IADR Abstract Archives
Intra-instrumental Reproducibility of Color Analysis in Dental Research
Objectives: Evaluate CIE L*a*b* color value reproducibility of 3 different methods.
Methods: Four different shade blocks of Vita Mark II: 1M1, 1M2, 2M3 and 4M2 in 1.5mm thickness over neutral gray background were used for color measurement. CIELAB: L*a*b* values were measured by Xrite i5 spectrophotometer, EasyShade advance 4.0, and Adobe Photoshop software. Five consecutive readings were recorded from both Spectrophotometer and Easyshade Advance 4.0 for each shade twice in two different days. Five pictures on specimens illuminated under light source D65 in X-rite Macbeth Judge II were taken by Canon EOS 550D with EF100mm Macro lens. Five random points in the middle of each sample from each picture were analyzed by Adobe Photoshop and color values recorded. Color deviation to average (ΔE) were calculated for each sample then each shade values grouped and average recorded to compare among the measurement methods. L*a*b* values from each method were used to generate colors and evaluate if the produced color is similar or close to tooth colors or shade.
Results: For each method, color difference ΔE calculated for each shade color values to the mean values of the same method. Root Mean Square deviation (RMS) calculated for each method to show the repeatability of color measurement as presented in table I.
Values from the spectrophotometer were in the gray scale and far away from the tooth color range compared to values retrieved from EasyShade Advance 4.0 and Adobe Photoshop.
Conclusions: ● I5 Spectrophotometer has higher repeatability in color values analysis followed by EasyShade Advance 4.0 compared to Adobe Photoshop.
● Values from Spectrophotometer do not reflect the real color of the specimens as compared to EasyShade Advance 4.0 and Adobe Photoshop values.
Methods: Four different shade blocks of Vita Mark II: 1M1, 1M2, 2M3 and 4M2 in 1.5mm thickness over neutral gray background were used for color measurement. CIELAB: L*a*b* values were measured by Xrite i5 spectrophotometer, EasyShade advance 4.0, and Adobe Photoshop software. Five consecutive readings were recorded from both Spectrophotometer and Easyshade Advance 4.0 for each shade twice in two different days. Five pictures on specimens illuminated under light source D65 in X-rite Macbeth Judge II were taken by Canon EOS 550D with EF100mm Macro lens. Five random points in the middle of each sample from each picture were analyzed by Adobe Photoshop and color values recorded. Color deviation to average (ΔE) were calculated for each sample then each shade values grouped and average recorded to compare among the measurement methods. L*a*b* values from each method were used to generate colors and evaluate if the produced color is similar or close to tooth colors or shade.
Results: For each method, color difference ΔE calculated for each shade color values to the mean values of the same method. Root Mean Square deviation (RMS) calculated for each method to show the repeatability of color measurement as presented in table I.
Values from the spectrophotometer were in the gray scale and far away from the tooth color range compared to values retrieved from EasyShade Advance 4.0 and Adobe Photoshop.
Conclusions: ● I5 Spectrophotometer has higher repeatability in color values analysis followed by EasyShade Advance 4.0 compared to Adobe Photoshop.
● Values from Spectrophotometer do not reflect the real color of the specimens as compared to EasyShade Advance 4.0 and Adobe Photoshop values.