Ayata Mustafa, Albayrak Haydar, Eraslan Ravza
Private Practice, Ortoperio Oral and Dental Health Polyclinic, Kocasinan, Kayseri, Türkiye.
Department of Prosthodontics, Faculty of Dentistry, Erciyes University, Melikgazi, Kayseri, Türkiye.
Odontology. 2025 Apr 28. doi: 10.1007/s10266-025-01110-8.
The purpose of this study was to examine the influence of fast sintering on the optical properties, fracture strength, and microstructure of monolithic zirconia (MZ) ceramics. After 20 disc-shaped and 4 square-shaped samples from the MZ block were machined in the CAM device, groups were created by the sintering procedure in accordance with the manufacturer's recommendations: Standard (Grup S; disc-shaped n = 10 square-shaped n = 2) and fast (Grup F; disc-shaped n = 10 square-shaped n = 2). Then, hydrothermal aging was applied to all samples. To calculate translucency, opalescence, and fluorescence values, the LabCh color data of the samples were defined using spectrophotometers. The disc samples were biaxially fracture tested, and the values were determined. The chemical content, grain size (GS), and phase composition of the square-shaped samples were analyzed, respectively. Since the grain size did not conform to the normal distribution, the Mann-Whitney U test was used for statistical analysis, and all other variables were analyzed by an independent sample t test (α = 0.05). The sintering procedure affected translucency, opalescence, fracture strength, and GS significantly (P < 0.05), but not fluorescence (P > 0.05). While both groups had similar crystal structures, there were some minor differences in chemical content. All samples had a higher fracture strength than the ISO 6872 standard recommends. The sintering procedure had no clinically significant effect on the optical properties of MZ. The fast sintering procedure of MZ can be recommended.
本研究的目的是考察快速烧结对整体式氧化锆（MZ）陶瓷光学性能、断裂强度和微观结构的影响。从MZ块体加工出20个圆盘形和4个方形样品后，根据制造商的建议通过烧结程序分组：标准组（S组；圆盘形n = 10，方形n = 2）和快速组（F组；圆盘形n = 10，方形n = 2）。然后，对所有样品进行水热老化处理。为计算半透明度、乳光和荧光值，使用分光光度计定义样品的LabCh颜色数据。对圆盘样品进行双轴断裂测试并确定其值。分别分析方形样品的化学成分、晶粒尺寸（GS）和相组成。由于晶粒尺寸不符合正态分布，采用曼-惠特尼U检验进行统计分析，其他所有变量通过独立样本t检验进行分析（α = 0.05）。烧结程序对半透明度、乳光、断裂强度和GS有显著影响（P < 0.05），但对荧光无影响（P > 0.05）。虽然两组具有相似的晶体结构，但化学成分存在一些细微差异。所有样品的断裂强度均高于ISO 6872标准的推荐值。烧结程序对MZ的光学性能无临床显著影响。可以推荐MZ的快速烧结程序。
