Department of Oral Sciences, School of Dentistry, Dunedin 9001, New Zealand.
Dent Mater. 2013 Apr;29(4):419-26. doi: 10.1016/j.dental.2013.01.002. Epub 2013 Feb 12.
To determine and identify correlations between flexural strength, strain at failure, elastic modulus and hardness versus ceramic network densities of a range of novel polymer-infiltrated-ceramic-network (PICN) materials.
Four ceramic network densities ranging from 59% to 72% of theoretical density, resin infiltrated PICN as well as pure polymer and dense ceramic cross-sections were subjected to Vickers Indentations (HV 5) for hardness evaluation. The flexural strength and elastic modulus were measured using three-point-bending. The fracture response of PICNs was determined for cracks induced by Vickers-indentation. Optical and scanning electron microscopy (SEM) was employed to observe the indented areas.
Depending on the density of the porous ceramic the flexural strength of PICNs ranged from 131 to 160MPa, the hardness values ranged between 1.05 and 2.10GPa and the elastic modulus between 16.4 and 28.1GPa. SEM observations of the indentation induced cracks indicate that the polymer network causes greater crack deflection than the dense ceramic material. The results were compared with simple analytical expressions for property variation of two phase composite materials.
This study points out the correlation between ceramic network density, elastic modulus and hardness of PICNs. These materials are considered to more closely imitate natural tooth properties compared with existing dental restorative materials.
确定并识别一系列新型聚合物渗透陶瓷网络（PICN）材料的弯曲强度、失效应变、弹性模量和硬度与陶瓷网络密度之间的相关性。
对四种陶瓷网络密度（理论密度的 59%至 72%）、树脂渗透 PICN 以及纯聚合物和致密陶瓷进行维氏压痕（HV5）硬度评估。使用三点弯曲法测量弯曲强度和弹性模量。通过维氏压痕诱导裂纹来确定 PICN 的断裂响应。采用光学显微镜和扫描电子显微镜（SEM）观察压痕区域。
根据多孔陶瓷的密度，PICN 的弯曲强度范围为 131 至 160MPa，硬度值在 1.05 至 2.10GPa 之间，弹性模量在 16.4 至 28.1GPa 之间。压痕诱导裂纹的 SEM 观察表明，聚合物网络比致密陶瓷材料更能引起裂纹偏转。结果与两相复合材料性能变化的简单分析表达式进行了比较。
本研究指出了 PICN 的陶瓷网络密度、弹性模量和硬度之间的相关性。与现有牙科修复材料相比，这些材料被认为更能模拟天然牙齿的特性。
