Giachetti Luca, Scaminaci Russo Daniele, Nieri Michele, Cinelli Francesca
Department of Experimental and Clinical Medicine, Unit of Dentistry, University of Florence, Florence, Italy.
Restor Dent Endod. 2024 Jun 11;49(3):e23. doi: 10.5395/rde.2024.49.e23. eCollection 2024 Aug.
Previous studies determined the whitening effects of bleaching products on stained resin composite surfaces. This study aimed to verify the effectiveness of a whitening system on composite resin previously subjected to pigmentation, specifically examining the depth of whitening effectiveness within the material structure.
A commercially available nano-filled composite resin was used. Specimens were stained using a coffee-based solution and a 10% carbamide peroxide-based gel was employed as the whitening agent. The pigment's penetration and the effect of the bleaching gel were evaluated by measuring color (CieLab values) from the outer edge to the inner part of the specimens. Color measurements were taken at 14 points, starting from 0.1 mm from the external perimeter up to 3.0 mm.
Analysis of variance tests showed a statistically significant difference between the Control Group (CG), Pigmentation Group, and Whitening Group. The whitening agent was effective up to 1.5 mm in depth, with Whiteness index (W) values not statistically different from those of CG up to 0.5 mm in depth.
Whitening agents on nano-filled resin composite previously pigmented appear effective in restoring the W to values similar to the original, particularly in the superficial layers of the sample.
以往研究确定了漂白产品对染色树脂复合材料表面的美白效果。本研究旨在验证一种美白系统对先前已着色的复合树脂的有效性，具体研究材料结构内美白效果的深度。
使用市售的纳米填充复合树脂。样本用咖啡基溶液染色，并使用基于10%过氧化脲的凝胶作为美白剂。通过测量样本从外边缘到内部的颜色（CIELAB值）来评估色素的渗透和漂白凝胶的效果。从距离外周0.1毫米到3.0毫米处的14个点进行颜色测量。
方差分析显示对照组（CG）、色素沉着组和美白组之间存在统计学上的显著差异。美白剂在深度达1.5毫米时有效，在深度达0.5毫米时白度指数（W）值与对照组无统计学差异。
对于先前已着色的纳米填充树脂复合材料，美白剂似乎能有效地将白度恢复到与原始值相似的值，特别是在样本的表层。
