Gröger Gerhard, Rosentritt Martin, Behr Michael, Schröder Josef, Handel Gerhard
Department of Prosthetic Dentistry, Clinic of the University of Regensburg, D-93042, Regensburg, Germany.
J Mater Sci Mater Med. 2006 Sep;17(9):825-8. doi: 10.1007/s10856-006-9841-2.
Dental resins deteriorate clinically due to chewing forces, temperature changes, chemical agents or biological attack. Findings concerning these influences on the different components of a resin are limited. The aim of this study was to evaluate an alternative method for assessing the influence of the oral cavity on dental materials and their individual components as well as analyzing degradation effects over time. Seven dental composite and resin materials were inserted into the upper complete dentures of two subjects and evaluated after one year with a transmission electron microscope. The various resin components showed different degrees or deterioration. Composites with an urethandimethacrylate matrix were less vulnerable. A layer of salivary proteins (pellicle) was found on all materials but the polymethylmethacrylate reference. An accumulation of pellicle on filler particles and the crevice between filler and matrix was noted. We conclude that the tested method is effective for evaluating the interaction between the material's components and the biological environment. Further studies are needed to confirm these observations.
牙科树脂在临床上会因咀嚼力、温度变化、化学试剂或生物侵蚀而恶化。关于这些因素对树脂不同成分影响的研究结果有限。本研究的目的是评估一种替代方法，用于评估口腔对牙科材料及其各个成分的影响，并分析随时间的降解效应。将七种牙科复合材料和树脂材料植入两名受试者的上颌全口义齿中，一年后用透射电子显微镜进行评估。各种树脂成分表现出不同程度的劣化。含脲二甲基丙烯酸酯基质的复合材料较不易受影响。除聚甲基丙烯酸甲酯对照材料外，在所有材料上均发现一层唾液蛋白（薄膜）。观察到薄膜在填料颗粒以及填料与基质之间的缝隙处积聚。我们得出结论，所测试的方法对于评估材料成分与生物环境之间的相互作用是有效的。需要进一步的研究来证实这些观察结果。
