商用和实验性树脂改性玻璃离子水门汀（RMGIC）的聚合收缩动力学和转化率。

Polymerization shrinkage kinetics and degree of conversion of commercial and experimental resin modified glass ionomer luting cements (RMGICs).

机构信息

Dental Physical Sciences Unit, Queen Mary University of London, E1 4NS, United Kingdom.

出版信息

Dent Mater. 2020 Jul;36(7):893-904. doi: 10.1016/j.dental.2020.04.010. Epub 2020 May 24.

DOI:10.1016/j.dental.2020.04.010

PMID:32461097

Abstract

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 5min 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.

摘要

目的

四氢糠基甲基丙烯酸酯（THFM）和羟丙基甲基丙烯酸酯（HPM）被用于部分或完全替代实验性 RMGIC 中的 HEMA。实验材料在转化率、聚合收缩和放热方面与国产和进口产品进行了比较。

方法

使用了两种市售的 RMGIC，即富士玻璃离子水门汀（FP，GC，日本）和瑞邦树脂水门汀（RX，3M-ESPE，美国）。基于商业材料的液体，还制备了另外两种国产液体。制备了 8 种实验性液体成分（基于富士玻璃离子水门汀的 F1、F2、F3 和 F4；基于瑞邦树脂水门汀的 R1、R2、R3 和 R4），用 HPM 替代 F1 和 R1 中的 100%HEMA，或用 F2 和 R2 中的 70%/30% HPM/THFM 替代。与 F4 和 R4 中的 30%相比，F3 和 R3 中用 THFM 替代了 50%的 HEMA。所有液体均与相应的商用粉末混合。使用傅里叶变换红外光谱（FT-IR）法测定转化率。使用粘结盘法测定聚合收缩和放热。

结果

含 HPM（F1 和 R1）的成分与含 THFM、国产和进口材料的实验成分相比，转化率较低（p<0.0001）。与两组中所有其他材料相比，FP 商用材料的聚合收缩和放热明显更高（p<0.0001）。由于加入了额外的交联剂（甘油二甲基丙烯酸酯），FP 商用材料在 5 分钟时的聚合收缩和放热更高。一般来说，含 THFM 的成分的聚合收缩和转化率值与相应的商用产品相似。