Characterization of methacrylate-based composites containing thio-urethane oligomers
Characterization of methacrylate-based composites containing thio-urethane oligomers
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DOI：
10.1016/j.dental.2015.11.022
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发表时间：
2016-02-01
期刊：
影响因子：
5
通讯作者：
Pfeifer, Carmem S.
中科院分区：
文献类型：
--
作者：
Bacchi, Atais;Nelson, Morgan;Pfeifer, Carmem S.
Objective.评价硫代氨基甲酸酯低聚物改善修复复合树脂性能的能力。通过将1，6-己二醇-二异氰酸酯（脂肪族）与季戊四醇四-3-巯基丙酸酯（PETMP）或1，3-双（1-异氰酸酯基-1-甲基乙基）苯（芳香族）与正-三-3-巯基丙酸酯（TMP）以1：2异氰酸酯：硫醇组合来合成低聚物，留下侧基硫醇。将低聚物以0-20重量%添加到BisGMATEGDMA（70-30重量%）中。加入硅烷化的无机填料（70重量%）。将材料在800 mW/cm（2）下光活化，过滤至320-500 nm。近红外光谱用于跟踪甲基丙烯酸酯转化率（DC）。根据ISO 4049在三点弯曲中用2 mm X 2 mm X 25 mm棒评估机械性能的挠曲强度/模量和韧性（FS/E和T），并用2 mm X 5 mm X 25 mm缺口试样评估断裂韧性（KO.在Bioman上测量聚合应力（PS）。用ANOVA/Tukey检验（α = 5%）分析结果。结果：在含硫代氨基甲酸酯的材料中观察到DC的显著增加，特别是对于具有20wt%脂肪族版本的组。由低聚物组成的材料也促进了更高的FS，E和K-1C相比，无论硫代氨基甲酸酯类型的控制。通过ANOVA检测到韧性的显著增加，但在组中没有区分。几乎所有组的PS均因硫代氨基甲酸酯的存在而显著降低。使用硫代氨基甲酸酯低聚物组成甲基丙烯酸酯基修复复合物促进DC、FS、E和K-1C的增加，同时显著降低PS。意义一种简单的添加剂被证明可以降低应力，同时增加对流和机械性能，主要是断裂韧性。这有可能增加牙科复合材料的使用寿命，而不改变目前的手术程序。(C)2015年牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objective. To evaluate the ability of thio-urethane oligomers to improve the properties of restorative composite resins.Methods. Oligomers were synthesized by combining 1,6-hexanediol-diissocyante (aliphatic) with pentaerythritol tetra-3-mercaptopropionate (PETMP) or 1,3-bis(1-isocyanato-1-methylethyl)benzene (aromatic) with trimethylol-tris-3-mercaptopropionate (TMP), at 1:2 isocyanate:thiol, leaving pendant thiols. Oligomers were added at 0-20 wt% to BisGMATEGDMA (70-30 wt%). Silanated inorganic fillers were added (70 wt%). Materials were photoactivated at 800 mW/cm(2) filtered to 320-500 nm. Near-IR was used to follow degree of methacrylate conversion (DC). Mechanical properties were evaluated in three-point bending with 2 mm x 2 mm x 25 mm bars for flexural strength/modulus and toughness (FS/E, and T) according to ISO 4049, and 2 mm x 5 mm x 25 mm notched specimens for fracture toughness (KO. Polymerization stress (PS) was measured on the Bioman.Results were analyzed with ANOVA/Tukey's test (alpha = 5%). Results.Significant increase in DC was observed in thio-urethane-containing materials especially for the group with 20 wt% of aliphatic version. Materials composed by oligomers also promoted higher FS, E, and K-1C in comparison to controls irrespective of thio-urethane type. A significant increase in toughness was detected by ANOVA, but not distinguished in the groups. The PS was significantly reduced by the presence of thio-urethane for almost all groups.Conclusions. The use of thio-urethane oligomer to compose methacrylate-based restorative composite promote increase in DC, FS, E and K-1C while significant reduces PS. Significance. A simple additive was shown to reduce stress while increasing convrersion and mechanical properties, mainly fracture toughness. This has he potential of increasing the service life of dental composites, without changing current operatory procedures. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.