Mohammadipour Hamideh Sadat, Yazdi Soroush Sarafraz, Mashhad Mohammad Javad Moghaddas, Babazadeh Saber, Shahri Arsalan
Dental Materials Research Center, Department of Restorative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
BMC Oral Health. 2025 Apr 22;25(1):616. doi: 10.1186/s12903-025-05975-7.
Achieving a seamless color match in resin composite restorations remains a significant clinical challenge due to variations in tooth structure and background shades. The aim of this in vitro study was to assess the effect of background shade, thermal aging, and composite thickness on color matching and translucency of three single-shade resin composites.
A total of 72 resin composite disks (12 mm diameter) were fabricated using three single-shade composites -Omnichroma (OMN), Charisma Diamond ONE (CDO), and Charisma Topaz ONE (CTO)- in two thicknesses (1.5 and 3 mm), resulting in six groups (n = 12 per group). Subsequently, three background disks were prepared from Estelite Sigma Quick in shades A1, A3, and B1, and the 72 composite disks were positioned on these background disks to form a two-layer assembly for evaluation. The L*, a*, and b* variables before and after thermocycling (10,000 cycles) were recorded and blending effect (BE) was calculated. The translucency was evaluated by using white and black backgrounds. The data were analyzed by Kolmogorov-Smirnov, ANOVA, Independent Samples T-test, and Tukey HSD tests with the significance level set at 5%.
OMN exhibited a significantly superior BE compared to CTO and CDO, both before and after aging (p < 0.001). Color matching was significantly better at 1.5 mm than at 3 mm, except for CTO and CDO on the A3 background (p = 0.193 and p = 0.550, respectively). BE was highest on the A1 background, intermediate on B1, and lowest on A3 (p < 0.001). Translucency was significantly higher at 1.5 mm than at 3 mm (p < 0.001), except for CTO on A3 after aging (p = 0.198), while background shade did not affect translucency (p > 0.05).
The BE of single-shade resin composite is material and thickness-dependent. Overall, OMN demonstrated superior shade matching across different backgrounds compared to CDO and CTO, at both thicknesses, before and after aging.
Understanding the influence of composite material, thickness, and underlying shade can optimize color matching in dental restorations, improving clinical outcomes and esthetics.
由于牙齿结构和底色的差异，在树脂复合材料修复中实现无缝颜色匹配仍然是一项重大的临床挑战。本体外研究的目的是评估底色、热老化和复合材料厚度对三种单色调树脂复合材料颜色匹配和透明度的影响。
使用三种单色调复合材料——全彩（OMN）、魅力钻石一号（CDO）和魅力黄玉一号（CTO）——制作了总共72个树脂复合材料圆盘（直径12毫米），有两种厚度（1.5毫米和3毫米），形成六组（每组n = 12）。随后，用Estelite Sigma Quick制作了三种底色圆盘，颜色分别为A1、A3和B1，并将72个复合材料圆盘放置在这些底色圆盘上，形成两层组件进行评估。记录热循环（10,000次循环）前后的L*、a和b变量，并计算混合效果（BE）。通过使用白色和黑色背景评估透明度。数据采用Kolmogorov-Smirnov检验、方差分析、独立样本t检验和Tukey HSD检验进行分析，显著性水平设定为5%。
在老化前后，OMN的BE均显著优于CTO和CDO（p < 0.001）。除了在A3底色上的CTO和CDO外（分别为p = 0.193和p = 0.550），1.5毫米时的颜色匹配明显优于3毫米时（p < 0.001）。BE在A1底色上最高，在B1底色上居中，在A3底色上最低（p < 0.001）。除了老化后A3底色上的CTO外（p = 0.198），1.5毫米时的透明度显著高于3毫米时（p < 0.001），而底色对透明度没有影响（p > 0.05）。
单色调树脂复合材料的BE取决于材料和厚度。总体而言，在老化前后，在两种厚度下，与CDO和CTO相比，OMN在不同底色上均表现出更好的颜色匹配。
了解复合材料、厚度和底层底色的影响可以优化牙齿修复中的颜色匹配，改善临床效果和美观度。
