Mass loss in urethane/TEGDMA- and Bis-GMA/TEGDMA-based resin composites during post-cure heating.
Mass loss in urethane/TEGDMA- and Bis-GMA/TEGDMA-based resin composites during post-cure heating.
复制标题
聚氨酯/TEGDMA 和 Bis-GMA/TEGDMA 基树脂复合材料在后固化加热过程中的质量损失。
DOI：
10.1016/s0109-5641(97)80110-8
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Rueggeberg,FA
中科院分区：
文献类型：
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作者：
Bağis,YH;Rueggeberg,FA
本研究考察了商业UDMA/TEGDMA和Bis-GMA/TEGDMA基树脂复合材料在各种后固化温度下的重量损失。还在升高的温度下测试了单个单体组分的重量损失曲线：Bis-GMA，乙氧基化Bis-GMA（EBis-GMA）、聚氨酯二甲基丙烯酸酯（UDMA）和三甘醇二甲基丙烯酸酯（TEGDMA）。（1 × 5 mm，约50 mg）光固化，然后在热重分析（TGA）装置中在50°、75°、100°、100°和100°下等温后固化。125°或150°C。对于每个产品的每个后固化温度制备单个试样（总共10个盘）。将单个单体组分加热至800°C。填料和有机相的重量百分比通过在TGA中灰化固化的复合材料来确定。使用线性回归分析了树脂体系在各种后固化温度下的重量损失差异。对于每种类型的复合材料，挥发性组分的损失随着后固化温度的升高以及热暴露的持续时间而增加。使用推荐的固化后温度和时间（125°C持续7.5分钟），两种产品之间的重量损失情况没有差异：均表现出1.3%的树脂成分损失。在加热10分钟后，基于Bis-GMA的产品总是表现出比UDMA材料更大的重量损失。重量损失不能归因于任何特定的单体。显著性固化后加热过程中的样品重量损失可能导致修复体表面的可沥滤、未反应材料的耗尽，可能增强该位置的材料性能。这种降低也可能降低可沥滤材料的生物学影响。固化后加热挥发性组分的损失将影响红外光谱技术测定单体转化率值的准确性。
OBJECTIVESThis research examined weight loss of commercial UDMA/TEGDMA- and Bis-GMA/TEGDMA-based resin composites at a variety of post-cure temperatures. Weight loss profiles of individual monomer components were also tested at elevated temperature: Bis-GMA, ethoxylated Bis-GMA (EBis-GMA), urethane dimethacrylate (UDMA), and triethyleneglycol dimethacrylate (TEGDMA).METHODSDisc-shaped composite specimens (1 × 5 mm, approximately 50 mg) were light-cured and then isothermally post-cure heated in a thermogravimetric analysis (TGA) unit at either 50°, 75°, 100°, 125° or 150°C. A single specimen was made for each post-cure temperature for each product (a total of 10 discs). Individual monomer components were heated to 800°C. Filler and organic phase weight percentages were determined by ashing cured composite in the TGA. Weight loss differences between resin systems at various post-cure temperatures were analyzed using linear regression.RESULTSFor each type of composite, loss of volatile component increased with both elevated post-cure temperature as well as duration of heat exposure. Using recommended post-cure temperature and time (125°C for 7.5 minutes), there was no difference in weight loss profile between the two products: both exhibited 1.3% loss of resin component. After 10 min of heating, the Bis-GMA-based product always demonstrated a greater weight loss than the UDMA material. Weight loss could not be attributed to any specific monomer.SIGNIFICANCESpecimen weight loss during post-cure heating may result in a depletion of leachable, unreacted material at the restoration surface, possibly enhancing material properties at that location. This decrease would also potentially reduce the biological impact of leachable materials. Loss of volatile components from post-cure heating would affect the accuracy of infrared spectroscopic techniques in determining monomer conversion values.