改性纳米氧化铈对义齿树脂基托机械性能的影响

目的:研究经硬脂酸改性后的纳米CeO₂对义齿树脂基托机械性能的影响。方法:将改性纳米颗粒按照质量比分别为1%、2%、3%、4%和5%的添加量添加到义齿基托材料(PMMA)的单体中,制成不同浓度的纳米齿复合材料,制成标准试件。对每组试件冲击强度,弯曲强度等指标进行检测,并与未添加纳米颗粒组比较,将最终数据进行统计分析。结果:经硬脂酸改性后的纳米氧化铈能够提高树脂基托的机械性能,所测试指标都呈现先增大后减小的趋势。其中添加比例为3%时纳米复合材料的综合性能达到最佳状态,其冲击强度、弯曲强度和弯曲模量分别为(4.186±0.149) J/cm²、(88.865±2.345) MPa和(1.539±0.096) GPa(P<0.05)。结论:在义齿基托材料单体中加入不同浓度的纳米氧化铈颗粒可以提高传统义齿基托的冲击强度,弯曲强度等机械性能,从而可以获得品质优良的纳米义齿复合材料。

Effect of Modified Cerium Oxide Nanoparticles on Mechanical Properties of Denture Resin Base

Objective: To investigate the effect of nano-CeO₂ modified by stearic acid on mechanical properties of denture resin base. Methods: Modified nanoparticles were added in the monomer of denture base materials (PMMA) at the ratios of 0%, 1%, 2%, 3%, 4% and 5% (m:m). Standard specimens were prepared. Impact strength and bending strength were detected in each group. Results: The addition of modified nano-CeO² improved the mechanical properties of resin denture base. The best combination property was obtained at the ratio of 3%. The impact strength, flexural strength and flexural modulus were (4.186 ± 0.149) J/cm², (88.865 ± 2.345) MPa, and (1.539 ± 0.096 ) GPa, respectively (P<0.05). Conclusion: The addition of modified nano-CeO² can improve the mechanical properties of denture resin base.