Cattani-Lorente M A, Dupuis V, Moya F, Payan J, Meyer J M
Division of Dental Materials, School of Dentistry, University of Geneva, Switzerland.
Dent Mater. 1999 Jan;15(1):21-32. doi: 10.1016/s0109-5641(99)00010-x.
The physical properties of the resin-modified composite resin Dyract (Detrey Dentsply) and the resin-modified glass ionomer cement Fuji II LC (GC) were compared, and the effect of water sorption on these properties was studied.
Compressive, diametral compressive and flexural strengths were measured using specimens aged up to three months. The Vickers hardness and the water erosion were also determined. The specimens were stored at 37 degrees C under five different conditions, chosen to vary the water sorption of the samples. The results were analyzed using a multi-factor analysis of variance.
Dry specimens of Dyract and Fuji II LC showed similar properties. However, the two materials behaved differently when stored in presence of water. In contrast to Fuji II LC, Dyract showed very little expansion for the first 24 h (1.5 +/- 0.3 and 0.03 +/- 0.01%, respectively), leached small quantities of ions and retained its mechanical strength. Those differences are related to their chemical composition. Fuji II LC is hydrophilic, as it contains polyHEMA. In the presence of water, Fuji II LC behaves like a hydrogel, but the network resulting from the copolymerization of acidic and UDMA monomers is less hydrophilic, and the effect of water on Dyract is retarded.
The significant properties of Dyract are determined by its composite character. This certainly represents some advantages, for instance, a higher mechanical strength, a better protection against initial dehydration and subsequent water effects. However, Dyract shows some disadvantages over Fuji II LC, like a lower amount of fluoride release or the interference of oxygen during polymerization.
比较树脂改性复合树脂Dyract（德瑞·登士柏）和树脂改性玻璃离子水门汀Fuji II LC（GC）的物理性能，并研究吸水对这些性能的影响。
使用老化长达三个月的试件测量其抗压强度、径向抗压强度和弯曲强度。还测定了维氏硬度和水侵蚀情况。将试件在37摄氏度下于五种不同条件下储存，以改变样品的吸水量。使用多因素方差分析对结果进行分析。
Dyract和Fuji II LC的干燥试件表现出相似的性能。然而，当在有水的情况下储存时，这两种材料的表现有所不同。与Fuji II LC相比，Dyract在最初24小时内膨胀非常小（分别为1.5±0.3%和0.03±0.01%），浸出少量离子并保持其机械强度。这些差异与它们的化学成分有关。Fuji II LC具有亲水性，因为它含有聚甲基丙烯酸羟乙酯。在有水的情况下，Fuji II LC表现得像一种水凝胶，但酸性单体和UDMA单体共聚形成的网络亲水性较差，水对Dyract的影响会延迟。
Dyract的显著性能由其复合材料特性决定。这当然代表了一些优势，例如，更高的机械强度、更好地防止初始脱水和后续水的影响。然而，Dyract相对于Fuji II LC也存在一些缺点，如较低的氟释放量或聚合过程中氧气的干扰。
