Objective

To assess the mechanical properties of two different dimethacrylate resin blends containing the photosensitizer camphorquinone (CQ) alone or in combination with one or more synergists including an amine and/or an iodonium.

Methods

Two co-monomer resin blends were formulated using Bis-GMA/TEGDMA and UDMA/TEGDMA, both at 1:1 mass ratio. Each resin blend was divided into four groups, comprising the following four photoinitiation systems: (1) CQ + 2-(dimethylamino)ethyl methacrylate (DMAEMA); (2) CQ + DMAEMA + bis(4-methyl phenyl)iodonium hexafluorophosphate (BPI); (3) CQ; and (4) CQ + BPI. Materials were evaluated for polymerisation kinetics, water sorption, solubility, flexural strength and modulus.

Results

BisGMA/TEGDMA with CQ showed minimal and insignificant degree of conversion and was not tested for water sorption/solubility and mechanical properties. The ternary system (i.e., CQ + DMAEMA + BPI), promoted the highest degree of conversion for each monomer blend. The resins containing amine had higher mechanical properties than the amine free. However, the UDMA amine free resins exhibited greater flexural strength and modulus than the corresponding amine free BisGMA resins. BisGMA/TEGDMA containing CQ + DMAEMA or CQ + BPI had significantly higher water sorption and solubility than the other groups.

Significance

Resins containing amine presented better properties than the amine-free systems. The addition of iodonium salt (BPI) improved the degree of conversion of the resins, even without an amine co-initiator. The amine-free initiator system (CQ + BPI) was more effective when used with UDMA versus BisGMA based-resins respectively.

中文翻译：

---

用无胺光引发系统配制的牙科树脂的物理化学性质

客观的

评估单独含有光敏剂樟脑醌 (CQ) 或与一种或多种增效剂（包括胺和/或碘鎓）组合的两种不同二甲基丙烯酸酯树脂共混物的机械性能。

方法

使用 Bis-GMA/TEGDMA 和 UDMA/TEGDMA 以 1:1 的质量比配制两种共聚单体树脂共混物。每种树脂共混物分为四组，包括以下四种光引发体系： (1) CQ + 2-(二甲氨基)乙基甲基丙烯酸酯 (DMAEMA)；(2) CQ + DMAEMA + 双（4-甲基苯基）碘鎓六氟磷酸（BPI）；(3) CQ；(4) CQ + BPI。对材料的聚合动力学、吸水性、溶解性、弯曲强度和模量进行了评估。

结果

带有 CQ 的 BisGMA/TEGDMA 显示出最小和微不足道的转化程度，并且没有测试吸水/溶解度和机械性能。三元体系（即 CQ + DMAEMA + BPI）促进了每种单体混合物的最高转化率。含胺的树脂比不含胺的树脂具有更高的机械性能。然而，UDMA 无胺树脂比相应的无胺 BisGMA 树脂表现出更大的弯曲强度和模量。含有 CQ + DMAEMA 或 CQ + BPI 的 BisGMA/TEGDMA 比其他组具有显着更高的吸水率和溶解度。

意义

含胺的树脂比不含胺的系统具有更好的性能。即使没有胺共引发剂，碘鎓盐 (BPI) 的添加也提高了树脂的转化程度。与基于 BisGMA 的树脂相比，无胺引发剂系统 (CQ + BPI) 分别与 UDMA 和 BisGMA 基树脂一起使用时更有效。