A. Shade Selection

Color

A phenomenon of light (red, green, yellow, brown) or visual perception that permits the differentiation of otherwise identical objects

Adjacent tooth

Point of reference used as basis for shade selection of FPD

Opposite tooth

Point of reference used as basis for shade selection of RPD

• Incisal

• Opaque

• Body

• Neck

Parts of a Shade Tab (Guide)

• The observer

• The object

• The light source

Three factors acting upon which color is dependent

The observer

The dentist/clinician

The object

Modifies the light that falls on it by absorbing, reflecting, transmitting, or refracting part of all of the light energy, thereby producing the quality of color

The light source

Have a definite effect on the perception of color

• Natural light

• Fluorescent light

• Incandescent

Three light sources

Natural Light

Light from sunlight

Fluorescent

Light from the bulb/lamp of the room/clinic

Incandescent light

Dental chair light

• Hue (A,B,C,D)

• Chroma (1,2,3)

• Value

Three characteristics of Color

Hue

Refers to the quality that distinguishes one color from another

Chroma

Refers to the degree of saturation

Value

Refers to the brightness or darkness of the color

Yellowish

A series

White

B series

Grayish

C series

Very dark

D series

Thin enamel and thick dentin

Why is cervical shade slightly yellow compared to incisal shade that is translucent?