Mayinger Felicitas, Pfefferle Regina, Reichert Axel, Stawarczyk Bogna
Int J Prosthodont. 2021 Jan-Feb;34(1):47-53. doi: 10.11607/ijp.6775.
To investigate the impact of high-speed sintering and artificial aging on the fracture load of three-unit zirconia fixed dental prostheses (FDPs).
Three-unit FDPs manufactured from 3Y-TZP (Ceramill Zolid, Amann Girrbach) and 4Y-TZP (Ceramill Zolid HT+, Amann Girrbach; N = 128, n = 64/group) were sintered at 1,580°C (high-speed sintering) or at 1,450°C (control group; n = 32/subgroup). Specimens were bonded to steel abutment models using Multilink Automix (Ivoclar Vivadent), and fracture load was examined without (n = 16/subgroup) and with artificial aging (6,000 thermocycles [5°C/55°C] and 1,200,000 chewing cycles [50 N]; n = 16/subgroup). Univariate analysis of variance, unpaired t test, and Weibull modulus were computed (P < .05).
Sintering protocol (P = .944), artificial aging (P = .630), and zirconia material (P = .445) did not show an influence on the fracture load of three-unit FDPs. High-speed sintering led to superior Weibull modulus results for artificially aged 4Y-TZP specimens, while all other groups showed values in the same range.
The present study shows promising results for the novel high-speed sintering protocol, as it led to comparable fracture load and similar, or even superior, Weibull modulus results compared to the control group. The 4Y-TZP material presented fracture load results similar to the tried-and-tested 3Y-TZP. Artificial aging did not influence zirconia's resistance to fracture for either 3Y-TZP or 4Y-TZP.
研究高速烧结和人工老化对三单位氧化锆固定义齿（FDP）断裂载荷的影响。
用3Y-TZP（Ceramill Zolid，阿曼吉尔巴赫公司）和4Y-TZP（Ceramill Zolid HT+，阿曼吉尔巴赫公司；N = 128，每组n = 64）制作的三单位FDP在1580°C（高速烧结）或1450°C（对照组；每个亚组n = 32）下烧结。使用Multilink Automix（义获嘉伟瓦登特公司）将标本粘结到钢制基台模型上，在未进行人工老化（每个亚组n = 16）和进行人工老化（6000次热循环[5°C/55°C]和1200000次咀嚼循环[50 N]；每个亚组n = 16）的情况下检测断裂载荷。计算单因素方差分析、非配对t检验和威布尔模量（P < 0.05）。
烧结方案（P = 0.944）、人工老化（P = 0.630）和氧化锆材料（P = 0.445）对三单位FDP的断裂载荷均无影响。高速烧结使人工老化的4Y-TZP标本的威布尔模量结果更优，而所有其他组的数值在同一范围内。
本研究显示了新型高速烧结方案的良好结果，因为与对照组相比，它导致了相当的断裂载荷以及相似甚至更优的威布尔模量结果。4Y-TZP材料的断裂载荷结果与经过验证的3Y-TZP相似。人工老化对3Y-TZP或4Y-TZP的氧化锆抗断裂性均无影响。
