Korean J Dent Mater.  2023 Sep;50(3):121-134. 10.14815/kjdm.2023.50.3.121.

Effect of coloring treatment of translucent zirconia on the masking ability of metal abutment

• Lee MJ
• Park MG

• KMID: 2546956
• DOI: http://doi.org/10.14815/kjdm.2023.50.3.121

Abstract

Translucent monolithic zirconia is widely used because it has continuously enhanced color and translucency. However, when translucent monolithic zirconia are used for esthetic zone like anterior, it has problem to be exposed to color of titanium abutment. The purpose of this study was to evaluate the effect of coloring and cementing of translucent zirconia on the color masking of titanium abutments. The CIE L^{*, a*, and b* values were measured using a spectrophotometer in three subgroups after coloring with A2 colorant and white opaque colorant, and the color difference and translucency of each group were analyzed. In the A2 colorant application group, the color difference (ΔE* ) between zirconia and zirconia on titanium abutments was not clinically acceptable (ΔE* > 3.3). In the white opaque group and the white opaque plus A2 colorant group, the color difference (ΔE* ) between zirconia and zirconia on titanium abutments was clinically acceptable (1<ΔE* <3.3). The translucency of zirconia was significantly affected by the coloring treatment (P<.001). The Pearson correlation between color difference and translucency parameters was high (r=0.982, R2 =0.965). The white coloring treatment to translucent zirconia affected masking of titanium abutment. The combination of A2 colorant and white opaque colorant increased the color masking effect of titanium abutments and achieved a shade similar to natural teeth. Resin cement adhesion to translucent zirconia did not affect the color masking of titanium zirconia. As the zirconia translucency increases, it had less of an effect on the titanium abutment.}

Keyword

Translucent zirconia; Coloring treatment; Masking ability; Metal abutment