Objectives

Tetrahydrofurfuryl-methacrylate (THFM) and hydroxypropyl-methacrylate (HPM) were used to partially or fully replace HEMA in experimental RMGICs. The experimental materials were compared with home and commercial products in terms of degree of conversion, polymerization shrinkage and exotherm.

Methods

Two commercial RMGICs used were Fuji-Plus (FP, GC, Japan) and RelyX-Luting (RX, 3M-ESPE, USA). Two additional in-house liquids were prepared based on the commercial materials liquids. Eight experimental liquid compositions (F1, F2, F3 and F4 based on Fuji-Plus; R1, R2, R3 and R4 based on RelyX-Luting) were prepared replacing 100% HEMA with HPM in F1 and R1 or 70%/30% HPM/THFM in F2 and R2. 50% HEMA was replaced with THFM in F3 and R3 compared to 30% in F4 and R4. All liquids were mixed with the corresponding commercial powder. Degree of conversion was determined using Fourier-transform infrared spectroscopy (FT-IR). Polymerization shrinkage and exotherm were measured using the bonded-disk method.

Results

Compositions containing HPM (F1 and R1) showed lower degree of conversion compared to experimental compositions containing THFM, home and commercial materials (p < 0.0001). FP-commercial showed significantly higher polymerization shrinkage and exotherm compared to all other materials in both groups (p < 0.0001). FP-commercial showed higher degree of polymerization shrinkage and exotherm at 5 min compared to all materials due to the incorporation of an additional cross-linker (glycerol-dimethacrylate). In general, compositions containing THFM, presented polymerization shrinkage and degree of conversion values similar to their corresponding commercial products.

Significance

THFM monomer showed promising results and could be potentially useful in the development of new RMGICs with improved properties.

中文翻译：

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商业和实验用树脂改性的玻璃离聚物型胶结水泥（RMGIC）的聚合收缩动力学和转化率。

目标

甲基丙烯酸四氢糠基酯（THFM）和甲基丙烯酸羟丙酯（HPM）用于部分或完全替代实验RMGIC中的HEMA。在转化率，聚合收缩率和放热方面，将实验材料与家用和商用产品进行了比较。

方法

使用的两种商业RMGIC是Fuji-Plus（FP，GC，日本）和RelyX-Luting（RX，3M-ESPE，美国）。基于商业原料液体制备了另外两种内部液体。准备了八种实验液体组合物（基于Fuji-Plus的F1，F2，F3和F4；基于RelyX-Luting的R1，R2，R3和R4），用F1和R1中的HPM或70％/ 30％HPM代替了100％HEMA F2和R2中的/ THFM。F3和R3中的50％HEMA被THFM取代，而F4和R4中的HEMA被30％取代。将所有液体与相应的市售粉末混合。使用傅立叶变换红外光谱（FT-IR）确定转化度。使用粘合盘法测量聚合收缩率和放热。

结果

与包含THFM，家庭和商业材料的实验组合物相比，包含HPM（F1和R1）的组合物显示出较低的转化率（p  <0.0001）。与两组中的所有其他材料相比，FP-commercial的聚合收缩率和放热率均显着更高（p  <0.0001）。与所有材料相比，FP-commercial在5分钟时显示出更高的聚合收缩度和放热度，这是因为引入了额外的交联剂（甘油-二甲基丙烯酸酯）。通常，包含THFM的组合物表现出的聚合收缩率和转化率值与其相应的商品相似。

意义

THFM单体显示出令人鼓舞的结果，并可能在开发具有改进性能的新型RMGIC方面有用。