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目的初步评价新型丙烯酸液晶树脂基质在口腔修复中的应用前景。方法以自制的丙烯酸液晶树脂基质单体[4-(3-丙烯酰氧基-2-羟基丙氧基)苯甲酸4’-(3-丙烯酰氧基-2-羟基丙氧基)苯甲酯,ALCRM]和传统树脂基质双酚A-双甲基丙烯酸缩水甘油酯(Bis-GMA)单体作为复合树脂基质的主单体,分别与双甲基丙烯酸二缩三乙二醇酯(TEGDMA)以质量比7∶3混合,然后加入光引发体系樟脑醌1 wt%/N,N-二甲胺基甲基丙烯酸乙酯2 wt%,光固化条件下引发聚合。应用傅里叶红外光谱(FTIR)测试技术检测单体聚合转化率,用光固化灯照射测定固化时间、固化深度,用膨胀计测定体积收缩率。结果 ALCRM型树脂聚合转化率为68.19%,Bis-GMA型树脂聚合转化率为45.86%。与Bis-GMA型树脂比较,ALCRM型树脂固化时间(3.18 min±0.20 min)相对较短,固化深度(3.62 mm±0.25 mm)较厚,体积收缩率(3.32%±0.28%)也较小,组间比较差异均有统计学意义(P<0.05)。结论 ALCRM可以与口腔常用稀释单体TEGDMA发生共聚,在常规固化条件下,固化时间短,固化深度高,聚合收缩率低,具有较理想的口腔材料的特征,值得进一步研究推广。
Objective To evaluate the application prospect of new acrylic liquid crystal resin matrix in oral repair. Methods The self-made acrylic liquid crystal resin matrix monomer [4- (3-acryloyloxy-2-hydroxypropoxy) benzoic acid 4 ’- (3-acryloyloxy-2-hydroxypropoxy) Ester, ALCRM] and the traditional resin matrix bisphenol A-bis-glycidyl methacrylate (Bis-GMA) as the main monomer of the composite resin matrix, respectively, with triethylene glycol dimethacrylate (TEGDMA ) In a mass ratio of 7: 3, and then adding the photoinitiator camphorquinone 1 wt% / N, N- dimethylaminoethyl methacrylate 2 wt% to initiate polymerization under light curing conditions. The polymerization conversion of monomer was measured by Fourier transform infrared spectroscopy (FTIR). The curing time and the depth of cure were measured with a light curing lamp. The volumetric shrinkage was measured with a dilatometer. Results The polymerization conversion of ALCRM resin was 68.19% and that of Bis-GMA resin was 45.86%. Compared with Bis-GMA type resin, ALCRM type resin has shorter curing time (3.18 min ± 0.20 min), thicker curing depth (3.62 mm ± 0.25 mm) and smaller volumetric shrinkage (3.32% ± 0.28% The differences between the two groups were statistically significant (P <0.05). CONCLUSION ALCRM can be copolymerized with TEGDMA, a commonly used diluent monomer in oral cavity. Under conventional curing conditions, the curing time is short, the curing depth is high and the rate of polymerization shrinkage is low. Therefore, ALCRM is worthy of further research and popularization.