超支化聚酯对牙科树脂的改性及力学性能的评价  

Modification of the composite resin with the hyperbranched polyester and evaluation of the mechanical properties of the modified composite resin

作　　者：罗有成[1] 孙素[1] 肖玉鸿[1] 

机构地区：[1]昆明医科大学成都军区昆明总医院临床学院口腔科,昆明650032

出　　处：《中华口腔医学杂志》2016年第4期248-253,共6页Chinese Journal of Stomatology

基　　金：国家自然科学基金（81460107）

摘　　要：目的 探讨两种超支化聚酯（hyperbranched polyester,HBP）改性后牙科常用树脂力学性能的变化,评价该类超支化聚酯在口腔修复材料中的应用前景.方法 将HBP2-X型和HBP2-Y型超支化聚酯,按40％质量百分比分别添加至牙科常用树脂基质[双酚A双甲基丙烯酸缩水甘油酯（bisphenol-A diglycidyl methacrylate,Bis-GMA）/双甲基丙烯酸二缩三乙二醇酯（triethylene glycol dimethacrylate,TEGDMA）]中,作为X组和Y组,以未添加超支化聚酯的树脂基质作为对照组.比较3组树脂的体积收缩率、维氏硬度、吸水值、溶解值,以及添加0％、30％、50％、70％无机填料后3组复合树脂的挠曲强度、压缩强度和径向拉伸强度（每项实验每组样本量均为8）.结果 X、Y组树脂体积收缩率分别为（6.32±0.49）％和（6.31±0.68）％,较对照组[（8.14±0.53）％]显著降低（P＜0.05）;X、Y组维氏硬度分别为（198±5）和（177±4） MPa,较对照组[（214±6） MPa]显著降低（P＜0.05）;X、Y组吸水值和溶解值均较对照组显著升高（P＜0.05）.对含70％无机填料的复合树脂而言,3组挠曲强度差异无统计学意义（P＞0.05）;X组与对照组压缩强度[分别为（244±13）和（234±17） MPa]均显著大于Y组[（204±24） MPa]（P＜0.05）;X组径向拉伸强度[（41.1±3.0）MPa]显著大于Y组和对照组[分别为（36.4±2.1）和（34.4±2.9） MPa]（P＜0.05）.结论 经超支化聚酯改性后树脂基质力学性能受到一定影响,但收缩性能测试结果较理想,可进一步研究.Objective To study the effect of hyperbranched polyester（HBP） on mechanical properties of the conventional resin matrix.Methods Two hyperbranched monomers（HBP2-X and HBP2,-Y）were synthesized and incorporated at 40%（by mnass） into a 2：1（by mass） bisphenol-A diglycidyl methacrylate （Bis-GMA）：triethylene glycol dimethacrylate（TEGDMA） resin.Bis-GMA/TEGDMA without the incorporation of hyperbranched polyester was used as control（n=8 per group）.The mechanical properties of the modified neat resin,including polymerization volumetric shrinkage,Vickers hardness,water absorption and dissolution rate,as well as the flexural strength,compressive strength and diametral tensile strength of the composite resin with different content of filler（0%,30%,50%,70%） were measured.Mechanical properties of the composite resin were measured by universal testing machine.The results were analyzed by the ANOVA and LSD-t-test.Results The resin with HBP greatly decreased the polymerization shrinkage of the composite resin,and the value of group X was （6.32±0.49）%,and that of group Y was （6.31±0.68）%,whereas that of the control group was （8.14± 0.53）%.The value of volumetric shrinkage of the modified groups were significantly lower than that of the control group（P〈0.05）.By adding HBP,the hardness value of group X（[198± 5] MPa） and group Y（[177± 4] MPa） were significantly lower than that of the control group （[214±6] MPa）（P〈0.05）.The HBP significantly influenced the water sorption and solubility of the neat resin （P〈0.05）.For the composite materials,with 70% inorganic filler,there were no significant difference in the value of flexural strength among the groups（P〉0.05）.There was no significant difference in the value of compressive strength,between group X（[244± 13] MPa） and the standard group（[234± 17] MPa）（P〉0.05）.However,they were significantly higher than that in group Y（[204 ± 24] MPa）（P〈0.05）.For the value of diametral tensil

关 键 词：复合树脂类 力学性能 超支化聚酯 

分 类 号：R783.1[医药卫生—口腔医学]