%0 Journal Article
%T Effect of the thicknesses of bulk-fill composites on bonding strength.
%A Wang Y
%A Yang J
%A Xie H
%A Chen C
%J Hua Xi Kou Qiang Yi Xue Za Zhi
%V 40
%N 2
%D 2022 Mar 25
%M 38597049
暂无%R 10.7518/hxkq.2022.02.007
%X <B>OBJECTIVE: </B>This work evaluated the effects of thickness on resin bonding strength.<BR><B>METHODS: </B>We set the two bulk-fill composites Filtek Bulk Fill Posterior (FBF) and Tetric N-Ceram Bulk Fill (TBF) as the experimental groups and the two conventional composites Filtek Z100 (Z100) and Spectrum TPH (ST) as the control groups. The translucency parameter (TP), color difference, Vickers hardness (HV), and microtensile bond strength (μTBS) of dentine and the resin composites were measured at different depths.<BR><B>RESULTS: </B>In each group, TP and HV decreased with the increase in thickness. At the same depth, the TP of the bulk-fill composites was higher than that of the conventional composites. At the same depth, the HV of the four different resin composites followed the order of Z100>FBF>TBF>ST (except for the upper surface). Except for FBF at 3 and 4 mm, all of the other groups showed no visible color change at all the tested thicknesses. Although the μTBS values of the four different composites obtained through the bulk-fill technique were lower than those of composites obtained through the incremental fill technique, the μTBS of the bulk-fill composites obtained through the bulk-filling technique can reach 30 MPa.<BR><B>CONCLUSIONS: </B>Bulk-fill composites applied in single 4 mm increments can meet the requirements of clinical application. However, the color stability of some bulk-fill composites cannot be maintained.<BR>目的: 研究充填厚度对大块复合树脂充填效果的影响。方法: 2种大块充填树脂Filtek Bulk Fill Posterior（FBF）和Tetric N-Ceram Bulk Fill（TBF）为实验组，2种传统光固化复合树脂Filtek Z100（Z100）和 Spectrum TPH（ST）为对照，测试不同固化厚度下树脂的透明度、颜色稳定性、表面维氏硬度和微拉伸粘接强度。结果: 4种树脂透明度、硬度随厚度增加而降低。同一厚度下，大块树脂透明度高于传统树脂，硬度为Z100>FBF>TBF>ST（上表面硬度除外）。除FBF 3 mm和4 mm组老化后颜色参数发生显著变化外，其他各组均未发生明显变化。4种树脂一次性充填4 mm的微拉伸粘接强度均较分层充填低，但大块充填树脂一次性充填4 mm的微拉伸粘接强度仍可达到30 MPa。结论: 大块充填树脂采用一次充填技术能满足临床要求，但个别品牌可能出现远期颜色不稳定。.