Stefan Ursu C.D.T.

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SHADE MATCHING FOR Aesthetic SUCCESS

• Stefan Ursu C.D.T.

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Shade Matching

• History of Color in Dentistry
• Theory of color
• Variables affecting color
• Conventional and technology-based shade matching
• Shade Matching Procedure
• Clinical Cases
• Clinical Cases

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History of color in dentistry

• 1930s - Dr. Bruce Clark
• 1960s 70s - Dr. R. Sproull, Dr. J.
  Preston, Dr. S. Bergen. (SCAD)
• 1970s-1980s Dr. John McLean, Mr. Willi Geller
• 1990s - Present Dr. Stephen Chu, Dr. Galip
  Gurel, Dr. Pascal Magne, Mr. Michel Magne

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Theory of Color
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Sir Issac Newton
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• -THE INTERACTION OF LIGHT WITH AN
• OBJECT MAKES COLOR PERCEPTION
• POSSIBLE -

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The Physics of Light
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The Physics of Light

• Emission - The source of light. Produced by
  physical or chemical processes.

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The Physics of Light

• Transmission - Process by which light passes
  through a translucent or transparent object.

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The Physics of Light

• Reflection - occurs when light strikes a solid
  object and bounces off of it.

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The Physics of Light
Absorption - Process by which light is absorbed
by the object.
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The Physics of Light
Perception - Occurs in the brain. Rods perceive
brightness and and cones perceive the hue (color).
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The Physics of Light
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The Physics of Light
The perceived color of an object is the
determined by the molecular density and makeup of
that object
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Color in Dentistry
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Primary and Secondary Colors
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Complementary Colors
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Complementary colors neutralize each other and
form grey
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Prof. Albert D. Munsell
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Munsells Color Chart
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Munsells Color Chart
Hue - Color tone, the actual color Chroma -
Saturation, purity of color Value - Relative
lightness/darkness of the color Translucency -
The degree to which light is transmitted rather
than absorbed or reflected in a given restoration
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Variables Affecting Color(perception)
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ILLUMINATION
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Light Intensity...
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Light Quality...
Incandescent - 2856 K
Fluorescent - 4000 K
Color Corrected - 5500 K
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FACTORS AFFECTING ILLUMINATION

• Metamerism
• Lighting Conflicts

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Metamerism
- Phenomenon in which the same object will look
differently under different lighting conditions.
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Lighting Conflicts
- mixing of light sources
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CONTRAST EFFECTS
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Value Contrast
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Value Contrast
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Hue Contrast
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Hue Contrast
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Chroma Contrast
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Chroma Contrast
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Areal Contrast
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Areal Contrast
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Spacial Contrast
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Spacial Contrast
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Successive Contrast
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Successive Contrast
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VIEWER ASSOCIATED EFFECTS
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VIEWER-ASSOCIATED EFFECTS

1. Color Blindness
2. Age
3. Fatigue
4. Nutrition
5. Emotions
6. Binocular differences
7. Medication

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Effects of Chemicals on Color Perception
Drug Effect on R/O/Y Effect on B/G/P
Alcohol/Morphine Lighter Darker
Caffeine Darker Lighter
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Shade MatchingArmamentarium
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Conventional
Technology-Based
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Vita Classical and 3-D Master Shade Guides
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Vita Easy-Shade System
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Digital SLR Camera
Canon
Nikon
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Macro/Micro Lens
Sigma EX Macro 105mmF2.8
Nikon Micro 105mm F2.8 VR
Canon 100mm Macro EF
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7-Step Shade Matching Procedure
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1. Patient Evaluation
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1. Patient Evaluation
- Are there any contrast effects present? - How
will shade selection of one restoration affect
overall smile? - How will adjacent and opposing
dentition affect shade matching? -
Polycromatism/High translucency/high opacity?
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2. Analysis
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2. Analysis
A1
B1
B1
D2
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2. Analysis
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2. Analysis
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3. Communication
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3. Communication

• Reference photographs of shade system suggested
  shades including full smile photos and photos of
  surrounding dentition
• Shots from different angles and lighting
  conditions
• Use of 18 gray card to eliminate color
  distractions
• Electronic transfer of tech-based shade systems
  and photos

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Reference Shots
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4. Interpretation
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4. Interpretation

• Shade tab information is interpreted and
  converted into the nomenclature of the ceramic
  system used

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4. Interpretation

• A shade map is created using the ceramic system
  language

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5. Fabrication
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5. Fabrication

• Restoration is fabricated using the materials
  that would best match the surrounding dentition

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6. Verification
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6. Verification

• Restoration is checked for accuracy with
  Easy-Shade System AND with conventional shade
  tabs.

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7. Insertion/Placement
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7. Insertion/Placement

• The final test for a color match.

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Suggested Reading
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Suggested Reading
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SHADE MATCHING

• History of shade
• Brief theory of color
• Variables affecting color
• Conventional and technology-based shade matching
• Shade Matching Procedure
• Clinical Cases

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THANK YOU...
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Stefan Ursu CDT Aesthetic DesignStudio info_at_Aesthe
ticDesignStudios.com