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Multifunctional monomer acts as co-initiator and crosslinker to provide autonomous strengthening with enhanced hydrolytic stability in dental adhesives.
Dental Materials ( IF 4.6 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.dental.2019.11.007 Linyong Song 1 , Rizacan Sarikaya 2 , Qiang Ye 1 , Anil Misra 3 , Candan Tamerler 2 , Paulette Spencer 2
Dental Materials ( IF 4.6 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.dental.2019.11.007 Linyong Song 1 , Rizacan Sarikaya 2 , Qiang Ye 1 , Anil Misra 3 , Candan Tamerler 2 , Paulette Spencer 2
Affiliation
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OBJECTIVE
The purpose of this study was to evaluate a new synthesized multifunctional monomer, aminosilane functionalized methacrylate (ASMA), containing polymerizable methacrylate, tertiary amine, and methoxysilane functionalities in dental adhesive formulations, and to investigate the polymerization kinetics, leachates, thermal and mechanical properties of copolymers.
METHODS
Adhesive contained HEMA/BisGMA (45/55, w/w) was used as a control, and mixtures based on HEMA/BisGMA/ASMA at the mass ratio of 45/(55-x)/x were used as experimental adhesive. Adhesives were characterized with regard to water miscibility, photo-polymerization behavior (Fourier transform infrared spectroscopy, FTIR), leached co-monomers (high performance liquid chromatography, HPLC), thermal properties (modulated differential scanning calorimeter, MDSC), and mechanical properties (dynamic mechanical analyzer, DMA). Stress relaxation times and the corresponding moduli, obtained from stress relaxation tests, are used in a simulated linear loading case.
RESULTS
As compared to the control, ASMA-containing adhesives showed higher water miscibility, lower viscosity, improved monomer-to-polymer conversion, significantly greater Tg and rubbery modulus. HPLC results indicated a substantial reduction of leached HEMA (up to 85wt%) and BisGMA (up to 55wt%) in ethanol. The simulation reveals that the ASMA-containing adhesive becomes substantially stiffer than the control.
SIGNIFICANCE
ASMA monomer plays multiple roles, i.e. it serves as both a co-initiator and crosslinker while also providing autonomous strengthening and enhanced hydrolytic stability in the adhesive formulations. This multifunctional monomer offers significant promise for improving the durability of the adhesive at the composite/tooth interface.
中文翻译：
多功能单体充当助引发剂和交联剂，以在增强牙科胶粘剂的水解稳定性的同时提供自发增强作用。
目的本研究的目的是评估一种新型的合成多功能单体，即氨基硅烷官能化的甲基丙烯酸酯（ASMA），其在牙科用胶粘剂配方中包含可聚合的甲基丙烯酸酯，叔胺和甲氧基硅烷官能团，并研究聚合动力学，浸出液，热和机械性能共聚物。方法将含有HEMA / BisGMA（45/55，w / w）的胶粘剂作为对照，并以质量比为45 /（55-x）/ x的基于HEMA / BisGMA / ASMA的混合物作为实验胶粘剂。表征了粘合剂的水溶性，光聚合行为（傅里叶变换红外光谱，FTIR），浸出共聚单体（高效液相色谱，HPLC），热性能（调制差示扫描量热仪，MDSC），和机械性能（动态机械分析仪，DMA）。从应力松弛测试中获得的应力松弛时间和相应的模量用于模拟线性载荷情况。结果与对照组相比，含ASMA的胶粘剂显示出更高的水混溶性，更低的粘度，改善的单体到聚合物转化率，显着更高的Tg和橡胶模量。HPLC结果表明，乙醇中浸出的HEMA（至多85wt％）和BisGMA（至多55wt％）显着降低。该模拟显示，含ASMA的粘合剂比对照物变得更加坚硬。意义ASMA单体起着多种作用，即它既可以作为共引发剂，也可以作为交联剂，同时还可以在胶粘剂配方中提供自发的增强作用和增强的水解稳定性。
更新日期：2019-12-03
中文翻译：
多功能单体充当助引发剂和交联剂，以在增强牙科胶粘剂的水解稳定性的同时提供自发增强作用。
目的本研究的目的是评估一种新型的合成多功能单体，即氨基硅烷官能化的甲基丙烯酸酯（ASMA），其在牙科用胶粘剂配方中包含可聚合的甲基丙烯酸酯，叔胺和甲氧基硅烷官能团，并研究聚合动力学，浸出液，热和机械性能共聚物。方法将含有HEMA / BisGMA（45/55，w / w）的胶粘剂作为对照，并以质量比为45 /（55-x）/ x的基于HEMA / BisGMA / ASMA的混合物作为实验胶粘剂。表征了粘合剂的水溶性，光聚合行为（傅里叶变换红外光谱，FTIR），浸出共聚单体（高效液相色谱，HPLC），热性能（调制差示扫描量热仪，MDSC），和机械性能（动态机械分析仪，DMA）。从应力松弛测试中获得的应力松弛时间和相应的模量用于模拟线性载荷情况。结果与对照组相比，含ASMA的胶粘剂显示出更高的水混溶性，更低的粘度，改善的单体到聚合物转化率，显着更高的Tg和橡胶模量。HPLC结果表明，乙醇中浸出的HEMA（至多85wt％）和BisGMA（至多55wt％）显着降低。该模拟显示，含ASMA的粘合剂比对照物变得更加坚硬。意义ASMA单体起着多种作用，即它既可以作为共引发剂，也可以作为交联剂，同时还可以在胶粘剂配方中提供自发的增强作用和增强的水解稳定性。
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