具有梯度特性的齿科修复复合材料制备及表征

Fabrication and Characterization of Dental Restorative Composites with Gradient Properties

本工作的目的是研究原生牙齿的梯度力学性能,制备聚合物渗透陶瓷网络(PICN)复合材料,模拟天然牙的力学行为。采用纳米压痕法测定了牙釉质和牙本质的弹性模量和维氏硬度。结果表明,原生牙齿的力学性能具有梯度特性。树脂填充部分烧结硅铝酸钠、氧化铝和氧化锆的力学性能有很大差异。通过逐步改变陶瓷组分,实现了力学性能的梯度变化。一种是纳米玻璃相硅铝酸钠/微米α氧化铝层合复合材料。陶瓷坯体的烧结温度为700℃,保温时间分别为2、4和6 h。对复合材料的抗弯强度、断裂韧性、弹性模量和硬度进行了测试,结果表明:硅铝酸钠/微米α氧化铝复合材料的弹性模量和硬度呈现梯度特性。另一种是3Y-TZP/微米α氧化铝层合复合材料。坯体烧结温度分别为1150和1200℃,保温时间为2h。其弹性模量和硬度均呈现梯度特性。SEM观察表明,过渡区形成了相互咬合的网络结构。与普通均质材料不同,本研究制备的复合材料具有各向异性。因此,复合材料的力学性能更接近于原生牙齿。

The aim of this work was to examine the gradient mechanical properties of natural tooth and to fabricate polymer-infiltrated-ceramic network(PICN) composites for simulating natural tooth and its mechanical behaviors.The elastic modulus and Vickers hardness of enamel and dentin were examined through nano indentation.Results show that natural tooth have gradient characteristics.There are great differences in the mechanical properties of resin infiltrated partially sintered sodium aluminum silicate,alumina and zirconia.The gradient change of mechanical properties is realized through gradually changing the ceramic component.One is nano glass phase sodium aluminum silicate-micron a alumina laminated composites.The sintering temperature of ceramic green body is 700℃.The holding time is 2,4 and 6 h.Flexural strength,fracture toughness,elastic modulus and hardness of the composite were tested,and results show that elastic modulus and hardness of the sodium aluminum silicate-alumina composites exhibit gradient characteristics.The other is 3 Y-TZP-micron a alumina laminated composites.The sintering temperature of green body is 1150 and 1200℃,with a holding time of 2 h.The results show that both elastic modulus and hardness exhibit gradient characteristics.SEM observation shows that an interlocking grid structure is formed in transition zone.Different from ordinary homogeneous materials,composites prepared in this study have anisotropy.And therefore,the mechanical properties of the composites are closer to the primary teeth.