Saikaew Pipop, Phimolthares Patchara, Phitakthanaakul Pheeratas, Sirikul Panthira, Mekrakseree Suwannee, Panpisut Piyaphong
Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand.
Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand.
Polymers (Basel). 2021 Nov 11;13(22):3902. doi: 10.3390/polym13223902.
Color modifiers can be mixed with resin composites to mimic the shade of severely discolored tooth. The aim of this study was to assess the effects of a color modifier on the physical and mechanical properties of a resin composite. The composite was mixed with a color modifier at 0 wt% (group 1), 1 wt% (group 2), 2.5 wt% (group 3), or 5 wt% (group 4). The degree of monomer conversion (DC) was examined after light curing for 20 or 40 s. Biaxial flexural strength (BFS)/modulus (BFM), surface microhardness (SH), and water sorption (W)/solubility (W) were also tested. The DC of group 1 was significantly higher than that of groups 3 and 4. The increase in curing time from 20 to 40 s increased the DC by ~10%. The BFS, BFM, W, and W of all the groups were comparable. A negative correlation was detected between the concentration of color modifier and the BFS and DC, while a positive correlation was observed with W. In conclusion, the color modifier reduced the DC of composites, but the conversion was improved by extending the curing time. The increase in color modifier concentration also correlated with a reduction in strength and the increase in the water sorption of the composites.
颜色调节剂可与树脂复合材料混合，以模拟严重变色牙齿的色泽。本研究的目的是评估一种颜色调节剂对树脂复合材料物理和机械性能的影响。将复合材料与0 wt%（第1组）、1 wt%（第2组）、2.5 wt%（第3组）或5 wt%（第4组）的颜色调节剂混合。在光固化20秒或40秒后检测单体转化率（DC）。还测试了双轴弯曲强度（BFS）/模量（BFM）、表面显微硬度（SH）以及吸水率（W）/溶解度（W）。第1组的DC显著高于第3组和第4组。固化时间从20秒增加到40秒使DC提高了约10%。所有组的BFS、BFM、W和W相当。检测到颜色调节剂浓度与BFS和DC之间呈负相关，而与W呈正相关。总之，颜色调节剂降低了复合材料的DC，但通过延长固化时间提高了转化率。颜色调节剂浓度的增加还与复合材料强度的降低以及吸水率的增加相关。
