Bertolo Marcus Vinicius Loureiro, Moraes Rita de Cássia Martins, Pfeifer Carmem, Salgado Vinícius Esteves, Correr Ana Rosa Costa, Schneider Luis Felipe J
Department of Restorative Dentistry, Dental Materials Area, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
Braz Dent J. 2017 Jan-Feb;28(1):35-39. doi: 10.1590/0103-6440201700841.
The aim of this study was to determine the influence of photoinitiator systems on physical-chemical properties of flowable composites. Conventional (CFC), composed by bisphenol-glycidyl dimethacrylate (BisGMA)+triethyleneglycol dimethacrylate (TEGDMA), and self-adhesive (SAFC), composed by BisGMA+TEDGMA+bis{2-(methacryloyloxy) ethyl} phosphate (2MP), flowable composites were developed. Five photoinitiator systems were tested: camphorquinone (CQ), ethyl-4-dimethylaminobenzoate (EDMAB), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), phenylbis (2,4,6-trimethylbenzoyl)phosphine oxide (BAPO), CQ+EDMAB+TPO and CQ+EDMAB+BAPO. A two-peak LED was used; degree of conversion (DC) and the maximum polymerization rate (RPmax) were determined by near infrared spectroscopy. For the yellowing degree a spectrophotometer was used. Water sorption (Wsp) was obtained after 30 days of water storage (n=5). Data were submitted to two-way analysis of variance and Tukey's test (a=0.05). BAPO presented the highest DC and RPmax values for both series. SAFCs presented lower DC and RPmax for CQ+EDMAB-based materials. Greater yellowing was observed for SAFCs compared with CFCs, except for BAPO. Greater Wsp was observed for SAFCs compared with CFCs. The photoinitiator did not influence Wsp for CFCs, but TPO and BAPO presented the highest Wsp in SAFCs. The photoinitiator system affected differently the physical-chemical properties of CFCs and SAFCs.
本研究的目的是确定光引发体系对可流动复合树脂物理化学性能的影响。制备了传统型（CFC）可流动复合树脂，其由双酚 - 二甲基丙烯酸缩水甘油酯（BisGMA）+三乙二醇二甲基丙烯酸酯（TEGDMA）组成，以及自粘性型（SAFC）可流动复合树脂，其由BisGMA + TEDGMA + 双{2 - （甲基丙烯酰氧基）乙基}磷酸酯（2MP）组成。测试了五种光引发体系：樟脑醌（CQ）、4 - 二甲基氨基苯甲酸乙酯（EDMAB）、二苯基（2,4,6 - 三甲基苯甲酰基）氧化膦（TPO）、苯基双（2,4,6 - 三甲基苯甲酰基）氧化膦（BAPO）、CQ + EDMAB + TPO以及CQ + EDMAB + BAPO。使用了双峰发光二极管；通过近红外光谱法测定转化率（DC）和最大聚合速率（RPmax）。使用分光光度计测定变黄程度。在水储存30天后获得吸水率（Wsp）（n = 5）。数据进行双向方差分析和Tukey检验（α = 0.05）。对于两个系列，BAPO均呈现出最高的DC和RPmax值。基于CQ + EDMAB的材料，SAFCs的DC和RPmax较低。与CFCs相比，SAFCs除了BAPO外，观察到更大程度的变黄。与CFCs相比，SAFCs观察到更高的Wsp。光引发剂对CFCs的Wsp没有影响，但TPO和BAPO在SAFCs中呈现出最高的Wsp。光引发体系对CFCs和SAFCs的物理化学性能有不同的影响。
