Cadenaro Milena, Marchesi Giulio, Antoniolli Francesca, Davidson Carel, De Stefano Dorigo Elettra, Breschi Lorenzo
Department of Biomedicine, Unit of Dental Sciences and Biomaterials, University of Trieste, Via Stuparich, 1, I-34125 Trieste, Italy.
Dent Mater. 2009 May;25(5):649-54. doi: 10.1016/j.dental.2008.11.010. Epub 2009 Jan 10.
The purpose of this study was to measure the contraction stress development of three flowable resin-composite materials (Grandio Flow, VOCO GmbH, Cuxhaven, Germany; Tetric Flow, Ivoclar Vivadent, Schaan, Liechtenstein; Filtek Supreme XT Flowable Restorative, 3M ESPE, ST. Paul, MN, USA) and an universal micro-hybrid composite resin (Filtek Z250, 3M ESPE, St. Paul, MN, USA) during photopolymerization with a halogen curing light, using a novel stress-measuring gauge.
Curing shrinkage stress was measured using a stress-analyzer. Composites were polymerized with a halogen curing unit (VIP, Bisco Inc., Schaumburg, IL, USA) for 40s. The contraction force (N) generated during polymerization was continuously recorded for 180s after photo-initiation. Contraction stress (MPa) was calculated at 20s, 40s, 60s, 120s and 180s. Data were statistically analyzed.
Filtek Supreme XT Flowable Restorative exhibited the highest stress values compared to other materials (p<0.05), while the lowest values were recorded with Tetric Flow (p<0.05). Tetric Flow was also the only flowable composite showing stress values lower than the conventional composite Filtek Z250 (p<0.05).
Flowable composites investigated with this experimental setup showed shrinkage stress comparable to conventional resin restorative materials, thus supporting the hypothesis that the use of flowable materials do not lead to marked stress reduction and the risk of debonding at the adhesive interface as a result of polymerization contraction is similar for both type of materials.
本研究旨在使用一种新型应力测量仪，测量三种可流动树脂复合材料（德国库克斯港VOCO GmbH公司的Grandio Flow；列支敦士登沙恩Ivoclar Vivadent公司的Tetric Flow；美国明尼苏达州圣保罗3M ESPE公司的Filtek Supreme XT Flowable Restorative）和一种通用微混合复合树脂（美国明尼苏达州圣保罗3M ESPE公司的Filtek Z250）在使用卤素固化灯进行光聚合过程中的收缩应力发展情况。
使用应力分析仪测量固化收缩应力。复合材料使用卤素固化装置（美国伊利诺伊州绍姆堡Bisco Inc.公司的VIP）聚合40秒。光引发后180秒内连续记录聚合过程中产生的收缩力（N）。在20秒、40秒、60秒、120秒和180秒时计算收缩应力（MPa）。对数据进行统计学分析。
与其他材料相比，Filtek Supreme XT Flowable Restorative表现出最高的应力值（p<0.05），而Tetric Flow记录的应力值最低（p<0.05）。Tetric Flow也是唯一一种应力值低于传统复合材料Filtek Z250的可流动复合材料（p<0.05）。
使用该实验装置研究的可流动复合材料显示出与传统树脂修复材料相当的收缩应力，从而支持了以下假设：使用可流动材料不会导致明显的应力降低，并且两种材料因聚合收缩在粘结界面处脱粘的风险相似。
