Asmussen E, Peutzfeldt A
Department of Dental Materials, University of Copenhagen, Denmark.
Dent Mater. 1998 Jan;14(1):51-6. doi: 10.1016/s0109-5641(98)00009-8.
This study was conducted to determine the effect of UEDMA, BisGMA and TEGDMA on selected mechanical properties of experimental resin composites.
Thirty monomer mixtures of TEGDMA and BisGMA and/or UEDMA were produced. Five base monomer mixtures had the following molar relationships between TEGDMA and BisGMA: 30:70, 40:60, 50:50, 60:40 and 70:30. Monomer mixtures were then produced in which BisGMA was successively substituted by UEDMA, 10 mol% at a time. The resins were made light-curing and loaded with filler. Diametral tensile strength, flexural strength and modulus of elasticity were determined on 1 week old specimens. The results were analyzed by ANOVA and by response surface methodology.
The diametral tensile strength of the resin composites varied between 52 and 59 MPa, the flexural strength between 137 and 167 MPa, and the modulus of elasticity between 8.0 and 11.1 GPa. The statistical analyses showed that substitution of BisGMA or TEGDMA by UEDMA resulted in an increase in tensile and flexural strength, and that substitution of BisGMA by TEGDMA increased tensile, but reduced flexural strength. Further, it was found that, for a given content of UEDMA, variations in the ratio BisGMA/TEGDMA gave rise to a maximum in modulus of elasticity. The size of this maximum in modulus decreased with increasing content of UEDMA.
Varying the relative amounts of UEDMA, BisGMA and TEGDMA has a significant effect on the mechanical properties of the resin composition. Thus, by selecting specific combinations of these components, it may be possible to design composites with properties that are tailor made to specific applications.
本研究旨在确定二甲基丙烯酸二缩三乙二醇酯（UEDMA）、双酚A二甲基丙烯酸缩水甘油酯（BisGMA）和三乙二醇二甲基丙烯酸酯（TEGDMA）对实验性树脂复合材料选定力学性能的影响。
制备了30种TEGDMA与BisGMA和/或UEDMA的单体混合物。5种基础单体混合物中TEGDMA与BisGMA的摩尔比分别为：30:70、40:60、50:50、60:40和70:30。然后制备单体混合物，其中BisGMA每次依次被UEDMA以10 mol%的比例取代。将树脂制成光固化型并填充填料。对1周龄的试样测定径向拉伸强度、弯曲强度和弹性模量。结果通过方差分析和响应面法进行分析。
树脂复合材料的径向拉伸强度在52至59 MPa之间变化，弯曲强度在137至167 MPa之间变化，弹性模量在8.0至11.1 GPa之间变化。统计分析表明，用UEDMA取代BisGMA或TEGDMA会导致拉伸强度和弯曲强度增加，而用TEGDMA取代BisGMA会增加拉伸强度，但降低弯曲强度。此外，还发现，对于给定的UEDMA含量，BisGMA/TEGDMA比例的变化会导致弹性模量出现最大值。随着UEDMA含量的增加，该模量最大值的大小减小。
改变UEDMA、BisGMA和TEGDMA的相对含量对树脂组合物的力学性能有显著影响。因此，通过选择这些组分的特定组合，有可能设计出具有适合特定应用性能的复合材料。
