Kim Hee-Kyung, Kim Sung-Hun, Lee Jai-Bong, Han Jung-Suk, Yeo In-Sung, Ha Seung-Ryong
Comprehensive Treatment Center, Seoul National University Dental Hospital, Seoul, Republic of Korea.
Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
J Adv Prosthodont. 2016 Feb;8(1):37-42. doi: 10.4047/jap.2016.8.1.37. Epub 2016 Feb 23.
This study investigated the effect of amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics.
One-hundred sixty-five monolithic zirconia specimens (16.3 mm × 16.3 mm × 2.0 mm) were divided into 5 groups (Group I to V) according to the number of A2-coloring liquid applications. Each group was then divided into 11 subgroups by reducing the thickness up to 1.0 mm in 0.1-mm increments (Subgroup 0 to 10, n=3). Colors and spectral distributions were measured according to CIELAB on a reflection spectrophotometer. All measurements were performed on five different areas of each specimen. Color difference (ΔE(*) ab) and translucency parameter (TP) were calculated. Data were analyzed using one-way ANOVA and multiple comparison Scheffé test (α=.05).
There were significant differences in CIE L() between Subgroup 0 and other subgroups in all groups. CIE a() increased (0.52<R(2)<0.73), while CIE b(*) decreased (0.00<R(2)<0.74) in all groups with increasing thickness reduction. Perceptible color differences (ΔE(*) ab>3.7) were obtained between Subgroup 0 and other subgroups. TP values generally increased as the thickness reduction increased in all groups (R(2)>0.89, P<.001).
Increasing thickness reduction reduces lightness and increases a reddish, bluish appearance, and translucency of monolithic zirconia ceramics.
本研究调查了厚度减少量对牙科整体式氧化锆陶瓷颜色和半透明度的影响。
165个整体式氧化锆试样（16.3毫米×16.3毫米×2.0毫米）根据A2色染液施加次数分为5组（I组至V组）。然后每组通过以0.1毫米的增量将厚度减少至1.0毫米分为11个亚组（亚组0至10，n = 3）。在反射分光光度计上根据CIELAB测量颜色和光谱分布。所有测量在每个试样的五个不同区域进行。计算颜色差异（ΔE(*) ab）和半透明度参数（TP）。使用单因素方差分析和多重比较Scheffé检验（α = .05）分析数据。
在所有组中，亚组0与其他亚组之间在CIE L() 上存在显著差异。随着厚度减少增加，所有组中的CIE a() 增加（0.52 < R(2) < 0.73），而CIE b(*) 减少（0.00 < R(2) < 0.74）。在亚组0与其他亚组之间获得了可察觉的颜色差异（ΔE(*) ab > 3.7）。在所有组中，TP值通常随着厚度减少增加而增加（R(2) > 0.89，P < .001）。
增加厚度减少会降低明度，并增加整体式氧化锆陶瓷的微红、微蓝外观和半透明度。
