Department of Prosthodontics, Karadeniz Technical University, Trabzon, Turkey.
J Esthet Restor Dent. 2020 Jan;32(1):26-33. doi: 10.1111/jerd.12533. Epub 2019 Oct 9.
The aim was to evaluate the effects of different types of monolithic zirconia (MZ) and fabrication techniques on the optical properties of newly generated zirconia-based materials after aging.
Sixty specimens (n = 10) were prepared. For the groups layering-veneering (LV), overpressing (OP), porcelain fused to zirconia (PFZ), and cutback (CB), 3Y-TZP, IPS e.max ZirCAD was prepared as the core material (0.5 ± 0.01 mm). For full-contour (FC) technique, 3Y-TZP was used for MZ-LT (low translucency) and 4Y-TZP was used for MZ-MT (medium translucency). L*, a*, b*, chroma (C), and relative translucency (RTP) were measured before (L *, a *, b *, C , RTP ) and after (L *, a *, b *, C , RTP ) UV aging. Statistical analyses were performed by one-way ANOVA with Tukey's test and paired sample t tests (P = .05).
Fabrication techniques significantly affected the L*, a*, b*, C, RTP, and ΔE values (P ˂ .01). The highest L * value was found in MZ-LT; followed, in order, by OP, PFZ, LV, CB, and MZ-MT. The highest b * and C values were found in OP, while MZ-MT had the lowest values (P ˂ .05). FC had the highest RTP values for MZ-MT (13 ± 0.9 RTP 11.2 ± 0.9 RTP ), and the lowest RTP values were found for MZ-LT (8.5 ± 0.9 RTP 8.3 ± 1.2 RTP ) (P ˂ .01). Aging caused significant differences in the L*, a*, b*, C, and RTP values (P < .05). The color changes were between 0.9 and 2.1 ΔE .
The fabrication technique significantly affected the optical properties. UV aging caused zirconia-based restorations to become darker and more yellow, red, saturated, and opaque.
Fabrication techniques with different zirconia structures affected the optical properties of the restoration, even when the same shades were chosen. If more translucent restorations are needed, choosing 4-YTZP with the FC technique is better than veneering with 3-YTZP. Choosing 3-YTZP with the FC technique produces more esthetic results if brighter and more opaque restorations are needed.
评估不同类型的整体氧化锆（MZ）和制造技术对老化后新型氧化锆基材料光学性能的影响。
制备 60 个试件（n=10）。对于分层贴面（LV）、超压（OP）、瓷熔附氧化锆（PFZ）和削减（CB）组，3Y-TZP、IPS e.max ZirCAD 被制备为核心材料（0.5±0.01mm）。对于全轮廓（FC）技术，MZ-LT（低透光率）使用 3Y-TZP，MZ-MT（中透光率）使用 4Y-TZP。在紫外线老化前后测量 L*、a*、b*、彩度（C）和相对透光率（RTP）（L*、a*、b*、C、RTP）。采用单因素方差分析和配对样本 t 检验进行统计学分析（P=0.05）。
制造技术显著影响 L*、a*、b*、C、RTP 和ΔE 值（P<0.01）。最高的 L值出现在 MZ-LT 中；其次是 OP、PFZ、LV、CB 和 MZ-MT。OP 中 b和 C 值最高，而 MZ-MT 值最低（P<0.05）。FC 中 MZ-MT 的 RTP 值最高（13±0.9 RTP，11.2±0.9 RTP），而 MZ-LT 的 RTP 值最低（8.5±0.9 RTP，8.3±1.2 RTP）（P<0.01）。老化导致 L*、a*、b*、C 和 RTP 值显著差异（P<0.05）。颜色变化在 0.9 到 2.1ΔE 之间。
制造技术显著影响光学性能。紫外线老化使氧化锆基修复体变暗，呈现更黄、更红、更饱和、更不透明。
不同氧化锆结构的制造技术影响修复体的光学性能，即使选择相同的色调也是如此。如果需要更半透明的修复体，选择 FC 技术的 4-YTZP 比 3-YTZP 贴面更好。如果需要更亮、更不透明的修复体，选择 FC 技术的 3-YTZP 会产生更好的美学效果。
