shade selection

Question 1

“What does the color of an object depend on?” ==

Answer 1

The color depends on the light source, object properties, and human visual interpretation.

Question 2

“What part of the electromagnetic spectrum is visible to the human eye?” ==

Answer 2

380 to 750 nanometers.

Question 3

“What happens when pure white light passes through a prism?” ==

Answer 3

It splits into its component colors.

Question 4

“What are the three primary colors in the visible light spectrum?” ==

Answer 4

Red, green, and blue.

Question 5

“What is the result of mixing red and green in the light-mixture system?” ==

Answer 5

Yellow.

Question 6

“What type of mixing is used in the pigment-mixture system?” ==

Answer 6

Subtractive color mixing.

Question 7

“What are complementary colors on the color wheel?” ==

Answer 7

Colors directly opposite each other on the color wheel.

Question 8

“How are colors mixed to produce an achromatic result?” ==

Answer 8

By mixing a color with its complementary color or three primary colors.

Question 9

“What three dimensions are used to describe color?” ==

Answer 9

Hue, value, and chroma.

Question 10

“What is hue in the Munsell color order system?” ==

Answer 10

Hue is the quality that distinguishes one color family from another, like red from blue.

Question 11

“What range does value cover in the Munsell system?” ==

Answer 11

Value ranges from 0 (black) to 10 (white).

Question 12

“How does Munsell define chroma?” ==

Answer 12

Chroma is the quality that distinguishes strong colors from weak colors.

Question 13

“Where are hues located in the Munsell color solid?” ==

Answer 13

Hues are uniformly spaced around the central axis of the color wheel.

Question 14

“What hue range is found in natural human teeth?” ==

Answer 14

Yellow-red to red.

Question 15

“What does a dental shade guide help with?” ==

Answer 15

Determining the closest color match to natural teeth.

Question 16

“What is the optimal light source for shade selection?” ==

Answer 16

Northern-exposure sunlight in the middle of the day.

Question 17

“What is metamerism?” ==

Answer 17

Metamerism is when two objects appear to match in color under one light source but not another.

Question 18

“How can squinting help in shade selection?” ==

Answer 18

Squinting shifts visual response to peripheral retinal areas where rods predominate, enhancing value perception.

Question 19

“How can surrounding colors affect shade selection?” ==

Answer 19

Bright colors around the patient can reflect onto the teeth, altering perceived color.

Question 20

“Why should lipstick be removed before shade selection?” ==

Answer 20

Lipstick can interfere with the perceived color of the teeth.

Question 21

“What background color is ideal for color matching in the dental room?” ==

Answer 21

Light gray is ideal for color matching.

Question 22

“When should shade selection ideally occur?” ==

Answer 22

At the diagnostic appointment when a ceramic restoration is determined to be necessary.

Question 23

“How does eye fatigue affect shade selection?” ==

Answer 23

Continuous viewing causes similar colors to blend together, making accurate matching difficult.

Question 24

“What patient position is best for shade selection?” ==

Answer 24

The upright position, with teeth at the observer’s eye level.

Question 25

“Why should the teeth be kept moist during shade selection?” ==

Answer 25

Dehydration increases the value of a tooth, altering its color appearance.

Question 26

“What unique tooth characteristics should be noted for lab technicians?” ==

Answer 26

Characteristics like enamel cracks, hypocalcification, and proximal stain.

Question 27

“Why should the shade selection be done at a distance?” ==

Answer 27

3-6 feet from the teeth, as it’s closer to conditions under which teeth are normally observed.

Question 28

“Who can help verify the shade selection?” ==

Answer 28

A second person, such as a dental assistant, can provide another opinion.

Question 29

“Why should verification of shade selection be done at multiple appointments?” ==

Answer 29

To confirm consistency in color selection under different conditions.