Development of dental composition resin utilizing low shiriening and low viscous urethane monomears

为评价以新研制的四功能聚氨酯-丙烯酸酯单体为基料的新型低粘度单体混合物的应用价值，以降低单体粘度为重点，对其力学性能和物理性能进行了研究。与双gma - tegdma单体体系生产的CR进行对比，得出以下结论：与双gma - tegdma单体体系的10,000 mPa-s相比，新单体体系的粘度相对较低，为300-600 mPa-s。1)无填料的新型单体混合物所得聚合物的机械强度与双gma基聚合物相似。2)新型单体混合物复合材料的抗压强度与双gma基复合材料相似，但高填料含量复合膏体的粘度明显低于双gma基复合材料。复合材料的抗压强度随填料含量的增加而增加。3)新型单体混合物组成的复合材料的直径抗拉强度明显小于其他单体体系。直径拉伸强度随填料含量的增加而增加。4)复合材料的抗弯强度随填料含量的增加而增加，但由新的单体体系组成的复合材料的抗弯强度趋势不同。5)新型单体混合物复合材料的凝固收缩率明显小于双gma基复合材料。凝固收缩率随填料含量的增加而减小。6)考虑新型单体混合磨损的复合材料凝结收缩率明显小于考虑新型单体混合磨损的复合材料凝结收缩率。bis-GMA基复合材料的凝固收缩率随填料含量的减少而增大。

To evaluate the application of the new low viscosity monomeric mixture, in which newly developed four-functional urethane-acrylate monomer was used as the base material, its mechanical and physical properties were investigated focusing on lowering the viscosity of monomer, and the following conclusions were obtained comparing with CR produced using bis-GMA monomeric mixture :The new monomeric mixtures showed relatively lower viscosity of 300-600 mPa-s in comparison with the bis-GMA-TEGDMA monomer system of 10,000 mPa-s.1) The mechanical strength of polymers obtained from new monomeric mixtures without fillers was similar to those of bis-GMA based polymers.2) The composites consisting of new monomeric mixtures possessed similar compressive strength to the bis-GMA based composites, although the viscosity of composite pastes even in high filler contents was markedly lower than that of bis-GMA based composites. The compressive strength of the composites increased with the filler content.3) The diametral tensile strength of the composite consisting of a new monomeric mixture was significantly smaller than those of other monomeric systems. Diametral tensile strength increased with the filler content.4) The bending strength of the composites increased with the filler content, although the composite consisted of a new monomeric system showed a different bending strength tendency.5) The setting shrinkage of the composites consisting of new monomeric mixtures were significantly smaller than those of the bis-GMA based composites. The setting shrinkage decreased with an increase of the filler contents.6) The setting shrinkage of the composites considerd of new monomer mixtures wear significantly smaller then that of the. bis-GMA based composite The setting shrinkage increased with the decrease of the filler contents.