视觉与电子牙齿颜色测量的实验研究

Ratzmann Anja, Treichel Anja, Langforth Gabriele, Gedrange Tomasz, Welk Alexander

Department of Orthodontics, EMA University of Greifswald, Germany.

Biomed Tech (Berl). 2011 Apr;56(2):115-22. doi: 10.1515/BMT.2011.008. Epub 2011 Mar 31.

OBJECTIVE

The present study aimed to examine the validity of the visual color assessment and an electronic tooth color measurement system by means of Shade Inspector™ in comparison with a gold standard. Additionally, reproducibility of electronic measurements was demonstrated by means of two reference systems.

MATERIAL AND METHODS

Ceramic specimens of two thicknesses (h=1.6 mm, h=2.6 mm) were used. Three experienced dental technicians using the VITAPAN Classical(®) color scale carried out all visual tests. Validity of the visual assessment and the electronic measurements was confirmed separately for both thicknesses by means of lightness and hue of the VITAPAN Classical(®) color scale. Reproducibility of electronic measurements was confirmed by means of the VITAPAN Classical(®) and 3D-Master(®). The 3D-Master(®) data were calculated according to lightness, hue and chroma. Intraclass correlation coefficient (ICC) was used in assessing validity/reproducibility for lightness and chroma, Kappa statistics were used for hue. A level ≥0.75 was pre-established for ICC and ≥0.60 for the Kappa index. RESULTS OF VISUAL COLOR ASSESSMENT: Validity for lightness was good for both thicknesses; agreement rates for hue were inconsistent. ELECTRONIC MEASUREMENT: Validity for lightness was fair to good, hue values were below 0.60. Reproducibility of lightness was good to very good for both reference systems. Hue values (VITAPAN Classical(®)) for 1.6 mm test specimens were upside, for 2.6 mm below 0.60, Kappa values for 3D-Master(®) were ≥0.60 for all measurements, reproducibility of chroma was very good.

CONCLUSION

Validity was better for visual than for electronic color assessment. Reproducibility of the electronic device by means of the Shade Inspector™ was given for the VITAPAN Classical(®) and 3D-Master(®) systems.

目的

本研究旨在通过Shade Inspector™将视觉颜色评估和电子牙齿颜色测量系统与金标准进行比较，检验其有效性。此外，还通过两个参考系统证明了电子测量的可重复性。

材料与方法

使用了两种厚度（h = 1.6毫米，h = 2.6毫米）的陶瓷标本。三名经验丰富的牙科技术人员使用VITAPAN Classical®比色板进行了所有视觉测试。通过VITAPAN Classical®比色板的明度和色调，分别对两种厚度的视觉评估和电子测量的有效性进行了确认。通过VITAPAN Classical®和3D-Master®确认了电子测量的可重复性。3D-Master®数据根据明度、色调和彩度进行计算。组内相关系数（ICC）用于评估明度和彩度的有效性/可重复性，Kappa统计量用于评估色调。预先设定ICC≥0.75，Kappa指数≥0.60。视觉颜色评估结果：两种厚度的明度有效性均良好；色调的一致率不一致。电子测量：明度有效性为中等至良好，色调值低于0.60。两种参考系统的明度可重复性均为良好至非常好。1.6毫米测试标本的色调值（VITAPAN Classical®）偏高，2.6毫米的低于0.60，3D-Master®的所有测量Kappa值≥0.60，彩度的可重复性非常好。