Stefan Ursu C.D.T.Stefan Ursu C.D.T.

SHADE MATCHING FOR Aesthetic SUCCESSSHADE MATCHING FOR Aesthetic SUCCESS

Shade MatchingShade 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

• 1930’s - Dr. Bruce Clark

• 1960’s & 70’s - Dr. R. Sproull, Dr. J.

Preston, Dr. S. Bergen. (SCAD)

• 1970’s-1980’s Dr. John McLean, Mr. Willi

Geller

• 1990’s - Present Dr. Stephen Chu, Dr.

Galip Gurel, Dr. Pascal Magne, Mr. Michel

Magne

History of color in dentistry

History of color in dentistry

Theory of ColorTheory of Color

Sir Issac NewtonSir Issac Newton

• -THE INTERACTION OF LIGHT WITH AN

• OBJECT MAKES COLOR PERCEPTION

• POSSIBLE -

The Physics of Light

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

The Physics of Light

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

The Physics of Light

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

The Physics of Light

Absorption - Process by which light is absorbed by the object.

The Physics of Light

Perception - Occurs in the brain. Rods perceive brightness and and cones perceive the hue

(color).

The Physics of Light

The Physics of Light

The perceived color of an object is the determined by the molecular density and

makeup of that object

The Physics of Light

Color in DentistryColor in Dentistry

Primary and Secondary Colors

Complementary Colors

Complementary colorsneutralize each other and form

grey

Prof. Albert D. Munsell

Munsell’s 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

Munsell’s Color Chart

Variables Affecting Color(perception)

Variables Affecting Color(perception)

ILLUMINATION

Light Intensity...

Light Quality...

Incandescent - 2856 K

Fluorescent - 4000 K

Color Corrected - 5500 K

FACTORS AFFECTING ILLUMINATION

•Metamerism

•Lighting

Conflicts

Metamerism- Phenomenon in which the

same object will look differently under different

lighting conditions.

Lighting Conflicts

- mixing of light sources

CONTRAST EFFECTS

Value Contrast

Value Contrast

Hue Contrast

Hue Contrast

Chroma Contrast

Chroma Contrast

Areal Contrast

Areal Contrast

Spacial Contrast

Spacial Contrast

Successive Contrast

Successive Contrast

VIEWER ASSOCIATEDEFFECTS

VIEWER-ASSOCIATED EFFECTS

1. Color Blindness

2. Age

3. Fatigue

4. Nutrition

5. Emotions

6. Binocular differences

7. Medication

DrugEffect on

R/O/YEffect on

B/G/P

Alcohol/Morphine

Lighter Darker

Caffeine Darker Lighter

Effects of Chemicals on Color Perception

Shade MatchingArmamentariumShade MatchingArmamentarium

Conventional

Technology-Based

Vita Classical and 3-D MasterShade Guides

Vita Easy-Shade System

Digital SLR Camera

CanonNikon

Nikon Micro 105mm F2.8 VR

Sigma EX Macro 105mmF2.8

Canon 100mm Macro EF

Macro/Micro Lens

7-Step Shade Matching Procedure

7-Step Shade Matching Procedure

1. Patient Evaluation

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?

2. Analysis

A1

B1

D2

2. Analysis

B1

2. Analysis

2. Analysis

3. Communication

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

Reference Shots

4. Interpretation

4. Interpretation

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

•A shade map is created using the ceramic system

language

4. Interpretation

5. Fabrication

5. Fabrication

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

6. Verification

6. Verification

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

7. Insertion/Placement

•The final test for a color

match.

7. Insertion/Placement

Suggested ReadingSuggested Reading

Suggested ReadingSuggested Reading

SHADE MATCHINGSHADE MATCHING

•History of shade

•Brief theory of color

•Variables affecting color

•Conventional and technology-based shade matching

•Shade Matching Procedure

•Clinical Cases

THANK YOU...THANK YOU...