Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Division of Biomedical Materials, School of Dental Medicine, East Carolina University, Greenville, NC, USA.
Clin Oral Investig. 2022 Jan;26(1):957-967. doi: 10.1007/s00784-021-04078-1. Epub 2021 Jul 21.
The aim of this study was to investigate the mechanical, chemical, optical, and adhesive properties of BisGMA-free experimental resin composites containing Exothane-24-an elastomeric urethane monomer-and different co-initiators.
A blend of urethane dimethacrylate (UDMA), extended dimethacrylate urethane (PEG 400), triethylene glycol dimethacrylate (TEGDMA), and camphorquinone was prepared. Two different co-initiators-dimethyl aminoethyl methacrylate (DMAEMA) or 4-N alcohol, N-dimethylamine phenylethyl (DMPOH)-were added to the blend. Exothane-24 monomer was added to the blend for each co-initiator and four groups were established as follows: DMAEMA; DMAEMA + Exothane; DMPOH; and DMPOH + Exothane. Specimens were photo-activated using a multi-wave LED light-curing unit (VALO; 954 mW/cm of irradiance). Mechanical (ultimate tensile strength, flexural strength, flexural modulus and hardness), chemical (degree of conversion, hardness reduction, water sorption and solubility), optical (color change), and adhesive (microtensile bond strength) properties were analyzed. Data were submitted to two-way ANOVA and Tukey's test (α = 0.05).
The resin composite containing DMPOH and Exothane-24 showed similar or superior performance to those of the other experimental composites for mechanical and chemical properties, except for flexural strength. It also showed less color change and greater micro-tensile bond strength.
Among the combinations tested, the BisGMA-free resin composite containing Exothane-24 combined with the DMPOH co-initiator showed the best mechanical, chemical, optical, and adhesive properties. Clinical relevance Exothane-24 monomer and DMPOH co-initiator could be useful in the formulation of BisGMA-free resin composites in order to minimize exposure to BPA.
本研究旨在研究含有 Exothane-24（一种弹性氨酯单体）和不同共引发剂的 BisGMA 无实验性树脂复合材料的机械、化学、光学和粘合性能。
制备了包含氨酯二甲基丙烯酸酯（UDMA）、扩链二甲基丙烯酸酯氨酯（PEG 400）、三乙二醇二甲基丙烯酸酯（TEGDMA）和樟脑醌的混合物。将两种不同的共引发剂二甲氨基乙基甲基丙烯酸酯（DMAEMA）或 4-N 醇、N-二甲基胺苯乙基（DMPOH）加入混合物中。对于每个共引发剂，将 Exothane-24 单体添加到混合物中，并建立了以下四个组：DMAEMA；DMAEMA+Exothane；DMPOH；和 DMPOH+Exothane。使用多波 LED 光固化装置（VALO；954 mW/cm 的辐照度）对样品进行光激活。分析机械性能（极限拉伸强度、弯曲强度、弯曲模数和硬度）、化学性能（转化率、硬度降低、吸水率和溶解度）、光学性能（颜色变化）和粘合性能（微拉伸粘合强度）。数据采用双因素方差分析和 Tukey 检验（α=0.05）。
含有 DMPOH 和 Exothane-24 的树脂复合材料在机械和化学性能方面与其他实验性复合材料相似或表现更优，除了弯曲强度。它还显示出较少的颜色变化和较大的微拉伸粘合强度。
在所测试的组合中，含有 Exothane-24 的 BisGMA 无树脂复合材料与 DMPOH 共引发剂的组合表现出最佳的机械、化学、光学和粘合性能。临床相关性：Exothane-24 单体和 DMPOH 共引发剂可用于 BisGMA 无树脂复合材料的配方中，以尽量减少对 BPA 的暴露。
