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首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Preparation of low shrinkage stress dental composite with synthesized dimethacrylate oligomers
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Preparation of low shrinkage stress dental composite with synthesized dimethacrylate oligomers

机译：用合成的二甲基丙烯酸酯低聚物制备低收缩应力牙科复合物

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摘要

Two dimethacrylate oligomers named polypropylenglycol bis(2-hydroxy-3-methoxypropyl) dimethacrylates (380PPMA and 640PPMA) with different molecular weight were synthesized through ring opening addition reaction between epoxy terminated oligomers PPDE and methacrylic acid, and their structures were confirmed by FT-IR and H-1-NMR spectra. The PPMAs were used to replace TEGDMA partially in Bis-GMA/TEGDMA (50/50, wt./wt.) with the aim to reducing volumetric shrinkage and shrinkage stress of dental resin composites. Dental resin composite without PPMAs was used as control. Double bond conversion (DC), volumetric shrinkage (VS), shrinkage stress, water sorption (WS) and solubility (SL), flexural strength (FS) and modulus (FM) of experimental dental resin composites were investigated. Dynamic mechanical analysis (DMA) was used to evaluate the glass transition temperature (Tg), heterogeneity, and crosslink density (upsilon). The results showed that dental resin composites contained 640PPMA had slower polymerization rate. Only dental resin composites with 20 wt% of 640PPMA in resin matrix had lower VS than control group (p 0.05), while after water immersion, FM of dental resin composites with PPMAs became lower than control (p < 0.05). Higher WS and SL were observed in composites with 640PPMA (p < 0.05). Incorporation of PPMAs into dental resin composites could decrease Tg and crosslink density (p < 0.05), but more homogeneous materials could be obtained (p < 0.05). Therefore, PPMAs could be used to reduce volumetric shrinkage and shrinkage stress of dental resin composites, but further studies concerned biocompatibility and service life should be taken because of the higher WS and SL.
机译：通过环氧封端的低聚物PPDE和甲基丙烯酸之间的开环加入反应合成具有不同分子量的聚丙烯酰基二苯甲酯（2-羟基-3-甲氧基丙基）二甲基丙烯酸酯（2-羟基-3-甲氧基丙基）二甲基丙烯酸酯（2-羟基-3-甲氧基丙基）二甲基丙烯酸酯（380ppmma和640ppma），并通过FT-IR确认它们的结构和H-1-NMR光谱。 PPMA用于部分地用BIS-GMA / TEGDMA（50/50，WT./WT）部分代替TEGDMA，其目的是降低牙科树脂复合材料的体积收缩和收缩应力。没有PPMA的牙科树脂复合物用作对照。研究了双键转化（DC），体积收缩（VS），收缩应力，水吸附（WS）和溶解度（S1），实验牙科树脂复合材料的抗弯曲强度（FS）和模量（FM）。动态机械分析（DMA）用于评估玻璃化转变温度（Tg），异质性和交联密度（upslon）。结果表明，牙科树脂复合材料640ppma具有较慢的聚合速率。只有20wt％640ppmma在树脂基质中只有比对照组更低的牙齿树脂复合材料（p 0.05），而水浸渍后，具有PPMA的牙科树脂复合材料的FM比对照（P <0.05）。在具有640ppma的复合材料中观察到更高的Ws和SL（P <0.05）。 PPMAS掺入牙科树脂复合材料可以降低Tg和交联密度（P <0.05），但可以获得更均匀的材料（P <0.05）。因此，PPMA可用于减少牙科树脂复合材料的体积收缩和收缩应力，但由于WS和SL更高，应采取进一步的生物相容性和使用寿命。

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