Heinrich-Heine-University, Medical Faculty, Centre of Dentistry, Department of Operative and Preventive Dentistry and Endodontics, Moorenstraße 5, D-40225 Düsseldorf, Germany.
Heinrich-Heine-University, Medical Faculty, Centre of Dentistry, Department of Operative and Preventive Dentistry and Endodontics, Moorenstraße 5, D-40225 Düsseldorf, Germany.
Dent Mater. 2014 Jun;30(6):702-7. doi: 10.1016/j.dental.2014.03.009. Epub 2014 Apr 24.
To investigate contact angle and surface free energy of experimental dental resin composites containing novel delivery systems of polymeric hollow beads and low-surface tension agents after chewing simulation test.
A delivery system of novel polymeric hollow beads differently loaded with two low-surface tension agents was used in different amounts to modify commonly formulated experimental dental resin composites. The non-modified resin was used as standard. Surface roughness Ra, contact angle Θ, total surface free energy γS, its apolar γS(LW), polar γS(AB), Lewis acid γS(+) and base γS(-) terms were determined and the results prior to and after chewing simulation test were compared. Significance was p<0.05.
After chewing simulation Ra increased, Θ decreased, Ra increased for two test materials and γS decreased or remained constant for the standard or the test materials after chewing simulation. Ra of one test material was higher than of the standard, Θ and γS of the test materials remained lower than of the standard and, indicating their highly hydrophobic character (Θ≈60-75°, γS≈30mJm(-2)). γS(LW), and γS(-) of the test materials were lower than of the standard. Some of the test materials had lower γS(AB) and γS(+) than of the standard.
Delivery systems based on novel polymeric hollow beads highly loaded with low-surface tension agents were found to significantly increase contact angle and thus to reduce surface free energy of experimental dental resin composites prior to and after chewing simulation test.
研究含有新型聚合中空珠和低表面张力剂输送系统的实验性牙科树脂复合材料的接触角和表面自由能，经咀嚼模拟试验后。
采用新型聚合中空珠的输送系统，不同程度地装载两种低表面张力剂，以不同的量来修饰常用配方的实验性牙科树脂复合材料。未修饰的树脂用作标准。测定表面粗糙度 Ra、接触角 Θ、总表面自由能 γS、非极性 γS(LW)、极性 γS(AB)、路易斯酸 γS(+)和碱基 γS(-)项，并比较咀嚼模拟试验前后的结果。p<0.05 有统计学意义。
咀嚼模拟后 Ra 增加，Θ 减小，两种试验材料的 Ra 增加，标准或试验材料的 γS 在咀嚼模拟后减小或保持不变。一种试验材料的 Ra 高于标准，试验材料的 Θ 和 γS 仍低于标准，表明其具有高度疏水性（Θ≈60-75°，γS≈30mJm(-2)）。γS(LW)和γS(-)低于标准。一些试验材料的 γS(AB)和 γS(+)低于标准。
研究发现，高负荷新型聚合中空珠的输送系统显著增加了实验性牙科树脂复合材料的接触角，从而降低了其在咀嚼模拟前后的表面自由能。
