Hydrothermal ageing may increase surface roughness but not affect translucency in various zirconia ceramics suggests a recent study published in the European Journal of Dentistry. This study investigated the effect of hydrothermal aging on surface roughness and translucency of various translucent zirconia materials.
Four types of zirconia were tested. Group 1 was translucent zirconia with no cubic structure. Group 2, 3, and 4 included cubic-containing zirconia with different amounts of cubic structures (less than 30%, 30–50%, and more than 50%, respectively). Each group contained 15 disk-shape specimens with dimensions of 15 mm in diameter and 1 mm in thickness. As-sintered surface roughness, translucency parameter, and contrast ratio were evaluated in the two different sessions, before and after aging.


Two-way repeated measures ANOVA with Bonferroni test was used to analyze statistically significant difference in those tested parameters. Phase structure before and after aging was analyzed by X-ray diffraction analysis (XRD).
Results:
Groups 1 and 2 showed significant increased surface roughness after aging while groups 3 and 4 showed no alteration of surface.
There was no effect of aging on translucency in all groups.
After aging, group 1 and 2 presented monoclinic structure (16.63 and 5.01%, respectively).
Hydrothermal aging caused phase transformation and increasing surface roughness in group 1 and 2 but did not affect translucency in all groups.
Reference:
Kengtanyakich Santiphab, European Journal of Dentistry. 2022; DOI: 10.1055/s-0042-1755630
Keywords:
Hydrothermal, ageing, increase, surface, roughness, affect, translucency, zirconia, ceramics, European Journal of Dentistry