State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
Dept. of Prosthodontics, Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2024 Jun 1;42(3):353-358. doi: 10.7518/hxkq.2024.2023372.
This work aimed to evaluate the effect of artificial aging on the translucency and color difference (ΔE) of ultra-translucent zirconia and provide a reference for clinical application.
The discs of ultra-translucent zirconia from six brands (Wieland, 3M ESPE, Amann Girrbach, Kuraray Noritake, Upcera, and Besmile) were cut and sintered according to each manufacturer's product instructions; the experimental groups were named ZNT, LVP, AG, KAT, UPC, and BSM, respectively. IPS e.max Press was used as the control group (PLT). The specimens (=6) were prepared with a diameter of 14 mm and a thickness of 1 mm. The specimens were subjected to artificial aging treatment according to the following conditions: in an autoclave at 134 ℃ at 0.2 MPa for 4, 8, and 12 h. According to the CIE1976Lab system, the CIE L*, a*, and b* values of the specimens before and after aging were measured by a co-lorimeter. The translucency parameter (TP) and ΔE were calculated.
The mean TP values of each group before aging inorder were PLT>KAT>AG>ZNT>BSM>UPC>LVP. We found no significant difference in translucency in all experimental groups after aging for 4 and 8 h compared with those before aging. After 12 h of aging, the TP values of the KAT and ZNT groups were not significantly different from those before aging, but the TP values of the AG, BSM, LVP, and UPC groups were significantly lower than those before aging (<0.05). The TP value of the control group was significantly higher than that of the other experimental groups at different stages (<0.05). ΔE=3.3 was considered the visible color difference, and ΔE was less than 3.3 in all groups after 4 h of aging. After aging for 8 h, ΔE of the UPC group was slightly higher than 3.3. ΔE of the BSM and UPC groups was greater than 3.3 after 12 h of aging.
The TP and ΔE of different brands of ultra-translucent zirconia may change after various aging times. The translucency of some zirconia showed a decreasing trend and the color difference showed an increasing trend with the aging time.
本研究旨在评估人工老化对超透氧化锆的透光率和色差（ΔE）的影响，为临床应用提供参考。
将来自六个品牌（威兰德、3M ESPE、阿曼吉尔巴赫、可乐丽诺特克、优瓷、贝思摩尔）的超透氧化锆片切割并按各厂家产品说明烧结，实验组分别命名为 ZNT、LVP、AG、KAT、UPC 和 BSM，IPS e.max Press 为对照组（PLT）。制备直径为 14mm、厚度为 1mm 的试件（n=6）。试件按以下条件进行人工老化处理：在 134℃、0.2MPa 的高压蒸汽灭菌器中分别老化 4、8、12h。采用分光测色仪，根据 CIE1976Lab 系统，测量老化前后试件的 CIE L*、a*、b*值，计算透光率参数（TP）和 ΔE。
老化前各组的平均 TP 值依次为 PLT>KAT>AG>ZNT>BSM>UPC>LVP。老化 4、8h 后，各实验组的透光率与老化前相比均无显著差异。老化 12h 后，KAT 和 ZNT 组的 TP 值与老化前无显著差异，而 AG、BSM、LVP 和 UPC 组的 TP 值则显著低于老化前（<0.05）。不同阶段，对照组的 TP 值均显著高于其他实验组（<0.05）。ΔE=3.3 被认为是可见色差，老化 4h 后，所有组的 ΔE 均小于 3.3。老化 8h 后，UPC 组的 ΔE 略高于 3.3。老化 12h 后，BSM 和 UPC 组的 ΔE 大于 3.3。
不同品牌的超透氧化锆经不同时间的老化后，TP 和 ΔE 可能会发生变化。一些氧化锆的透光率呈下降趋势，色差呈上升趋势，且随老化时间的延长而增加。
