Truong Thuyvi Amy, Luu Thu, Avillo Andrew, Adcook Richard, Hamlin Nicholas
Gen Dent. 2023 Sep-Oct;71(5):38-44.
Demand for direct esthetic restorations is high, but shade matching can be challenging. Some manufacturers claim that a single product is able to match all colors of the human dentition, eliminating shade matching challenges. This in vivo study, which followed the International Commission on Illumination's (CIE) CIEDE2000 color difference standard (ΔE), aimed to quantify the shade matching and blending capabilities of a single-shade composite (Omnichroma PLT) used as a direct veneer. A color difference of ΔE ≤ 1.8 was set as the acceptability threshold. Ten participants with an unrestored and noncarious maxillary left central incisor were enrolled in the study. Direct spectrophotometric measurements (CIE Lab*) were made on the tooth and then on composite cured on the tooth. Consistency in measurements and composite resin placement were attained through the use of a specially designed jig. A digital photograph was then taken with the composite in place, and colorimetric software was used to obtain the Lab* values at the most incisal and cervical edges of the restoration. These values were compared to those of the natural tooth structure immediately adjacent to the composite resin. The ΔE scores were calculated to determine the composite's ability to match the tooth shade beneath it (ΔE) and to blend with the incisal (ΔE) and cervical (ΔE) tooth shades. Mean scores for ΔE, ΔE, and ΔE were calculated, and an independent t test (α = 0.05) was used to compare means for ΔE and ΔE. The mean (SD) ΔE values were 6.16 (2.38), 3.90 (2.47), and 6.84 (1.80) for ΔE, ΔE, and ΔE, respectively. A statistically significant difference (P = 0.008) was observed between ΔE and ΔE. As a direct veneer, the tested composite did not meet the acceptability threshold for any ΔE measurement; however, it was better at matching the incisal third of the tooth than it was the other thirds. More in vivo studies are needed to verify and expand on these results.
对直接美学修复体的需求很高，但比色可能具有挑战性。一些制造商声称，单一产品能够匹配人类牙列的所有颜色，消除比色挑战。这项体内研究遵循国际照明委员会（CIE）的CIEDE2000色差标准（ΔE），旨在量化用作直接贴面的单色调复合材料（Omnichroma PLT）的比色和融合能力。将ΔE≤1.8的色差设定为可接受阈值。十名上颌左中切牙未修复且无龋的参与者被纳入该研究。先对牙齿进行直接分光光度测量（CIE Lab*），然后对固化在牙齿上的复合材料进行测量。通过使用专门设计的夹具来实现测量和复合树脂放置的一致性。然后在复合材料就位的情况下拍摄数码照片，并使用比色软件在修复体的最切端和颈部边缘获取Lab*值。将这些值与紧邻复合树脂的天然牙结构的值进行比较。计算ΔE分数以确定复合材料匹配其下方牙齿颜色（ΔE）以及与切端（ΔE）和颈部（ΔE）牙齿颜色融合的能力。计算ΔE、ΔE和ΔE的平均分数，并使用独立t检验（α = 0.05）比较ΔE和ΔE的平均值。ΔE、ΔE和ΔE的平均（标准差）ΔE值分别为6.16（2.38）、3.90（2.47）和6.84（1.80）。观察到ΔE和ΔE之间存在统计学显著差异（P = 0.008）。作为直接贴面，测试的复合材料在任何ΔE测量中均未达到可接受阈值；然而，它在匹配牙齿切端三分之一处比其他三分之一处表现更好。需要更多的体内研究来验证和扩展这些结果。
