3/28/2015 Color Fundamentals For Dentistry 1 3/28/2015 What is Color? 2 3/28/2015 Physiology of Color Perception 3 3/28/2015 Physiology of Color Perception 4 3/28/2015 Active or Additive Color Frequency of Light is transmitted 5 3/28/2015 Passive or Subtractive Color Frequencies of light absorbed except reflected color 6 3/28/2015 Practical Aspects •PFM Crowns use subtractive stains-often too high in value •All-Porcelain Crowns use additive color and subtractive color •Inexperienced labs too low in value-can raise value w cements 7 3/28/2015 Munsell System •Hue •Chroma •Value 8 3/28/2015 Hue Wavelength of Dominant Hue 700 nm 400 nm 9 3/28/2015 Chroma Saturation of Dominant Hue Low Chroma High Chroma 10 3/28/2015 Value Reflectivity or Grayness of the Hue Low Value High Value 11 3/28/2015 Value Black and White View Low Value High Value 12 3/28/2015 Similar Values Color View Different Hues 13 3/28/2015 Similar Values Black & White View Chroma Removed 14 3/28/2015 Hue Wavelength of Dominant Hue 15 3/28/2015 Chroma Intensity of Dominant Hue 16 3/28/2015 Value Brightness or Amount of Gray 17 3/28/2015 Practical Aspects •Most important aspect is value •Match value of adjacent teeth 18 3/28/2015 RGB Color •Transmitted Color •Used by television monitors •Cone receptors in eyes 19 3/28/2015 RGB Color White Television Screen 20 3/28/2015 RGB White=All Hues 21 3/28/2015 CMYK Color •Reflected Color •Used by printers •Film color negatives 22 3/28/2015 CMYK Black=All Hues 23 3/28/2015 LAB Color •“L”=Black •“A”=Green-Red •“B”=Blue-Yellow 24 3/28/2015 LAB Color-”L” 25 3/28/2015 LAB Color-”A” 26 3/28/2015 LAB Color-”B” 27 3/28/2015 Practical Aspects •Use VITA 3-D Shade System •Select Value First, Chroma Second, Then Hue •Use multiple light sources 28 3/28/2015 Metamerism • Colors appear different when viewed with varying light sources 29 3/28/2015 Metamerism VITA Shade Guides-Camera Flash 30 3/28/2015 Metamerism VITA Shade Guides-Outside Clouds 31 3/28/2015 Metamerism VITA Shade Guides-Fluorescent Lights 32 3/28/2015 Metamerism VITA Shade Guides-Incandescent Lights 33 3/28/2015 Metamerism Different Lighting-Similar Values 34 3/28/2015 Metamerism Hue Removed Similar Values 35 3/28/2015 Practical Aspects •Use multiple light sources •Ideally use 5500 Kelvin light 36 3/28/2015 Complimentary Colors To neutralize hue add comp color 37 3/28/2015 Complimentary Colors Result is decreased chroma, diminished value 38 3/28/2015 Complimentary Colors Cyan-Red 39 3/28/2015 Complimentary Colors Yellow-Purple 40 3/28/2015 Complimentary Colors Magenta-Green 41 3/28/2015 Practical Aspects •If tooth too yellow add purple (complimentary color) •Result is changed hue, decreased value 42
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