Rough composite fillings scatter more light thus appear opequewhere as smooth highly polished filling do not. Esthetics play a very important role in modern dental treatment. The ideal restorative material should match the color of the tooth it restores. In maxillofacial prosthetics the color of the gums, external skin and the eyes have to be duplicated. Clinically in the operatory or dental lab, color selection is usually done by the use of shade guides.

1. Topic:- Optical Properties And Color
Guided By:- Dr.Rajul Vivek Sir
Presented By
Abhiraj And Abhishek Kumar
Batch:-BDS 1st Year
(2022-23)

2. Topic –Optical Properties
And Color
Introduction
Dimension Of Color
Metamerism
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Metamerism
Transparency
Translucency
Opacity
Fluorescence
Clinical Considerations

3. Light
Light is form of visible energy that is a part of the electromagnetic spectrum and
possesses specific wavelength.
Wavelengths are measured in nanometer
The wavelength of visible light that can be perceived by the human eye is 380 to
The wavelength of visible light that can be perceived by the human eye is 380 to
750 nm
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4. Cone shaped cell in
the retina are
responsible for color
vision in human eye .
Light
vision in human eye .
In order for color to
exists there need to be
interaction between 3
elements.
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Colour
Viewer object

5. Dimensions of color
There are three dimensions of color are.
Hue
Refers to the basic color of an object
Example: whether it is red, green or blue.
Example: whether it is red, green or blue.
Value
It represents the lightness or darkness of a color.
Chroma
It is a strength of a color or it is a mesurement of color intensity.
Higher the chroma, the more intense is the color.
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6. Metamerism
The appearance of an object depends on the
type of the light by which the object is viewed.
type of the light by which the object is viewed.
Daylight ,incandescent lamps are all common
sources of light in the dental operatory.
Objects that appears to be color matched
under one type of light may appears very
different under another light source. This
phenomenon is called metamerism.
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7. Transparency
Transparency is the property
of material that allow the
of material that allow the
passage of light in such a
manner that objects can be
clearly seen through them
Example-glass and clear acrylic
resin.
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8. Translucency
Translucency is the property of
materials that allow the passage of
materials that allow the passage of
some light but disperses (scatters or
reflects ) the rest show that objects
cannot be clearly seen through them
Example:- dental porcelain, composite
resin and pigmented acrylic resin.
Teeth and oral tissue are translucent
in nature. 8

9. Opacity
Opacity is the property of
Opacity is the property of
materials that prevents the passage
of light. An opaque material either
absorbs or reflects all of the light.
when all light is absorbed the
materials appear black.
Example:- metals
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10. Fluorescence
Natural tooth structure also absorbs
light of wavelengths which are too short
to be visible to the human eye. These
to be visible to the human eye. These
wavelengths between 300 to 400 nm are
referred as near ultraviolet. Natural
sunlight, photoflash lamps, certain types
of vapor lamps and the ultraviolet lights
used in decorative lighting are all
sources containing substantial amounts
of near U-V radiation and invisible U-V
light. 10
poor translucency exhibited by
the metal-ceramic restoration
on the right when compared to
the natural teeth

11. Relevance
Some patients want their
restorations to match natural
restorations to match natural
tooth under fluorescent light
conditions, e.g., in stage shows
and discotheques. Some porcelain
restorations are able to match the
natural teeth under fluorecent
lighting.
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Natural teeth exhibiting fluorescence.

12. This energy that the tooth
absorbs is converted into light with
larger wavelengths, in which case
the tooth actually becomes a light
source. The phenomenon is called
fluorescence . The emitted light is
fluorescence . The emitted light is
primarily in 400-450 nm range,
having blue white color. Improved
flourescence adds esthetic value to
artificial restorations.
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13. Clinical Considerations
Rough composite fillings scatter more light thus appear opeque
where as smooth highly polished filling do not.
Esthetics play a very important role in modern dental treatment.
Esthetics play a very important role in modern dental treatment.
The ideal restorative material should match the color of the tooth
it restores. In maxillofacial prosthetics the color of the gums,
external skin and the eyes have to be duplicated. Clinically in the
operatory or dental lab, color selection is usually done by the use
of shade guides.
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14. THANK YOU
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