Effects of quaternary ammonium-methacrylates on the mechanical properties of unfilled resins.
Effects of quaternary ammonium-methacrylates on the mechanical properties of unfilled resins.
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DOI：
10.1016/j.dental.2014.08.365
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发表时间：
2014-11
期刊：
影响因子：
5
通讯作者：
Pashley, David H.
中科院分区：
文献类型：
--
作者：
Hoshika, Tomohiro;Nishitani, Yoshihiro;Yoshiyama, Masahiro;Key, William O., III;Brantley, William;Agee, Kelli A.;Breschi, Lorenzo;Cadenaro, Milena;Tay, Franklin R.;Rueggeberg, Frederick;Pashley, David H.
关键词：
将抗微生物/抗MMP季铵甲基丙烯酸酯（QAM）添加到共聚单体共混物中不应削弱牙科树脂的机械性能。本工作评价了含有0-15质量%QAM A-E（A：2-丙烯酰氧基乙基三甲基氯化铵; B：[3-（甲基丙烯酰氨基）丙基]三甲基氯化铵; C：[2-（甲基丙烯酰氧基）乙基]三甲基氯化铵; D：二烯丙基二甲基氯化铵; E：2-（甲基丙烯酰氧基）乙基三甲基甲基硫酸铵）的BisGMA/TEGDMA/HEMA（60：30：10）的转化度和机械性能。将具有和不具有QAM的未填充树脂置于ATR-FTIR上，并在30°C下在薄膜中光聚合20秒。未填充的树脂梁由方形中空玻璃管铸造而成。一半的梁在干燥3天后进行测试（对照）;另一半在水储存3天后进行湿测试。在对照树脂中添加QAM显著增加了光终止后600秒的转化率，5%MAPTAC除外（p<0.05）。制剂中QAM含量的增加显著增加了转化率。对照梁给出了约700 MPa的干杨氏模量。除了5% B或C之外，添加5、10或15质量%的QAM产生干杨氏模量的显著降低。15质量%的A、B和C使树脂梁的湿杨氏模量降低超过30%。对照干树脂的极限拉伸应力（UTS）为89±11 MPa。添加5-10质量%的QAM对干燥UTS没有不利影响。在水储存后，所有树脂共混物的UTS显著下降（p<0.05），尤其是当添加15wt%QAM时。对照干梁的断裂韧性（KIC）值为0.88±0.1 MPa·m。湿值显著较高，为1.02±0.06（p<0.05）。干梁的KIC从5%QAM的0.85±0.08变化到15%QAM的0.49±0.05。湿梁的KIC值为1.02±0.06 MPa·m，在15%QAM时降至0.23±0.01。添加10%QAM增加了未填充树脂的转化程度，但降低了湿韧性和UTS;添加15%QAM降低了湿树脂的机械性能低于可接受的水平。
Adding antimicrobial/anti-MMP quaternary ammonium methacrylates (QAMs) to comonomer blends should not weaken the mechanical properties of dental resins. This work evaluated the degree conversion and mechanical properties of BisGMA/TEGDMA/HEMA (60:30:10) containing 0–15 mass% QAMs A–E (A:2-acryloxyethyltrimethyl ammonium chloride; B:[3-(methacryloylamino)propyl]trimethylammonium chloride; C:[2-(methacryloxy)ethyl] trimethyl ammonium chloride; D:diallyldimethyl ammonium chloride; E:2-(methacryloyloxy) ethyltrimethyl ammonium methyl sulfate. Unfilled resins with and without QAM were placed on ATR-FTIR and light-polymerized for 20 s in a thin film t 30°C. Unfilled resin beams were casted from square hollow glass tubings. Half of the beams were tested after 3 days of drying (control); the other half were tested wet after 3 days of water storage. Addition of QAMs in control resins significantly increased conversion 600s after light termination, with the exception of 5% MAPTAC (p<0.05). Increase of QAM content within a formulation significantly increased conversion. Control beams gave dry Young’s moduli of ~700 MPa. Addition of 5, 10 or 15 mass% QAMs produced significant reductions in dry Young’s moduli except for 5% B or C. 15 mass% A, B and C lowered the wet Young’s moduli of the resin beams by more than 30%. The ultimate tensile stress (UTS) of control dry resin was 89±11 MPa. Addition of 5–10 mass% QAMs had no adverse effect on the dry UTS. After water storage, the UTS of all resin blends fell significantly (p<0.05), especially when 15 wt% QAMs was added. Control dry beams gave fracture toughness (KIC) values of 0.88±0.1 MPa√m. Wet values were significantly higher at 1.02±0.06 (p<0.05). KIC of dry beams varied from 0.85±0.08 at 5% QAMs to 0.49±0.05 at 15% QAMs. Wet beams gave KIC values of 1.02±0.06 MPa√m that fell to 0.23±0.01 at 15% QAMs. Addition of 10% QAMs increased the degree of conversion of unfilled resins, but lowered wet toughness and UTS; addition of 15% QAMs lowered the mechanical properties of wet resins below acceptable levels.
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