24. Uluslararası Estetik Diş Hekimliği Kongresi , İstanbul, Turkey, 23 - 25 October 2020, pp.1-11
Background: According to "biomimetic approach", the changes in the formulations of new composite resin materials that imitate dental tissues, create differences in the reflection, absorption and refraction of light. Therefore, the correct determination of tooth color using new materials is an important step in the success of an aesthetic restoration. The aim of the present study is to evaluate the consistency of hue, value and chroma values determined with a color scale under different lighting conditions.
Methods: The color determination of right upper incisors of total of 100 patients (52 female and 48 male) who applied to Istanbul University Restorative Dentistry Department, were examined by 3 different observers with Vitapan 3D Toothguide Master color scale under different lighting conditions such as reflector light, daylight and Demetron Shade Light (Kerr). In addition, the results were converted into the Vita Classic color scale and evaluated as well. The data were analyzed in the SPSS program.
Results: “Value”s were found to be significantly consistent under reflector and Demetron lighting compared to other groups (p<0.05). Hue and chroma values were found to be significantly consistent under daylight and Demetron lighting compared to other groups (p<0.05). Color evaluation results of all lighting conditions were found to be significantly more consistent in the Vita Classic color scale (11%) compared to the Vitapan 3D Toothguide Master scale (2%). While D3 color key was matched more in all groups, in the light colors, A1 color was matched almost all groups. The consistency in demetron and reflector lighting is mostly seen in dark colors (D3). There was no significant difference between light and dark colors in daylight / demetron and daylight / reflector groups (p>0,05).
Conclusion: According to the results determined by the 3D Toothguide shade master under all 3 lighting conditions, the least success was achieved in determining the saturation (chroma) ratios of colors. In the color determination of the Vita Classic scale, dark colors were the most consistent. To conclude, the consistency in the color detection of the observers depends on the lighting condition and color scale. The spectrophotometer, which can obtain objective and numerical data, can be used along with other methods in color determination.
Keywords: Lighting conditions, Tooth color, Color assessment, Color guide.