Wong Yin Mun, Ireland Anthony J, Su Bo
Child Dental Health, Bristol Dental School, University of Bristol, 1 Trinity Walk, Avon Street, Bristol BS2 0PT, UK.
Biomaterials Engineering Group, University of Bristol, Dorothy Hodgkin Building, Whitson Street, Bristol BS1 3NY, UK.
Biomimetics (Basel). 2025 Apr 5;10(4):227. doi: 10.3390/biomimetics10040227.
To create an orthodontic bracket material combining the favourable properties of ceramic and polymer while minimising their limitations, graded porous ceramic scaffolds were created using unidirectional gelation-freeze casting, following which the pores were infiltrated with polymer. Two processing parameters were investigated: (1) sedimentation times of 0, 8, and 24 h, with ceramic solid loading of 20 vol.% and 2.5 wt.% gelatine concentration, and (2) ceramic solid loadings of 15, 20, and 25 vol.% with a fixed 2.5 wt.% gelatine concentration and an 8 h sedimentation time. The graded ceramic structures demonstrated porosity gradients ranging from 9.86 to 63.84 vol.%, except those with 25 vol.% ceramic solid loading at 8 h sedimentation. The AlO-UDMA/TEGDMA composites had compressive strengths of 60.25 to 120.92 MPa, modulus of elasticity of 19.84 to 35.29 GPa, and fracture toughness of 0.78 to 1.78 MPa·m. The values observed were between those of dense ceramic and pure polymer. Statistical analysis was conducted using Excel 2019 (Microsoft, Washington, DC, USA). Means, standard deviations, and 95% confidence intervals (CI) were calculated at a significance level of α = 0.05, alongside polynomial regression to evaluate relationships between variables. Composites with 20 vol.% ceramic solid loading at 8 h sedimentation displayed promising potential for further clinical validation.
为了制备一种结合陶瓷和聚合物的优良性能同时将其局限性降至最低的正畸托槽材料，采用单向无凝胶冷冻铸造法制备了梯度多孔陶瓷支架，随后用聚合物对孔隙进行渗透。研究了两个加工参数：（1）沉降时间为0、8和24小时，陶瓷固相含量为20 vol.%，明胶浓度为2.5 wt.%；（2）陶瓷固相含量为15、20和25 vol.%，明胶浓度固定为2.5 wt.%，沉降时间为8小时。除了在8小时沉降时间下陶瓷固相含量为25 vol.%的那些结构外，梯度陶瓷结构的孔隙率梯度范围为9.86至63.84 vol.%。AlO-UDMA/TEGDMA复合材料的抗压强度为60.25至120.92 MPa，弹性模量为19.84至35.29 GPa，断裂韧性为0.78至1.78 MPa·m。观察到的值介于致密陶瓷和纯聚合物之间。使用Excel 2019（美国华盛顿微软公司）进行统计分析。在α = 0.05的显著性水平下计算均值、标准差和95%置信区间（CI），同时进行多项式回归以评估变量之间的关系。在8小时沉降时间下陶瓷固相含量为20 vol.%的复合材料显示出进一步临床验证的良好潜力。
Zotero 插件
