*Analucia Gebler Philippi, DDS, PhD, professor, Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil.
Gabriela Panca Sabatini, DDS, PhD student, Department of Dentistry, Federal University of São Paulo, São Paulo, Brazil.
Oper Dent. 2023 Sep 1;48(5):490-499. doi: 10.2341/22-079-C.
This study aimed to compare the tooth color matching of two dental colorimetric methods: the spectrophotometric analysis (SPM) and the standardized digital photocolorimetric analysis (DPC).
The color of 60 maxillary central incisors of 30 volunteers (22.5 ± 7.6 years) was analyzed. In the DPC method, tooth photographs were standardized with the eLABor_aid protocol, processed with Adobe Photoshop Lightroom software, and the values of L*, a*, and b* were obtained with a Digital Color Meter software. For the SPM, L*, a*, and b* were measured directly with a handheld spectrophotometer. Data were submitted to paired t-test and Pearson correlation test (α=0.05). Mean color difference between the two methods was calculated with CIELAB formula.
All color coordinates revealed different values when comparing DPC to SPM in the same tooth (p<0.0001). Mean color difference (ΔEab) between SPM and DPC was 11.5 ±3.1. A positive correlation was observed for L* (R2=0.73,p<0.0001), a* (R2=0.31, p=0.017), and b* (R2=0.83, p<0.0001).
Even though the color coordinate values were different in both methods, they were correlated, revealing that the DPC is a viable alternative to determine the tooth color matching.
本研究旨在比较两种牙色比色方法：分光光度分析（SPM）和标准化数字比色分析（DPC）的牙齿颜色匹配。
分析了 30 名志愿者（22.5±7.6 岁）的 60 颗上颌中切牙的颜色。在 DPC 方法中，使用 eLABor_aid 方案对牙片进行标准化处理，使用 Adobe Photoshop Lightroom 软件进行处理，并使用 Digital Color Meter 软件获取 L*、a和 b的值。对于 SPM，使用手持分光光度计直接测量 L*、a和 b。数据采用配对 t 检验和 Pearson 相关检验（α=0.05）进行分析。用 CIELAB 公式计算两种方法之间的平均色差。
同一牙齿中 DPC 与 SPM 比较时，所有颜色坐标均显示出不同的值（p<0.0001）。SPM 和 DPC 之间的平均色差（ΔEab）为 11.5±3.1。L*（R2=0.73，p<0.0001）、a*（R2=0.31，p=0.017）和 b*（R2=0.83，p<0.0001）呈正相关。
尽管两种方法的颜色坐标值不同，但它们是相关的，这表明 DPC 是确定牙齿颜色匹配的一种可行方法。
