Department of Prosthodontics, A B Shetty Memorial Institute of Dental Sciences, NITTE (Deemed to be University), Deralakatte, Mangalore, Karnataka, India.
Indian J Dent Res. 2020 Sep-Oct;31(5):712-717. doi: 10.4103/ijdr.IJDR_286_19.
There is an increased awareness for aesthetically pleasing restorations among patients in current practice. Due to variability in the natural tooth colour, shade selection becomes an intricate procedure. The aim of this study is to determine which of the three named methods is more accurate for shade selection in aesthetic dentistry.
Two VITAPAN classical shade guides were used for this study. Nine shades were selected from the first shade guide (A1, A2, A3.5, B1, B2, B3, C1, C2, C3) and the number was concealed. Ten selected participants were asked to identify each concealed shade with the second shade guide. Canon 5D camera with ISO 200, shutter speed 1/100 sec, F22 was used for capturing images of the second shade guide. Photoshop CS3 Software was used for developing the digital shade guide. The participants were asked to match the shades from the first shade guide with the prepared digital shade guide. The third photographic shade guide was prepared using a polarised filter on the Canon 5D camera with the same settings. The participants were asked to match shades with the prepared photographic shade guide.
Total observations made during the study were 270. Cross table statistical analysis (Chi-square test) done using SPSS 20.0 showed statistically significant difference between conventional and digital photography (P = 0.049). Analysis between digital photography and polarizing filter photography did not reveal a significant association (P = 0.181).
Digital photographic method was most accurate among the three shade selection methods. It can be used to obtain aesthetic results.
在当前实践中，患者对美观修复的意识日益增强。由于天然牙齿颜色的变化，色调选择成为一个复杂的过程。本研究旨在确定在美学牙科中，三种命名方法中哪一种更准确地进行色调选择。
本研究使用了两个 VITAPAN 经典比色板。从第一个比色板（A1、A2、A3.5、B1、B2、B3、C1、C2、C3）中选择了九个色调，并将编号隐藏。十位选定的参与者被要求用第二个比色板识别每个隐藏的色调。使用 ISO 200、快门速度 1/100 秒、F22 的 Canon 5D 相机拍摄第二个比色板的图像。使用 Photoshop CS3 软件开发数字比色板。要求参与者将第一个比色板中的色调与准备好的数字比色板相匹配。使用 Canon 5D 相机上的偏光滤镜准备第三个摄影比色板，并使用相同的设置。要求参与者将色调与准备好的摄影比色板相匹配。
在研究期间共进行了 270 次观察。使用 SPSS 20.0 进行的交叉表统计分析（卡方检验）显示，传统摄影和数字摄影之间存在统计学显著差异（P = 0.049）。数字摄影和偏光摄影之间的分析没有显示出显著的相关性（P = 0.181）。
在三种色调选择方法中，数字摄影方法最准确。它可以用于获得美学效果。
