Theodoridis Marios, Dionysopoulos Dimitrios, Koliniotou-Koumpia Eugenia, Dionysopoulos Pavlos, Gerasimou Paris
Department of Operative Dentistry, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
J Investig Clin Dent. 2017 May;8(2). doi: 10.1111/jicd.12204. Epub 2016 Jan 9.
The aim of the present study was to evaluate the effect of preheating and shade on the surface microhardness of silorane-based composites.
Three shades of two different types of composites were evaluated: a silorane-based composite and a methacrylate-based composite. The composites were tested at 23°C, and after preheating at 55°C. Five specimens were prepared for each experimental group. The top surface of the specimens was irradiated for 20 s using an LED unit. Vickers microhardness test was used to evaluate both top and bottom surfaces of the specimens, followed by 24-h storage in the dark. Statistical analysis was performed using one-way anova and Tukey's post-hoc test at a level of significance of α = 0.05.
There was a significant rise in microhardness as the temperature increased from 23 to 55°C for both the top and bottom surfaces of the tested composites (P < 0.05). The C2 shade of both composites exhibited the lowest microhardness (P < 0.05), while the A2 and A3 shades did not show significant differences compared to each other (P > 0.05) Filtek Silorane presented significantly lower microhardness than Filtek Z250 (P < 0.05), regardless of the temperature, shade, or depth of measurement.
Preheating, shade, and composition of the tested composite resins affected their surface microhardness.
本研究旨在评估预热和色号对硅氧烷类复合材料表面显微硬度的影响。
对两种不同类型复合材料的三种色号进行评估：一种硅氧烷类复合材料和一种甲基丙烯酸酯类复合材料。复合材料在23°C下进行测试，并在55°C下预热后测试。每个实验组制备五个试样。使用LED装置对试样的顶面照射20秒。采用维氏显微硬度测试评估试样的顶面和底面，随后在黑暗中储存24小时。使用单因素方差分析和Tukey事后检验进行统计分析，显著性水平α = 0.05。
对于测试复合材料的顶面和底面，随着温度从23°C升高到55°C，显微硬度均显著升高（P < 0.05）。两种复合材料的C2色号显示出最低的显微硬度（P < 0.05），而A2和A3色号之间相比未显示出显著差异（P > 0.05）。无论温度、色号或测量深度如何，Filtek Silorane的显微硬度均显著低于Filtek Z250（P < 0.05）。
测试复合树脂的预热、色号和组成会影响其表面显微硬度。
