Background/purpose The aim of this study was to investigate the slumping resistance during modeling of four light-initiated composite materials before their polymerization. Materials and methods Filtek Supreme XT (3M-ESPE, Seefeld, Germany), Enamel Plus HFO (GDF, Germany), Tetric EvoCeram (Vivadent, Liechtenstein), and Synergy D6 (Coltene, Whaledent AG, Switzerland) were used to measure the shape deformation (i.e., slumping). Three different molar shapes of composites were obtained from customized silicon molds. The surface of each sample was digitized with a 3D laser scanner (400 slices, with a lateral resolution of 25?μm) every minute up to the first 4 minutes. The 3D datasets at each point in time were numerically superimposed with matching software. Differences in deformation were calculated relative to the baseline measurement. Results We found the lowest surface change for Synergy D6 with tooth molds 1 and 2 (21–37?μm) and Tetric EvoCeram with tooth mold 3 (29–37?μm). Enamel Plus HFO had the largest surface change of all tooth molds and all observed time intervals. Significant differences (P?
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机译：背景/目的本研究的目的是研究四种光引发的复合材料在聚合之前的建模过程中的耐塌陷性。材料和方法使用Filtek Supreme XT（3M-ESPE，德国Seefeld），Enamel Plus HFO（德国GDF），Tetric EvoCeram（列支敦士登Vivadent）和Synergy D6（Coltene，Whaledent AG，瑞士）来测量形状。变形（即塌落）。从定制的硅模具中获得了三种不同的摩尔形状的复合材料。直到最初的4分钟，每分钟用3D激光扫描仪（400片，横向分辨率为25？μm）将其表面数字化。将每个时间点的3D数据集与匹配软件进行数值叠加。相对于基准测量值计算了变形差异。结果我们发现使用牙齿模具1和2的Synergy D6（21-37？μm）和使用牙齿模具3的Tetric EvoCeram的表面变化最低（29-37？μm）。在所有牙齿模具和所有观察到的时间间隔内，Enamel Plus HFO的表面变化最大。在所有测试的复合材料中确定了材料类型因子的显着差异（P≤0.05）。 Synergy D6和Tetric EvoCeram与牙模1没有明显差异。结论使用此方法，可以识别不同复合材料的处理特性。这项研究的结果可以量化坍落度差异，并帮助选择适合其预期用途的材料。
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