Int J Prosthodont. 2021 November/December;34(6):775–783. doi: 10.11607/ijp.7428. Epub 2021 Feb 12.
To investigate the impact of high-speed sintering on the accuracy (trueness and reproducibility) and fit of 4Y-TZP full-coverage single-unit fixed dental prostheses (FDPs) and three-unit FDPs.
Single-unit FDPs, conventional three-unit FDPs, and cantilever three-unit FDPs (N = 108; n = 12 per subgroup) were fabricated from: (1) high-speed sintered (1,580°C, about 20 minutes) multi-layer 4Y-TZP (Zolid RS, Amann Girrbach; ZMLH group), as well as two conventionally sintered (1,450°C, about 10 hours) materials: (2) multi-layer 4Y-TZP (Zolid Gen-X, Amann Girrbach; ZMLC group) and (3) monochrome 4Y-TZP (Ceramill Zolid HT+ PS, Amann Girrbach; ZMOC group). All specimens were scanned. Trueness, reproducibility, and fit were measured with 3D analysis software. For data analysis, Kolmogorov-Smirnov, Kruskal-Wallis, and Mann-Whitney U tests were performed (α = .05).
Three-unit FDPs made from ZMLH presented a deterioration of accuracy in comparison to ZMLC (P ≤ .001 to .008). The influence of highspeed sintering on marginal and general fit was not clinically relevant (P = .154 to .877).
High-speed sintering influenced the accuracy of 4Y-TZP full-coverage single-unit and three-unit FDPs. However, no clinically relevant impact on fit was observed.
研究高速烧结对 4Y-TZP 全覆盖单单位固定义齿（FDP）和三单位 FDP 的准确性（准确度和再现性）和适配性的影响。
从以下材料中制作单单位 FDP、传统三单位 FDP 和悬臂三单位 FDP：（1）高速烧结（1580°C，约 20 分钟）多层 4Y-TZP（Zolid RS，阿曼·格力巴赫；ZMLH 组），以及两种传统烧结（1450°C，约 10 小时）材料：（2）多层 4Y-TZP（Zolid Gen-X，阿曼·格力巴赫；ZMLC 组）和（3）单色 4Y-TZP（Ceramill Zolid HT+ PS，阿曼·格力巴赫；ZMOC 组）。所有样本均进行扫描。使用 3D 分析软件测量准确度、再现性和适配性。数据分析采用 Kolmogorov-Smirnov、Kruskal-Wallis 和 Mann-Whitney U 检验（α=0.05）。
与 ZMLC 相比，ZMLH 制成的三单位 FDP 的准确性降低（P≤0.001 至 0.008）。高速烧结对边缘和总体适配性的影响无临床意义（P=0.154 至 0.877）。
高速烧结影响 4Y-TZP 全覆盖单单位和三单位 FDP 的准确性。然而，未观察到对适配性的临床相关影响。
