IADR Abstract Archives
Effect of Airborne-Particle Abrasion on 3d Printed Zirconia
Objectives: The purpose of this study is to determine the effect of airborne-particle abrasion on mechanical properties of 3D printed zirconia (ZrO2).
Methods: The zirconia specimens (2.0x2.0x25.0mm, zirconia (yttria 3%) (n=22) in vertical and (n=31) in horizontal printing orientation were manufactured with a 3D printer (Lithoz, CeraFab 7500). After printing the specimens were carbon-debinded (81.9 h, maximum temperature 500°C) and sintered (time 48.9 h and maximum temperature 1450°C).
The specimens were divided into four groups: surface treated vertical group, surface treated horizontal group, vertical control group and horizontal control group. Surface treated groups were airborne-particle abraded with 50-µm aluminum oxide with 200 kPa pressure.
Specimens were 3-point flexural tested according to ISO 10477. Optical microscopy and scanning electron microscopy (SEM) were used to evaluate fractography. The results were statistically analyzed with ANOVA.
Results: Summary of results are shown in the Table below. Airborne-particle abrasion increased the flexural strength of vertically printed specimens by 34% and horizontal by 19%, which was statistically significant (p<0.05, ANOVA). Printing alignment also had a significant effect (p<0.05) on mechanical properties.
Optical microscopy and SEM revealed that the material is randomly delaminated between the printing layers which also caused the lower flexural strength of the vertically printed specimens. SEM revealed the effect of surface treatment on surface roughness.
Conclusions: Airborne-particle abrasion increased the strength and surface roughness of Zirconia specimens.
Methods: The zirconia specimens (2.0x2.0x25.0mm, zirconia (yttria 3%) (n=22) in vertical and (n=31) in horizontal printing orientation were manufactured with a 3D printer (Lithoz, CeraFab 7500). After printing the specimens were carbon-debinded (81.9 h, maximum temperature 500°C) and sintered (time 48.9 h and maximum temperature 1450°C).
The specimens were divided into four groups: surface treated vertical group, surface treated horizontal group, vertical control group and horizontal control group. Surface treated groups were airborne-particle abraded with 50-µm aluminum oxide with 200 kPa pressure.
Specimens were 3-point flexural tested according to ISO 10477. Optical microscopy and scanning electron microscopy (SEM) were used to evaluate fractography. The results were statistically analyzed with ANOVA.
Results: Summary of results are shown in the Table below. Airborne-particle abrasion increased the flexural strength of vertically printed specimens by 34% and horizontal by 19%, which was statistically significant (p<0.05, ANOVA). Printing alignment also had a significant effect (p<0.05) on mechanical properties.
Optical microscopy and SEM revealed that the material is randomly delaminated between the printing layers which also caused the lower flexural strength of the vertically printed specimens. SEM revealed the effect of surface treatment on surface roughness.
Conclusions: Airborne-particle abrasion increased the strength and surface roughness of Zirconia specimens.