Cinelli Francesca, Scaminaci Russo Daniele, Nieri Michele, Giachetti Luca
Unit of Dentistry, Department of Experimental and Clinical Medicine, University of Florence, Via del Ponte di Mezzo, 48-50127 Firenze, Italy.
Materials (Basel). 2022 Jul 13;15(14):4874. doi: 10.3390/ma15144874.
Composite resins are considered the material of choice for esthetic direct restorations, considering both their satisfying esthetic and mechanical properties. The success of composite resin restorations depends highly on their color stability. Discoloration causes color mismatch, consequent patient dissatisfaction, and eventually additional costs for correction/replacement of the restoration. The purpose of this study was to evaluate the degree of pigment penetration within the composite resins, in order to understand how discoloration can be treated properly. Two different commercially available composite resins were compared in the study: a nano-filled composite resin and a non-homogeneous micro-hybrid composite resin. A coffee solution was used to induce staining of the materials. Subsequently, the penetration of the pigments was measured by analyzing the color from the outside to the inside of the specimen. 14 levels were analyzed starting from 0.1 mm to 3.0 mm in depth. The ANOVA test demonstrated a statistically significant difference (p < 0.0001) between test and control groups up to a depth of 1.0 mm for the nano-filled composite and up to a depth of 2.0 mm for the non-homogeneous micro-hybrid composite. The two composite resin materials, subjected to pigmenting treatment, underwent a color variation with different patterns.
考虑到复合树脂令人满意的美学和机械性能，它们被认为是美观直接修复的首选材料。复合树脂修复体的成功高度依赖于其颜色稳定性。变色会导致颜色不匹配，进而引起患者不满，并最终导致修复体矫正/更换的额外费用。本研究的目的是评估复合树脂内部色素渗透的程度，以便了解如何正确处理变色问题。在该研究中比较了两种不同的市售复合树脂：一种纳米填充复合树脂和一种非均质微混合复合树脂。使用咖啡溶液对材料进行染色。随后，通过分析标本从外到内的颜色来测量色素的渗透情况。从深度0.1毫米到3.0毫米分析了14个层面。方差分析测试表明，对于纳米填充复合树脂，在深度达1.0毫米时，测试组和对照组之间存在统计学显著差异（p < 0.0001）；对于非均质微混合复合树脂，在深度达2.0毫米时存在统计学显著差异。经过色素处理的两种复合树脂材料呈现出不同模式的颜色变化。
