Kumar Naresh, Sangi Laila
Science of Dental Materials Department, Institute of Dentistry, Liaquat University of Medical and Health Sciences, Jamshoro, Pakistan.
J Investig Clin Dent. 2014 May;5(2):144-50. doi: 10.1111/jicd.12012. Epub 2012 Nov 27.
To determine the water sorption, solubility, and resultant change in strength of one microhybrid and two nanofilled resin-based composites (RBCs).
Water sorption, solubility, and three-point bending strength (TPBS) characteristics of a microhybrid RBC Filtek(™) Z250 (Z250; batch 8MA; shade A3) and two nanofilled RBCs, namely Filtek(™) Supreme XT "body" (FSB; batch 8NU; shade A3) and "translucent" shades (FST; batch 6C; shade YT) (3M ESPE Dental Products, St Paul, MN, USA) were investigated following 1 and 13 weeks storage regimes.
FSB displayed a significant increase in water sorption compared with Z250 and FST (P < 0.001), however, the latter demonstrated no significant difference between them following 1 week and 13 weeks immersion periods (P > 0.001). Following the 13-week immersion period, FSB showed greater water solubility compared with Z250 and FST (P < 0.001). FSB exhibited greater TPBS compared with FST in dry control specimens (P < 0.05), but no significant difference among TPBS of all RBCs was identified following the 1-week immersion period (P = 0.290). The TPBS of FSB decreased significantly compared with Z250 and FST following the 13-week immersion period (P < 0.001).
Since the FSB exhibited greater water sorption, solubility, and resulting strength degradation compared with Z250 and FST, a poor clinical performance may be expected.
测定一种微混合树脂基复合材料和两种纳米复合树脂基复合材料（RBCs）的吸水性、溶解性及由此导致的强度变化。
研究了微混合RBC Filtek(™) Z250（Z250；批号8MA；色号A3）以及两种纳米复合RBCs，即Filtek(™) Supreme XT“主体”（FSB；批号8NU；色号A3）和“半透明”色号（FST；批号6C；色号YT）（美国明尼苏达州圣保罗3M ESPE牙科产品公司）在1周和13周储存期后的吸水性、溶解性及三点弯曲强度（TPBS）特性。
与Z250和FST相比，FSB的吸水性显著增加（P < 0.001），然而，在浸泡1周和13周后，Z250和FST之间无显著差异（P > 0.001）。在浸泡13周后，FSB的水溶性比Z250和FST更高（P < 0.001）。在干燥对照样本中，FSB的TPBS比FST更高（P < 0.05），但在浸泡1周后，所有RBCs的TPBS之间无显著差异（P = 0.290）。在浸泡13周后，FSB的TPBS与Z250和FST相比显著降低（P < 0.001）。
由于FSB与Z250和FST相比表现出更高的吸水性、溶解性及由此导致的强度降解，因此其临床性能可能较差。
