DENTAL COMPOSITES BASED ON RIGID, HYPERBRANCHED POLYMERS

描述：(摘自申请者的摘要)牙科复合修复体 已被广泛用作牙科汞合金的美容替代品。然而， 需要提高这些材料的耐用性和寿命。 因为最终的修复剂必须具有可接受的处理特性 对于牙医来说，任何用来改善修复剂性能的方法 不得显著增加粘度。线型聚合物的添加 TO牙科复合体提高了修复剂的物理性能； 然而，经常观察到随之而来的粘度增加，这阻碍了 这些材料的临床应用。然而，超支化聚合物是一种 新型高支化聚合物材料，保持相对较低 溶液或熔体粘度不随增加而显著增加 以分子量计。这项提案将确立甲基丙烯酸酯的能力 商业化的超强增韧聚合物改善牙科的性能 恢复剂，同时保持较低的功能粘度。在此之后 初步研究，高性能超增韧聚合物，尽管是刚性的 分子内氢键，将被合成以进一步增强 修复剂的性质。这些改性的超高分子聚合物将是 用双GMA-TEGDMA配制，并对其物理性能进行评估 使用标准技术。据预计，超强的修改 BISGMA-TEGDMA将展示可预期的改进性能 但这些材料不会经历任何 粘度显著增加。

DESCRIPTION: (Adapted from applicant's abstract) Dental composite restoratives have found wide use as an aesthetic substitute for dental amalgams. However, there is need to improve the durability and longevity of these materials. Because the final restorative must have handling properties that are acceptable to the dentist, any method used to improve the properties of the restorative must not significantly increase the viscosity. The addition of linear polymers to dental composites increases the physical properties of restoratives; however, a concomitant increase in viscosity is often observed which impedes the clinical application of these materials. However, hyperbranched polymers, a new class of high-branched polymeric materials, maintain relatively low solution or melt viscosities that do not increase significantly with increases in molecular weight. This proposal will establish the ability of methacrylated commercial hyperbranced polymers to improve the properties of dental restoratives while maintaining a low, functional viscosity. Following these preliminary studies, high performance hyperbranced polymers, rigidified though intramolecular hydrogen bonding, will be synthesized to further enhance the properties of the restoratives. These modified hyperbranced polymers will be formulated with BisGMA-TEGDMA and the physical properties will be evaluated using standard techniques. It is anticipated that the hyperbranced modified BisGMA-TEGDMA will demonstrate the improved properties that can be expected from high molecular weight polymers but these materials will not experience any significant increase in viscosity.