Department of Prosthetic Dentistry, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany.
Periodontics and Cardiology, Clinic for Preventive Dentistry, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
Dent Mater. 2020 Jul;36(7):838-845. doi: 10.1016/j.dental.2020.03.027. Epub 2020 May 4.
This investigation tested pre-shaded 3Y-TZP materials on optical, mechanical and structural properties and calculated correlations between these properties.
Seven A2-shaded 3Y-TZP zirconia materials were investigated on translucency (T) via UV-vis-spectrophotometer, fracture load of 3-unit FDPs (FL), biaxial flexural strength (FS), Chevron-Notch Beam (CNB), fracture toughness (K) and Martens parameter (hardness: HM and indentation modulus: E). FL, FS and K were measured in a universal testing machine. The grain size was evaluated by scanning electron microscopy (SEM). Data was analyzed using one-way ANOVA followed by post hoc Scheffé, Kruskal-Wallis-, Mann-Whitney-U- and Pearson-test (p<0.05).
For translucency, negative correlations were found with results of facture load (R=-0.444, p<0.001) and K (R=-0.503, p<0.001). While a positive correlation was found between translucency and flexural strength (R=0.238, p=0.019), between fracture load and E (R=0.227, p<0.029), between fracture load and K (R=0.362, p<0.001) as well as between fracture load and the grain size (R=0.598, p=0.007). While the grain size positively correlated with E (R=0.534, p=0.017) as well as E with HM (R=0.720, p<0.001).
Despite of being based on the same raw material, tested zirconia materials significantly differed regarding optical, mechanical (except biaxial flexural strength and Martens hardness) and structural properties. Materials with highest optical properties were those with lowest mechanical properties (CER, COP).
本研究测试了预遮色 3Y-TZP 材料的光学、机械和结构性能，并计算了这些性能之间的相关性。
对 7 种 A2 遮色 3Y-TZP 氧化锆材料的透光率（T）进行了紫外线-可见分光光度计、3 单位 FDP 的断裂载荷（FL）、双轴弯曲强度（FS）、切尼尔缺口梁（CNB）、断裂韧性（K）和马氏体参数（硬度：HM 和压痕模量：E）的测试。FL、FS 和 K 均在万能试验机上进行测试。使用扫描电子显微镜（SEM）评估晶粒尺寸。使用单向方差分析（ANOVA）以及事后 Scheffé、Kruskal-Wallis、Mann-Whitney-U 和 Pearson 检验（p<0.05）对数据进行分析。
对于透光率，与断裂载荷（R=-0.444，p<0.001）和 K（R=-0.503，p<0.001）呈负相关。而透光率与弯曲强度（R=0.238，p=0.019）、断裂载荷与 E（R=0.227，p<0.029）、断裂载荷与 K（R=0.362，p<0.001）以及断裂载荷与晶粒尺寸（R=0.598，p=0.007）呈正相关。而晶粒尺寸与 E（R=0.534，p=0.017）以及 E 与 HM（R=0.720，p<0.001）呈正相关。
尽管基于相同的原材料，但测试的氧化锆材料在光学、机械（双轴弯曲强度和马氏体硬度除外）和结构性能方面存在显著差异。光学性能最高的材料其机械性能最低（CER、COP）。
