Abstract：
The present study examined different concentrations of the butylated hydroxytoluene (BHT) inhibitor on the kinetics of conversion, polymerization shrinkage stress, and other correlated physicochemical properties of experimental resin composites (ERC). A model composite was formulated with 75 wt% filler containing 0.5 wt% camphorquinone and 1 wt% amine with BHT concentrations of 0.01 wt% (BHT-0.01); 0.1 wt% (BHT-0.1); 0.25 wt% (BHT-0.25); 0.5 wt% (BHT-0.5); 1 wt% (BHT-1), and control (no BHT). They were tested on polymerization shrinkage stress (PSS; n = 5), degree of conversion (DC; n = 3), maximum polymerization rate (RpMAX; n = 5), water sorption (Wsp; n = 0), and solubility (Wsl; n = 10), flexural strength (FS; n = 10), flexural modulus (FM; n = 10), Knoop microhardness (KH; n = 10), and microhardness reduction (HR; n = 10). Data concerning these tests were submitted to one-way ANOVA and Tukey\'s test (α = 0.05; β = 0.2). BHT-0.25, BHT-0.5, and BHT-1 showed a gradually significant decrease in PSS (p = 0.037); however, BHT-1 demonstrated a decrease in the physicochemical properties tested. Thus, within the limitations of this study, it was possible to conclude that BHT concentrations between 0.25 and 0.5 wt% are optimal for reducing shrinkage stress without affecting other physicochemical properties of ERCs.
摘要：
本研究检查了不同浓度的丁基化羟基甲苯（BHT）抑制剂对转化动力学的影响，聚合收缩应力，以及实验树脂复合材料（ERC）的其他相关物理化学性能。用含有0.5重量%樟脑醌和1重量%胺的75重量%填料配制模型复合材料，BHT浓度为0.01重量%(BHT-0.01);0.1重量%(BHT-0.1);0.25重量%(BHT-0.25);0.5重量%(BHT-0.5);1重量%(BHT-1)，和对照（无BHT）。它们在聚合收缩应力(PSS；n=5)上进行了测试，转换度(DC；n=3)，最大聚合速率(RpMAX;n=5)，吸水率(Wsp;n=0)，和溶解度(Wsl;n=10)，弯曲强度（FS；n=10），弯曲模量（FM；n=10），努普显微硬度（KH；n=10），和显微硬度降低(HR；n=10)。有关这些测试的数据提交单因素方差分析和Tukey检验(α=0.05;β=0.2)。BHT-0.25，BHT-0.5和BHT-1显示PSS逐渐显着降低（p=0.037）；然而，BHT-1表现出测试的物理化学性质的降低。因此，在这项研究的局限性内，可以得出结论,0.25和0.5重量%之间的BHT浓度对于降低收缩应力是最佳的,而不影响ERC的其他物理化学性质。
