Kou Wen, Garbrielsson Klas, Borhani Adrian, Carlborg Markus, Molin Thorén Margareta
Department of Odontology, Umeå University, Umeå, Sweden.
Department of Applied Physics and Electronics, Umeå University, Umeå, Sweden.
Biomater Investig Dent. 2019 Nov 7;6(1):54-60. doi: 10.1080/26415275.2019.1684201. eCollection 2019.
Zirconia is known for its high strength but lacking translucency. Recently, a new type of high translucent zirconia, 5 mol% yttria partially stabilized zirconia (5Y-PSZ), with a larger fraction of cubic zirconia phase has become commercially available. However, the resistance to aging of these commercially available zirconia materials is not yet fully established. The aim of the present study was to analyze the effects of artificial aging on surface roughness, transparency, phase transformation and biaxial flexural strength of two 5Y-PSZ products, DD cubeX and Prettau Anterior. The artificial aging was performed in an autoclave under 2 bars of pressure at 134 °C for 10 hours, which is estimated to correspond to 30-40 years . Artificial aging for 10 hours had no significant effect on surface roughness, transparency, or phase transformation for either of the tested materials. DD cubeX had higher mean flexural strength than Prettau Anterior both before and after artificial aging for 10 hours ( < .05). DD cubeX showed, however, a significant reduction in flexural strength after artificial aging ( < .05), whereas Prettau Anterior showed a slight increase in flexural strength after artificial aging but not at a significant level. Within the limitation of the present study, both DD cubeX and Prettau Anterior seems to be relatively resistant to aging. However, a wider range of measured flexural strength indicated that Prettau Anterior probably is a less stable material than DD cubeX, which also means that the flexural strength of DD cubeX could be more predictable.
氧化锆以其高强度但缺乏透明度而闻名。最近，一种新型的高透明度氧化锆，即5摩尔%氧化钇部分稳定氧化锆（5Y-PSZ），由于立方氧化锆相的比例更大，已开始商业化供应。然而，这些市售氧化锆材料的抗老化性能尚未完全确定。本研究的目的是分析人工老化对两种5Y-PSZ产品DD cubeX和Prettau Anterior的表面粗糙度、透明度、相变和双轴弯曲强度的影响。人工老化是在高压釜中于134°C、2巴压力下进行10小时，据估计这相当于30至40年。10小时的人工老化对两种测试材料的表面粗糙度、透明度或相变均无显著影响。在10小时人工老化前后，DD cubeX的平均弯曲强度均高于Prettau Anterior（P<0.05）。然而，DD cubeX在人工老化后弯曲强度显著降低（P<0.05），而Prettau Anterior在人工老化后弯曲强度略有增加，但未达到显著水平。在本研究的限制范围内，DD cubeX和Prettau Anterior似乎都相对抗老化。然而，更广泛的弯曲强度测量范围表明，Prettau Anterior可能比DD cubeX更不稳定，这也意味着DD cubeX的弯曲强度可能更具可预测性。
