Polymerization Shrinkage Stresses of Different Flowable and Universal Bulk-Fill Composites

Marlen Robles-Moreno
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引用次数: 1

Abstract

Objective: To analyze and compare the shrinkage stress properties of flowable and universal bulk-fill resin composites over five minutes after photopolymerization. Materials and Methods: Eleven resin composites, seven flowable and four universals, were tested (n=5). Two glass cylinders were affixed end-to-end in a vertical position on an INSTRON universal testing machine, leaving a 1mm gap between them. Each resin was injected until filling the gap and photopolymerized for 20s. The force curve was recorded over 5 minutes after photopolymerization. The stress values were calculated in MPa at 20s, 60s, 180s, and 300s. Statistical analysis using ANOVA and All-Pairs Tukey-Kramer Test (JMP Pro 12.0. SAS, Cary, NC) were done to compare the polymerization shrinkage stresses among the groups at α = 0.05. Results: All the resins showed a continuous increase in shrinkage stress up to the 300 seconds, following photopolymerization. Three flowable composites Dentex, G¬aenial Universal, and Prime-Dent Flow, obtained the highest shrinkage stresses, while another flowable resin SureFil SDR demonstrated the lowest shrinkage stress from all the materials tested. In general, universal composites demonstrated lower shrinkage stress values than the flowable composites. Conclusions: In general, flowable resin composites presented higher shrinkage stresses compared to universal composites. Clinical Bulk-fill resin composites are widely used clinically, yet little information regarding the polymerization shrinkage stresses produced by these materials is available.
不同可流动和通用体填充复合材料的聚合收缩应力
目的:分析比较可流动和通用填充型树脂复合材料光聚合后5分钟内的收缩应力特性。材料与方法:11种树脂复合材料,7种为流动型,4种为通用型(n=5)。将两个玻璃钢瓶端对端垂直固定在INSTRON万能试验机上,两者之间留有1mm的间隙。每一种树脂注入,直到填补间隙,光聚合20s。记录光聚合后5分钟的力曲线。在20s、60s、180s和300s时,以MPa为单位计算应力值。统计分析采用方差分析和全对Tukey-Kramer检验(JMP Pro 12.0)。SAS, Cary, NC)比较各组间聚合收缩应力,α = 0.05。结果:所有树脂在光聚合后的300秒内收缩应力持续增加。三种可流动复合材料Dentex、G - enial Universal和Prime-Dent Flow获得了最高的收缩应力,而另一种可流动树脂SureFil SDR在所有测试材料中显示出最低的收缩应力。一般来说,通用复合材料的收缩应力值比流动复合材料低。结论:与通用复合材料相比,可流动树脂复合材料具有更高的收缩应力。临床大块填充树脂复合材料在临床上被广泛使用,但关于这些材料产生的聚合收缩应力的信息很少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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