Shade Assessment and Lab Communication

Question 1

What factors to consider in aesthetic restoration?

Answer 1

Shape
Colour
Translucency
Surface texture

Question 2

How can shape be communicated?

Answer 2

Can be simple if there is adjacent teeth

• Use study cast - copy what was there
• Photos
• Diagnostic wax-up - esp if crowning +1 anterior teeth

Question 3

What can diagnostic wax-up show?

Answer 3

Shape and aesthetic
Tooth reduction
Occlusal contact
OVD

Question 4

2 ways of communicating colour?

Answer 4

1. Subjective shade assessment

2. Objective shade assessment

Question 5

What is subjective shade assessment?

Answer 5

Colour perceived by

1. Illuminant: lighting condition
2. Object
3. Observer

Question 6

What is objective shade assessment?

Answer 6

Use digital images
Colorimeter

(see RVC for specific names)

Question 7

How is colour described?

Answer 7

Munsell system

1. Hue = colour family (colour of tea)
2. Chroma = saturation/ intensity (how long brewed)
3. Value = lightness of colour (milk added)

Question 8

What is limitations of classic shade guide?

Answer 8

Shades don’t cover entire colour space (area on chart which all natural tooth colour lies in)
Not evenly distributed and can’t mix shades

Question 9

How should you use shade guide to pick colour?

Answer 9

Find correct value
Then select chroma
Then determine hue

Question 10

How to communicate surface texture?

Answer 10

1. Photo

2. Study cast - can see surface detail

Question 11

Best way to take shade of tooth?

Answer 11

Hydrated teeth
Switch off operating light
Multiple opinions

Question 12

What to you need for laboratory communication

Answer 12

1. Planning and pt communication
2. Pre-op impression - show what there before
3. Working impression -show prep
4. Opposing impression - occlusal contact
5. Inter-occlusal record - model mounted
6. Lab card -design feature
7. Shape, shade, translucency and surface texture