(from chu, sj et al. fundamentals of color: shade matching ... · pdf filethe munsell color...
TRANSCRIPT
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(from Chu, SJ et al. Fundamentals of Color: Shade Matching and Communication In Esthetic Dentistry. Quintessence 2004)
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Color and Shade Selection
Edmond R. Hewlett, D.D.S.
Esthetic Dentistry RT443cUCLA School of Dentistry
Spring, 2005
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Overview
SeeColor science & perceptionTooth optics
EnableThe environment
CommunicateVita Shade GuidesPhotos
E. Hewlett, DDS
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What is Color?
E. Hewlett, DDS
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What is Color?
Color is defined as the quality of an object or substance with respect to light reflected by it, usually determined visually by measurement of hue, chroma, and value.
E. Hewlett, DDS
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The Munsell Color System
Professor A.H MunsellBasic principles first published in 1905
Munsell Color CompanyEst. 1918 to develop color standards
Continued development at Nat’l. Bureau of Standards, Optical Soc. of America
E. Hewlett, DDS
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The Munsell Color System
1940’s - Revised Munsell system standardized by:
International Commission on Illumination (CIE).American Society for Testing and Materials
Munsell System is an internationally-accepted standard for art, science, and industry
E. Hewlett, DDS
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The Munsell Color System
Color components:
Hue
Chroma
Value
E. Hewlett, DDS
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Hue
The color itself
The attribute of a color by which we distinguish red from green, blue from yellow, etc
E. Hewlett, DDS
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Chroma
The intensity of the color
Low chroma ≡ “weak”
High chroma ≡“highly-saturated”
E. Hewlett, DDS
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Value
The brightness of the color
High value = brighter (more white)Lower value = darker (more gray)
Value of 0 = blackValue of 10 = white
E. Hewlett, DDS
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Value (Brightness, aka Lightness)
Brightness is the most important color variable in dental shade selection!
E. Hewlett, DDS
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Munsell Color Space
Arrangement of all colors according hue, chroma, and value in a 3-D space
E. Hewlett, DDS
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Other Color Terms
Opacityimpenetrable by lightreflective – neither transparent or translucent
Transparencycapable of transmitting light
Translucencydiffused transmission of light
E. Hewlett, DDS
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Color Perception
E. Hewlett, DDS
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Color Perception
Similar colors appear different under different conditions due to
Light source type and angulationSize and shape differencesInfluence of background color & lightingPerception angle (perception is altered by direction and reflection)
E. Hewlett, DDS
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Perception
eye
environment object surface
E. Hewlett, DDS
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Perception
eye
environment object surface
E. Hewlett, DDS
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The Human Eye
Receptors: rods and conesRods convey shades of gray (value)Cones allow brain to perceive color hues and chroma
E. Hewlett, DDS
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The Human Eye
Colorblindness affects…1-in-300 females1-in-13 males
Get tested
E. Hewlett, DDS
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Illumination
Everything that we see is reflected lightFull spectrum light is needed to see colorColor missing in the light source cannot be reflected
E. Hewlett, DDSImage from Chu, et al 2004
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Illumination Sources
Daylight (6500° K)Variable, depending on time of day, cloud cover, etc.
Electronic flash (5500 ° K)Standardized light source (for industrial color measurement)
5000° KCRI 98 (Color Rendering Index)
E. Hewlett, DDS
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Illumination Sources
Recommended lighting for accurate shade taking in dentistry:
5500 ° KReplicates northern natural midday daylightbalances all hues in the spectral curve
Working distance: 12 to 15 inchesArm’s length
Appropriate environment
E. Hewlett, DDS
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Color corrected source (5, 500 K)
Incandescent source
(2,856 K)
Fluorescent source (4,000 K)
images from Chu, et al 2004
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Illumination
Use the appropriate illumination source!
E. Hewlett, DDS
incandescent
5,500 K
fluorescent
images from Chu, et al 2004
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Metamerism
Objects that appear similar under one condition but different under another.i.e., an object appears to be different colors when viewed under different light sources
E. Hewlett, DDS
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Color corrected source (5, 500 K)
Incandescent source
(2,856 K)
Fluorescent source (4,000 K)
images from Chu, et al 2004
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images from Chu, et al 2004
Metameric Pair
E. Hewlett, DDS
5,500 K Fluorescent Incandescent
Tooth #8 – unrestoredTooth #9 – crown
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Metamerism
Easy to recognize, impossible to controlNewer materials help
chameleon effect; fluorescenceMay need to explain to patientFor dental ceramics:
More opaque porcelain ⇒ more metamerism!
E. Hewlett, DDS
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Key Optical Properties of Teeth
FluorescenceOpalescenceTranslucency
images from Chu, et al 2004E. Hewlett, DDS
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Fluorescence
Emission of visible light upon exposure to fluorescent lightDentin >> Enamel
images from Chu, et al 2004E. Hewlett, DDS
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Fluorescence
Emission of visible light upon exposure to fluorescent lightDentin >> EnamelOpaceous dentin porcelains
Dentin-like fluorescenceReduced metameric effect
images from Chu, et al 2004E. Hewlett, DDS
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Opalescence
Ability of a translucent material to…appear blue in reflected lightappear red-orange in reflected light
images from Chu, et al 2004E. Hewlett, DDS
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Opalescence
Under direct illumination…reflectance of short wavelengths (blue)Absorption of long wavelengths (red-orange)
images from Chu, et al 2004E. Hewlett, DDS
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Opalescence
Under transillumination…reflectance of long wavelengths (red-orange)absorption of short wavelengths (blue)
images from Chu, et al 2004E. Hewlett, DDS
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Opalescence
Enamel >> Dentinmore translucent, more crystalline
Incisal porcelainsCan mimic enamel opalescence
images from Chu, et al 2004E. Hewlett, DDS
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Translucency
Transmission and diffusion of lightConveys depth
and vitality
image from Chu, et al 2004E. Hewlett, DDS
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Translucency
Avoid excessive translucencylowers valuerestoration is too
grey/dark
image from Chu, et al 2004E. Hewlett, DDS
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Translucency
Avoid inadequate translucency (excessive opacity)
too much reflectancelifeless appearance
Axial reduction!
E. Hewlett, DDS
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Control the Environment
Must surround teeth with color that aids color perceptionUse neutral colors in operatoryClose blinds
window light = daylight = contamination Cover brightly-colored clothingNo lipstick!
E. Hewlett, DDS
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Always use a bibColor space of natural teeth = OrangeCompliment to orange is blue
∴ Use blue patient bibs
E. Hewlett, DDS
Control the Environment
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Shade Determination
Shade Communication
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Vita Shade Guide (Vitapan Classical)
Introduced in 1956
A = OrangeB = Yellow orangeC = Grey orangeD = Brown orange
E. Hewlett, DDS
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Vita Shade Guide (Vitapan Classical)
Limitations:not uniformly positioned throughout tooth color spaceno standard incre-mental difference between adjacent shadesin-between shades (e.g. “A2.5”) are inaccurate
E. Hewlett, DDS
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Shade Selection w/ Vitapan Classical
1. Select hue first70% will be A20% will be D10% will be B or C
(Choosing lots of B and C?)
(Check light source)(Check for colorblindness)
2. Select chroma for the chosen hue group
3. Verify value
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Introduced in 1998Reflects distribution of tooth shades in natureSystematic and equi-distant coverage of the natural tooth shade spectrum
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Design:
5 value levels (1-5) arranged left to right
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Design:
3* chroma levels (1-3) in each value group, arranged top to bottom
*(only 2 chroma levels for value group #1)
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Design:
(up to) 3 hue levels (L,M,R) for each chroma level, arranged left to right
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Procedure1. Select value (lightness)
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Procedure1. Select value (lightness)
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Procedure1. Select value (lightness)
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Procedure2. Select chroma from
within the selected value groupUse “M” tabs from the selected value groupChoosing between diluted & saturated
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Procedure3. Select hue from
within the selected value groupIs the natural tooth more reddish (R) or more yellowish (L) than the M group?
E. Hewlett, DDS
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Vita 3D-Master Shade Guide
Bleached shades now available
0M1, 0M2, 0M3Bleached shades occupy the “leftmost”(brightest) value group (group #0) on the 3D-Master guide.
E. Hewlett, DDS
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Shade Selection Keys
Use correct environment and lightingSelect shade at beginning of app’t.Patient sitting uprightViewing distance ~15 in. from teethPatient’s teeth/dentist’s eyes at same level
E. Hewlett, DDS
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Shade Selection Keys
Photograph shade tabs which match specific segments of teethPhotograph textureNote special characteristics
E. Hewlett, DDS
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Shade Selection Keys
Look for variance between gingival, middle, and incisal thirds of teeth.
E. Hewlett, DDS
higher chroma & opacity
less chroma, higher value
high translucency, lower value
image from Chu, et al 2004
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Photographs for Lab Communication
E. Hewlett, DDS
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Texture Photograph
Close-up of anteriors with lens ⊥ to labial surface
Emphasizes surface texture and luster
E. Hewlett, DDS
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Color Photograph
Close-up of anteriors with lens angled 15-20º to labial surface
Reflections bounce away from camera, revealing color and characterization
E. Hewlett, DDS
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Photographs with Shade Tabs
Angle camera to avoid reflections from tab and teethShow at least 6-8 teethTab at same angle as teethTab as close to teeth as possible
E. Hewlett, DDS
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Photographs with Shade Tabs
Tab and handle clearly visible, no reflections
Shoot as many photos as necessarydifferent tabs for different areas of teeth
E. Hewlett, DDS
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Photos for All-Ceramic Restorations
Shade tab w/ teeth before preparationShade tab w/ prepared tooth/teethDesired shade(s) next to preparation(s)
E. Hewlett, DDS
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Other Lab Communication Photos
Photos of provisionalsViews 5, 6, 7, & 8 as indicated
Shade photo of provisionalsIf restoration doesn’t match, photograph it in mouth with tabs
E. Hewlett, DDS
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Digital Shade-Taking Devices
E. Hewlett, DDSimages from Chu, et al 2004
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Digital Shade-Taking Devices
What are they?RGB devices, spectrophotometers, or colorimeters designed or modified for dental use
E. Hewlett, DDSimages from Chu, et al 2004
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Digital Shade-Taking Devices
What can they do?Provide detailed data on shades in different zones of a tooth’s surface
E. Hewlett, DDSimages from Chu, et al 2004
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Digital Shade-Taking Devices
LimitationsNot reliable for complex characteristics
sub-surface colorTranslucencyTexture effects
E. Hewlett, DDSimage from Chu, et al 2004
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Digital Shade-Taking Devices
Bottom LineNOT a replacement for traditional methodsBest used as an ADJUNCT to traditional methods and photography
+ +
E. Hewlett, DDSimages from Chu, et al 2004