Kurtulmus-Yilmaz Sevcan, Cengiz Esra, Ulusoy Nuran, Ozak Sule Tugba, Yuksel Ece
Department of Prosthodontics, Faculty of Dentistry, Near East University, Mersin10, Turkey.
J Dent. 2013 Nov;41 Suppl 5:e70-5. doi: 10.1016/j.jdent.2012.12.007. Epub 2013 Jan 9.
The aim of this study was to investigate the effect of home bleaching agents on the color and translucency of resin composites.
Thirty disc shaped specimens (1mm thick) were fabricated from each resin composite (Reflexions, Grandio, Gradia Direct, Clearfil Majesty Esthetic, Ceram-X Mono) and divided into 3 subgroups as carbamide peroxide (CP, Opalescence 10% PF), hydrogen peroxide (HP, 10% Opalescence Treswhite Supreme) and control group (n=10). Baseline CIE Lab* color coordinates were measured with spectrophotometer and translucency parameters (TP) were calculated. CP and HP groups were treated with bleaching agents according to manufacturers' instructions and control group was stored in distilled water (DW) for 14 days. Color and translucency measurements were repeated and color differences were calculated, ΔE values>3.3 were considered as clinically unacceptable.
Clinically unacceptable color change was detected for all resin composites exposed to bleaching agents and there was significant color difference between the control group and bleached specimens (P<0.05). However no significant color difference was found between CP and HP groups. Intragroup comparison revealed that Ceram-X Mono showed the highest color change but there was no significant difference among the other tested materials for both CP and HP groups. Intergroup comparison of TP values of CP, HP and control groups at the end of 14th day revealed that there was no statistical significant translucency difference among the groups.
Application of CP and HP resulted in clinically unacceptable color change for all resin composites. Translucencies of the resin composites were not affected by bleaching procedure.
The results of this in vitro study suggest that patients should be informed regarding a potential color change of existing resin composite restorations with the use of home bleaching agents.
本研究旨在探讨家庭漂白剂对树脂复合材料颜色和透明度的影响。
从每种树脂复合材料（Reflexions、Grandio、Gradia Direct、Clearfil Majesty Esthetic、Ceram-X Mono）制备30个圆盘形试件（1毫米厚），并分为3个亚组：过氧化脲（CP，Opalescence 10% PF）、过氧化氢（HP，10% Opalescence Treswhite Supreme）和对照组（n = 10）。用分光光度计测量基线CIE Lab*颜色坐标，并计算透明度参数（TP）。CP组和HP组按照制造商的说明用漂白剂处理，对照组在蒸馏水中保存14天。重复进行颜色和透明度测量并计算颜色差异，ΔE值>3.3被认为在临床上不可接受。
所有暴露于漂白剂的树脂复合材料均检测到临床上不可接受的颜色变化，对照组与漂白试件之间存在显著颜色差异（P<0.05）。然而，CP组和HP组之间未发现显著颜色差异。组内比较显示，Ceram-X Mono的颜色变化最大，但CP组和HP组的其他测试材料之间没有显著差异。第14天结束时CP、HP和对照组TP值的组间比较显示，各组之间的透明度没有统计学显著差异。
CP和HP的应用导致所有树脂复合材料出现临床上不可接受的颜色变化。树脂复合材料的透明度不受漂白程序的影响。
这项体外研究的结果表明，应告知患者使用家庭漂白剂可能会使现有的树脂复合材料修复体发生颜色变化。
