Dental material color
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This document discusses color and light perception as they relate to aesthetics in prosthodontics. It covers the nature of light as both particles and waves, how white light is composed of all visible wavelengths, and color measurement in terms of hue, value, and chroma. Additive and subtractive color mixing are explained using primary colors. Factors that can affect color perception like lighting, color blindness, and metamerism under different light sources are also outlined.
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Dental material color
- 1. 1 IN THE NAME OF GODIN THE NAME OF GOD
- 3. 3 COLOR IS PROBABLY THE MOSTCOLOR IS PROBABLY THE MOST IMPORTANT DETERMINANT OFIMPORTANT DETERMINANT OF EASTHETICSEASTHETICS IN PROSTHODONTICSIN PROSTHODONTICS ► ESTHETIC IS THE FIRST DEMAND OFESTHETIC IS THE FIRST DEMAND OF PATIENTSPATIENTS .
- 4. 4 THE EYE AND COLOR PERCEPTION
- 5. 5 The nature of lightThe nature of light ►Light is electromagnetic (EM) radiation, the fluctuations of electric and magnetic fields in nature ►Light has the properties of both particles and waves. ►Light particles, called photons, radiate from their source in a wave pattern at a constant speed of 186,000 miles per second.
- 6. 6 ► They are measured by wavelength, the distance between two crests (in meters or, sometimes, in angstroms which are 1/100,000,000th of a meter), and by amplitude, the vertical distance between the crest and the trough.
- 7. 7 The part of the spectrum below 380 includes: ultraviolet x-ray gamma rays The wavelengths longer than 750: infrared microwaves Television and radio waves
- 8. 8 THE NATURE OF LIGHTTHE NATURE OF LIGHT
- 9. 9 PURE WHITE LIGHTPURE WHITE LIGHT ► Equal quantitition of energy over the visible range ► When passed through a prism white light is broken down into its component wave lenghts ► Longer waves are reflected less than shorter ones
- 10. 10
- 11. 12 CCOOLLOORR
- 12. 15 HH ,,VV // CC
- 17. 20 HH ,,VV // CC
- 19. 22 Subtractive color mixingSubtractive color mixing ► Primary colors: red yellow blue ► Secondary colors : orange green violet ► Complementary colors Black
- 20. 23 Additive color mixingAdditive color mixing •. Primary colors Red Green Blue • Secondary colors : Yellow Cyan Magenta •Complementary colors White
- 21. 24
- 22. 25 Opacity , Translucency , TransparencyOpacity , Translucency , Transparency
- 24. 30 FACTORS EFFECTING COLORFACTORS EFFECTING COLOR PERCEPTIONPERCEPTION ►DECEPTIVE COLOR PERCEPTION : complementary color effects each other and when placed side-by-side they may appear to increase chroma
- 25. 33 FACTORS AFFECTING COLOR PERCEPTION ►COLOR BLINDNESS: very few cannot see color at all,most have an inability to detect the differences in chroma (this is called monochromatism) ►requires then an alternative method of shade selection: -use of office staff -spatial training to overcome or adapt
- 26. 46 LIGHT IN DENTAL OFFICELIGHT IN DENTAL OFFICE ► Most common lighting is either: ► incandescent ► fluorescent ► Neither is pure white light ► -incandescent is higher yellow than blue ► fluorescent is higher than blue waves
- 27. 48 METAMERISMMETAMERISM ► AN OBJECT APPEARS TO BE INDIFFERENT COLORS WHEN VIEWED WITH DIFFERENT LIGHT SOURCES
Editor's Notes
- When placed side by side they appear to have a higher chroma When mixed they have the opposite effect : they neutralize each other Knowledge of the effect of complementary hues on each other is the key to precise shade control Most teeth contain small amount of all three primary shades. Thus green and violet ,which are not normally teeth colors ,can be helpful in reducing red or yellow in tooth shade.