Paganini Alina, Attin Thomas, Tauböck Tobias T
Department of Orthodontics and Pediatric Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland.
Department of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland.
Materials (Basel). 2020 Aug 28;13(17):3802. doi: 10.3390/ma13173802.
This in vitro study examined the margin integrity of sculptable and flowable bulk-fill resin composites in Class II cavities of primary molars. Standardized Class II cavities were prepared in human primary molars and restored with the following resin composite materials after application of a universal adhesive: a sculptable bulk-fill composite (Tetric EvoCeram Bulk Fill (TEC) or Admira Fusion x-tra (AFX)), a flowable bulk-fill composite (Venus Bulk Fill (VBF) or SDR), or a conventional composite (Filtek Supreme XTE (FS)). The bulk-fill materials were applied in 4 mm layers, while the conventional composite was applied in either 2 mm (FS2, positive control) or 4 mm layers (FS4, negative control). The specimens were exposed to thermo-mechanical loading (TML) in a computer-controlled masticator. A quantitative margin analysis was performed both before and after TML using scanning electron microscopy, and the percentage of continuous margins (margin integrity) was statistically analyzed (α = 0.05). All composites showed a significant decline in margin integrity after TML. AFX exhibited the significantly highest margin integrity of all materials after TML (97.5 ± 2.3%), followed by FS2 (79.2 ± 10.8%), TEC (73.0 ± 9.1%), and FS4 (71.3 ± 14.6%). SDR (43.6 ± 22.3%) and VBF (25.0 ± 8.5%) revealed the lowest margin integrity. In conclusion, the tested sculptable bulk-fill materials show similar or better margin integrity in primary molars than the conventional resin composite placed in 2 mm increments.
这项体外研究检测了可雕刻型和可流动型大块充填树脂复合材料在乳磨牙Ⅱ类洞中的边缘完整性。在人类乳磨牙上制备标准化的Ⅱ类洞，在应用通用粘结剂后，用以下树脂复合材料进行修复：一种可雕刻型大块充填复合材料（Tetric EvoCeram Bulk Fill（TEC）或Admira Fusion x-tra（AFX））、一种可流动型大块充填复合材料（Venus Bulk Fill（VBF）或SDR）或一种传统复合材料（Filtek Supreme XTE（FS））。大块充填材料以4mm的厚度分层应用，而传统复合材料以2mm（FS2，阳性对照）或4mm的厚度（FS4，阴性对照）分层应用。标本在计算机控制的咀嚼模拟器中承受热机械加载（TML）。在TML前后使用扫描电子显微镜进行定量边缘分析，并对连续边缘的百分比（边缘完整性）进行统计学分析（α = 0.05）。所有复合材料在TML后边缘完整性均显著下降。TML后，AFX在所有材料中边缘完整性显著最高（97.5 ± 2.3%），其次是FS2（79.2 ± 10.8%）、TEC（73.0 ± 9.1%）和FS4（71.3 ± 14.6%）。SDR（43.6 ± 22.3%）和VBF（25.0 ± 8.5%）边缘完整性最低。总之，所测试的可雕刻型大块充填材料在乳磨牙中显示出比以2mm增量放置的传统树脂复合材料相似或更好的边缘完整性。
