Peutzfeldt A, Asmussen E
Department of Dental Materials and Technology, Royal Dental College, Copenhagen, Denmark.
J Dent Res. 1991 Dec;70(12):1537-41. doi: 10.1177/00220345910700121201.
Resin composites are still in need of improved abrasion resistance for them to be ideal restorative materials for use in large occlusal cavities. The present study proposes a concept for additional cross-linking of dental monomers, by which mechanical properties and possibly the resistance to abrasion of the resin composites are increased. Cyclic acid anhydrides were added as cross-linking agents to different monomer mixtures, which were then loaded with filler. The monomer mixtures were varied with respect to type and ratio of monomer and anhydride. For measurement of diametral tensile strength, flexural strength, modulus of elasticity, and modulus of resilience, specimens were initially cured by light and then post-cured for one h at 150 degrees C. Resin composites based on UEDMA and HEMA were found to be superior to BISGMA- and TEGDMA-based composites. Increases in mechanical properties were highest when unsaturated anhydrides were used. An optimal effect of anhydride addition was found in resin composites also containing methacrylamide. Such materials resulted in a 20% increase in the mechanical properties investigated.
树脂复合材料仍需要提高耐磨性，以便成为用于大型咬合洞的理想修复材料。本研究提出了一种牙科单体额外交联的概念，通过这种方法可以提高树脂复合材料的机械性能以及可能的耐磨性。将环状酸酐作为交联剂添加到不同的单体混合物中，然后加入填料。单体混合物在单体和酸酐的类型和比例方面有所不同。为了测量径向拉伸强度、弯曲强度、弹性模量和回弹模量，试样首先通过光照固化，然后在150℃下后固化1小时。发现基于UEDMA和HEMA的树脂复合材料优于基于BISGMA和TEGDMA的复合材料。使用不饱和酸酐时，机械性能的提高最为显著。在还含有甲基丙烯酰胺的树脂复合材料中发现了酸酐添加的最佳效果。这类材料在所研究的机械性能方面提高了20%。
