Biomaterials Engineering Group, Bristol Dental School, University of Bristol, Lower Maudlin Street, Bristol BS1 2LY, UK.
Child Dental Health, Bristol Dental School, University of Bristol, Lower Maudlin Street, Bristol BS1 2LY, UK.
Dent Mater. 2020 Dec;36(12):1595-1607. doi: 10.1016/j.dental.2020.09.016. Epub 2020 Nov 10.
To determine the mechanical and surface characteristics of two novel biomimetic interpenetrating phase alumina-polycarbonate (AlO-PC) composite materials, comprising aligned honeycomb-like porous ceramic preforms infiltrated with polycarbonate polymer.
Two composite materials were produced and characterised. Each comprised a porous structure with a ceramic-rich (polymer-poor) top layer, graduated through to a more porous ceramic-poor (polymer-rich) bottom layer. In addition, pure polycarbonate and dense alumina specimens were subjected to the same characterisation namely: density, compression, three-point bend, hardness, surface loss and surface roughness testing. Scanning electron microscopy and micro computerised tomography were employed for structural examination.
Three-dimensional aligned honeycomb-like ceramic structures were produced and full interpenetration of the polymer phase was observed using MicroCT. Depending on the ceramic volume in the initial aqueous ceramic suspension, the density of the final interpenetrating composites ranged from 2.64 to 3.01g/cm, compressive strength ranged from 192.43 to 274.91MPa, flexural strength from 105.54 to 148.47MPa, fracture toughness from 2.17 to 3.11MPa.m, hardness from 0.82 to 1.52GPa, surface loss from 0.71 to 1.40μm and surface roughness, following tooth brushing, from 0.70 to 0.99μm. Composite specimens showed characteristic properties part way between enamel and polycarbonate.
There was a correlation between the initial solid ceramic loading in the aqueous suspension, used to produce the porous ceramic scaffolds, and the subsequent characteristic properties of the composite materials. These novel composites show potential as aesthetic orthodontic bracket materials, as their properties fit part way between those of ceramic, enamel and polycarbonate.
确定两种新型仿生互穿氧化铝-聚碳酸酯（AlO-PC）复合材料的力学和表面特性，这两种复合材料由聚合物填充的取向蜂窝状多孔陶瓷预制件组成。
制备并表征了两种复合材料。每个复合材料都具有一种多孔结构，其中包括一个陶瓷含量较高（聚合物含量较低）的顶层，逐渐过渡到陶瓷含量较低（聚合物含量较高）的多孔底层。此外，还对纯聚碳酸酯和致密氧化铝试样进行了相同的特性测试，包括密度、压缩、三点弯曲、硬度、表面损失和表面粗糙度测试。使用扫描电子显微镜和微计算机断层扫描进行结构检查。
生成了三维取向蜂窝状陶瓷结构，并使用 MicroCT 观察到聚合物相的完全互穿。根据初始水基陶瓷悬浮液中陶瓷的体积，最终互穿复合材料的密度范围为 2.64 至 3.01g/cm，压缩强度范围为 192.43 至 274.91MPa，弯曲强度范围为 105.54 至 148.47MPa，断裂韧性范围为 2.17 至 3.11MPa.m，硬度范围为 0.82 至 1.52GPa，表面损失范围为 0.71 至 1.40μm，以及刷牙后的表面粗糙度范围为 0.70 至 0.99μm。复合材料表现出介于釉质和聚碳酸酯之间的特征性能。
用于生产多孔陶瓷支架的水基悬浮液中初始固体陶瓷负载与复合材料的后续特性之间存在相关性。这些新型复合材料作为美学正畸托槽材料具有潜力，因为它们的性能介于陶瓷、釉质和聚碳酸酯之间。
