Characterization of the chemical interactions betwen 4-MET and enamel by Raman spectroscopy.
Characterization of the chemical interactions betwen 4-MET and enamel by Raman spectroscopy.
复制标题
通过拉曼光谱表征 4-MET 和牙釉质之间的化学相互作用。
DOI：
10.1016/0109-5641(95)80017-4
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Morris,MD
中科院分区：
文献类型：
--
作者：
Leung,Y;Morris,MD
本研究的目的是利用拉曼光谱研究偏苯三酸三甲酯(4-MET)的水解物4-甲基丙烯氧乙基偏苯三酸乙酯(4-MET)与牛牙釉质粉末和合成含碳酸盐磷灰石等粉末基质之间的相互作用。方法将粉末样品在4-MET/甲基丙烯酸甲酯(MMA)溶液中浸泡15min、3h和24h，干燥后进行光谱分析。结果样品经24 h润湿后的光谱强烈表明，样品表面的钙离子与4-MET之间存在较强的离子相互作用。然而，15分钟的样品的光谱表明，只有一定程度的氢键。3-h 4-MET/牙釉质粉末样品的光谱特征介于两者之间。意义本文提出的结果表明，4-MET与牙科基质之间的盐分形成不太可能是瞬时的。相反，这种反应的速度可能比共聚单体的聚合速度慢得多，因此在临床条件下不重要。因此，在4-MET/MMA树脂体系中，4-MET的作用似乎是通过氢键润湿牙齿表面，从而允许MMA单体扩散并更深地渗透到牙齿表面。该系统的主要结合机制更可能是由于微机械锁定机制。
ObjectivesThe goal of this investigation was to use Raman spectroscopy to study the chemical interactions between 4-methacryloxyethyl trimellitic acid (4-MET), a hydrolized form of 4-methacryloxyethyl trimellitate anhydride (4-META) and powdered substrates such as bovine enamel powder and synthetic carbonate-containing apatite.MethodsPowdered samples were prepared by immersing them in 4-MET/methyl methacrylate (MMA) solution for 15 min, 3 h and 24 h. They were then dried for spectroscopy. An experimental Raman microprobe equipped with a cryogenically-cooled camera was employed to acquire spectra of the samples.ResultsSpectra of samples wetted for 24 h strongly indicate that there is strong ionic interaction between Ca2+ions on the powdered sample surface and 4-MET. Spectra of the 15-min samples, however, suggest only some degree of hydrogen bonding. The spectrum of the 3-h 4-MET/enamel powder sample showed features intermediate between the two.SignificanceResults presented in this paper show that salt formation between 4-MET and dental substrates is not likely to be instantaneous. On the contrary, the rate of such reaction is probably too slow relative to that of polymerization of the co-monomers to be important under clinical conditions. The function of the 4-MET in the 4-MET/MMA resin system appears, therefore, to be wetting the tooth surface through hydrogen bonding, which then allows MMA monomers to diffuse and penetrate deeper through the surfaces. The primary bonding mechanism of this system is more likely due to a micro-mechanical locking mechanism.