Pigments in Lava Esthetic were seen as large yellow and blue, fluorescent agglomerates consisting of small grains (0.54 µm and 0.36 µm, versus 0.86 µm for the surrounding grains) with a lower Y2O3 content and the presence of Er, Hf and Al. The coloring agglomerates however were not observed in Katana STML. Nevertheless, Lava Esthetic and Katana STML showed similar wear trend and similar amount of wear. Laser profilometry confirmed that both ceramics worn similarly (≈ 19 µm in depth). While abrasive wear without obvious cracks was seen in both zirconia ceramics, limited amounts of monoclinic zirconia were detected in the worn surfaces. Lava Esthetics was characterized with transformation degradation occurring exclusively within the pigment agglomerates. Furthermore, no significant differences in antagonist wear were found between both Lava Esthetic and Katana STML (4.62±0.11 and 4.68±0.09 mm3, respectively).
Conclusions: In the context of this study, Lava Esthetic and Katana STML, although being colored using different techniques, showed similar wear behaviors.
Methods: Two pre-sintered 5 mol% yttria partially stabilized zirconia (5Y-PSZ) disks (Lava Esthetic A2, 3M Oral Care; Katana STML A2, Kuraray Noritake) were cut in plates, sintered according to the manufacturer’s instructions and mirror-polished. The pigment composition and distribution were thoroughly evaluated by light and fluorescence microscopy, electron probe micro-analyzer (EPMA) with WDS and nano-SEM with energy-dispersive X-ray spectroscopy (EDX). Chemical and phase composition were assessed using X-ray fluorescence (XRF) and X-ray diffraction (XRD) along with electron backscatter diffraction (EBSD), respectively. Samples were then loaded in the chewing simulator (5 kg vertical load, 2.1 Hz) in water of 5-55 °C for 800 000 cycles against steatite antagonists. Wear tracks on the zirconia ceramics were scanned with a non-contact 3D laser profilometer and super-impositions were used to determine wear loss of the antagonists. Wear surfaces were analyzed by nano-SEM.
Results: Pigments in Lava Esthetic were seen as large yellow and blue, fluorescent agglomerates consisting of small grains (0.54 µm and 0.36 µm, versus 0.86 µm for the surrounding grains) with a lower Y2O3 content and the presence of Er, Hf and Al. The coloring agglomerates however were not observed in Katana STML. Nevertheless, Lava Esthetic and Katana STML showed similar wear trend and similar amount of wear. Laser profilometry confirmed that both ceramics worn similarly (≈ 19 µm in depth). While abrasive wear without obvious cracks was seen in both zirconia ceramics, limited amounts of monoclinic zirconia were detected in the worn surfaces. Lava Esthetics was characterized with transformation degradation occurring exclusively within the pigment agglomerates. Furthermore, no significant differences in antagonist wear were found between both Lava Esthetic and Katana STML (4.62±0.11 and 4.68±0.09 mm3, respectively).
Conclusions: In the context of this study, Lava Esthetic and Katana STML, although being colored using different techniques, showed similar wear behaviors.