Sunnegårdh-Grönberg Karin, Peutzfeldt Anne, van Dijken Jan W V
Department of Odontology, University of Umeå, Umeå, Sweden.
Acta Odontol Scand. 2003 Apr;61(2):87-92. doi: 10.1080/00016350310001424.
The aim of this study was to compare a new restorative cement intended for posterior restorations, Doxadent, with other types of tooth-colored materials as regards flexural strength and flexural modulus. The new restorative material consists mainly of calcium aluminate. Four hybrid resin composites, one polyacid-modified resin composite, one resin-modified glass ionomer cement, one conventional glass ionomer cement, one zinc phosphate cement, and an experimental version as well as the marketed version of Doxadent were investigated. Flexural strength and flexural modulus were tested according to ISO standard 4049 and determined after 1 d, 1 week, and 2 weeks. Together with the zinc phosphate cement, Doxadent had the lowest flexural strengths (13-22 MPa). The strongest materials were the resin composites and the polyacid-modified resin composite (83-136 MPa). The highest flexural modulus was found for Doxadent (17-19 GPa). The flexural strength of Doxadent decreased significantly from 1 week to 2 weeks, while flexural modulus remained unchanged. The other materials reacted in different ways to prolonged water storage. It can be concluded that the restorative cement Doxadent had significantly lower flexural strength and significantly higher flexural modulus than today's materials used for direct posterior restorations.
本研究的目的是比较一种用于后牙修复的新型修复水门汀——多沙登（Doxadent）与其他类型的牙齿颜色材料在弯曲强度和弯曲模量方面的差异。这种新型修复材料主要由铝酸钙组成。研究了四种混合树脂复合材料、一种聚酸改性树脂复合材料、一种树脂改性玻璃离子水门汀、一种传统玻璃离子水门汀、一种磷酸锌水门汀，以及多沙登的实验版本和市售版本。根据ISO标准4049测试弯曲强度和弯曲模量，并在1天、1周和2周后进行测定。与磷酸锌水门汀一样，多沙登的弯曲强度最低（13 - 22兆帕）。强度最高的材料是树脂复合材料和聚酸改性树脂复合材料（83 - 136兆帕）。多沙登的弯曲模量最高（17 - 19吉帕）。多沙登的弯曲强度从第1周到第2周显著下降，而弯曲模量保持不变。其他材料对长时间水储存的反应各不相同。可以得出结论，与当今用于直接后牙修复的材料相比，修复水门汀多沙登的弯曲强度显著更低，弯曲模量显著更高。
