Shade taking Flashcards

1
Q

What are the 3 components of colour?

A
  • Hue
  • Value
  • Chroma
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2
Q

What is hue?

A

The specific wave length of light, any of the primary colours individually or blended together. (A,B,C,D)

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3
Q

What is value?

A

The lightness or darkness of a colour.

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4
Q

What is chroma?

A

The intensity of a colour/saturation due to the concentration of a pigment (number).

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5
Q

Describe the VITA shade guide.

A

Divided into hue groups:
- A: reddish brown
- B: reddish yellow
- C: grey
- D: reddish grey

Divided into chroma (intensity of pigment):
- 1 = low chroma
- 4 = high chroma

Can be arranged by value (lightest to darkest, top image) or arranged by hue group (bottom image).

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6
Q

What tips should you remember for shade taking in practice?

A
  • Have a neutral-coloured environment
  • Remove bright lipstick
  • Drape patient in neutral cloth if wearing bright clothing
  • Make intial shade choice in daylight and check under different light sources if possible
  • Check hue group first, then decide chroma
  • Compare results with a shade guide
  • Assess shade using the middle third of the shade tab
  • Use canines as a reference as they have the highest chroma and most dominant hue
  • Assess incisal edge separately
  • Take shade at beginning of appointment (cones of eye fatigue within 20 seconds)
  • Look at blue card between appointments
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7
Q

How do you chart tooth shade on a lab prescription?

A
  • Tooth divided into 9 sections
  • Central square decides the body colour
  • Incisal edge shade: write ‘en’ so technician knows it is the enamel colour
  • Draw line to show where body colour and enamel colour transition (solid = harsh transition, dotted = faded)
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8
Q

What can be added to a crown or veneer to better match a patient’s natural tooth?

A

Stain
- Replicate natural tooth staining using stain guides

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9
Q

Why may a restoration shade not match?

A
  • Thickness of shade guide, VITA shade guide tabs are 5mm thick, for a crown the enamel will be 1mm thick or less so the colour will be different
  • Mixing of prescriptions- if you are doing all ceramic crowns and some metal ceramic crowns, the all ceramic crowns will always look better
  • Design of metalwork (metal substructure dictates how much room you have for ceramic on top)
  • Black line at margins for metal ceramic crowns
  • Prepare teeth as pairs wherever possible e.g. 4 anterior teeth: do the 2 laterals together and the 2 centrals together
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