Chang-yuan Zhang, DDS, PhD, associate professor, Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Laboratory of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China.
Check Agingu, Master's student, Fujian Key Laboratory of Oral Diseases & Fujian Provincial Engineering Research Center of Oral Biomaterial & Stomatological Key Laboratory of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China.
Oper Dent. 2022 Jan 1;47(1):76-86. doi: 10.2341/20-270-L.
This study aimed to investigate the effects of hydrothermal treatment on four types of monolithic, translucent, yttria-stabilized, tetragonal zirconia polycrystals (Y-TZPs).
Two commercially available Y-TZP brands-SuperfectZir High Translucency (Aidite Technology Co, China) and Katana HT (Kuraray Noritake Dental, Japan) were assessed. For each brand of Y-TZP, materials of four coloring types, including noncolored (NC), colored by staining (CS), precolored (PC), and multilayered (ML) specimens were investigated after hydrothermal aging in an autoclave at 134°C/0.2 MPa for 0 (control group), 5, 10, and 20 hours. The tetragonal-to-monoclinic phase transformation, surface roughness, flexural strength, and structural reliability (Weibull analysis) were measured and statistically analyzed (α=0.05). The subsurface microstructure was analyzed with scanning electron microscopy.
The group ML exhibited the lowest flexural strength and Weibull characteristic strength among the four coloring types (p<0.05). Slight increases in the monoclinic phase volume, flexural strength, and Weibull characteristic strength were observed after hydrothermal aging (pall<0.05). Regardless of coloring type, no significant effects of aging on the Weibull modulus or surface roughness were found for the tested materials. Compared with the Katana HT cross-sections, the SuperfectZir High Translucency cross-sections exhibited a similar but thicker transformation zone.
The coloring procedure and material type were found to affect the mechanical properties and aging resistance of translucent monolithic Y-TZP ceramics. Regardless of the aging time, the surface roughness of the tested Y-TZP ceramics remained unchanged.
本研究旨在探讨水热处理对四种整体式、半透明、氧化钇稳定的四方氧化锆多晶陶瓷（Y-TZP）的影响。
评估了两种市售 Y-TZP 品牌——SuperfectZir High Translucency（Aidite Technology Co，中国）和 Katana HT（Kuraray Noritake Dental，日本）。对于每个 Y-TZP 品牌，研究了四种着色类型的材料，包括无着色（NC）、染色着色（CS）、预着色（PC）和多层（ML）试件，在 134°C/0.2 MPa 的高压釜中进行水热老化 0（对照组）、5、10 和 20 小时。测量了四方相到单斜相的相变、表面粗糙度、弯曲强度和结构可靠性（威布尔分析），并进行了统计分析（α=0.05）。使用扫描电子显微镜分析了亚表面微观结构。
在四种着色类型中，ML 组的弯曲强度和威布尔特征强度最低（p<0.05）。水热老化后，单斜相体积、弯曲强度和威布尔特征强度略有增加（p<0.05）。无论着色类型如何，老化对测试材料的威布尔模数或表面粗糙度均无显著影响。与 Katana HT 切片相比，SuperfectZir High Translucency 切片显示出相似但更厚的相变区。
着色工艺和材料类型会影响半透明整体 Y-TZP 陶瓷的机械性能和抗老化能力。无论老化时间如何，测试的 Y-TZP 陶瓷的表面粗糙度保持不变。
