Ozcan Suat, Yikilgan Ihsan, Uctasli Mine Betul, Bala Oya, Bek Kurklu Zeliha Gonca
Department of Restorative Dentistry, Faculty of Dentistry, University of Gazi, Ankara, Turkiye.
Public Dentist, Adana, Turkiye.
Eur J Dent. 2013 Sep;7(Suppl 1):S020-S025. doi: 10.4103/1305-7456.119059.
The aim of this study was to evaluate the change in surface hardness of silorane-based composite resin (Filtek Silorane) in time and compare the results with the surface hardness of two methacrylate-based resins (Filtek Supreme and Majesty Posterior).
From each composite material, 18 wheel-shaped samples (5-mm diameter and 2-mm depth) were prepared. Top and bottom surface hardness of these samples was measured using a Vicker's hardness tester. The samples were then stored at 37°C and 100% humidity. After 24 h and 7, 30 and 90 days, the top and bottom surface hardness of the samples was measured. In each measurement, the rate between the hardness of the top and bottom surfaces were recorded as the hardness rate. Statistical analysis was performed by one-way analysis of variance, multiple comparisons by Tukey's test and binary comparisons by t-test with a significance level of P = 0.05.
The highest hardness values were obtained from each two surfaces of Majesty Posterior and the lowest from Filtek Silorane. Both the top and bottom surface hardness of the methacrylate based composite resins was high and there was a statistically significant difference between the top and bottom hardness values of only the silorane-based composite, Filtek Silorane (P < 0.05). The lowest was obtained with Filtek Silorane. The hardness values of all test groups increased after 24 h (P < 0.05).
Although silorane-based composite resin Filtek Silorane showed adequate hardness ratio, the use of incremental technic during application is more important than methacrylate based composites.
本研究旨在评估基于硅氧烷的复合树脂（Filtek Silorane）表面硬度随时间的变化，并将结果与两种基于甲基丙烯酸酯的树脂（Filtek Supreme和Majesty Posterior）的表面硬度进行比较。
从每种复合材料制备18个轮状样品（直径5毫米，深度2毫米）。使用维氏硬度计测量这些样品的顶面和底面硬度。然后将样品储存在37°C和100%湿度环境中。在24小时、7天、30天和90天后，测量样品的顶面和底面硬度。每次测量时，记录顶面和底面硬度之间的比率作为硬度率。采用单因素方差分析进行统计分析，通过Tukey检验进行多重比较，通过t检验进行二元比较，显著性水平为P = 0.05。
Majesty Posterior的两个表面获得的硬度值最高，而Filtek Silorane的硬度值最低。基于甲基丙烯酸酯的复合树脂的顶面和底面硬度都很高，只有基于硅氧烷的复合树脂Filtek Silorane的顶面和底面硬度值之间存在统计学显著差异（P < 0.05）。Filtek Silorane的硬度值最低。所有测试组的硬度值在24小时后均有所增加（P < 0.05）。
尽管基于硅氧烷的复合树脂Filtek Silorane显示出足够的硬度比，但在应用过程中使用分层技术比基于甲基丙烯酸酯的复合材料更为重要。
