Shade selection Flashcards
Why is shade so important
what is wrong with poor shade selection
- poor aesthetic outcome
- Lack of translucency around incisal edges
- Teeth may be functional
- Aesthetic failure
- Gingival inflammation around teeth, exacerbating recession
what 3 values are used to characterise the perception of light for shade selection
Divided by 3 parts based on value, hue and chroma
Value- lightness
Hue- colour
Chroma- intensity of colour
Descirbe the Vita Guide system
Variation in colour represented by hue
Chroma represented in numbers
What is Hue
Core shade of tooth
letters
what is Chroma
Numbers following letters
A3 - hue
3 represents chroma
Evaluate if you take photographs of patient
Look at intensity
Bring up saturation of colour within teeth
What is Value
What is translucency
EASILY IDENTIFY HUE
Translucency is usually forgotten with lab
Variation of translucency
Communicate and document it
Missing form shade guides
Direct retsroarions
Translucent materials
Replicate general appearance of tooth
Describe the Vita 3D Master shade guide
what are the factors that influence the shade
What is the limitation of the shade guide
what can Light be defined by
Defined by how the light hits that object
Light hits the object it can be reflected and absorbed
what determines the colour of an object
what will the light beam divert if the surface is rough
what will the light beam divert it the surface is smooth
Name the properties of teeth to consider when restoring teeth (shade selection)
Variation in translucency of teeth
Age dependant
Prior to providing any restoration
Block translucency
Not in vita shade guide
Taking photographs
Communicate translucency of teeth to lab technician
Highlight importance of surface texture
Diastemic, narrow teeth
Direct composite bonding to improve bonding and morphology of teeth
Not natural
Micro and macro anatomy
Natural light reflection and diffusion
what is the light source nad the illuminant
what two types of light do we need to distinguish between
Longer look , more likely to describe ture lightness
Cone cells are only sensitive , full colour vision
Considered as a photopic vision
what are clinical considerations for shade selection
what are the operating site lighting
describe the environments influence on shade selection
Describe the condition of the teeth on shade selection
Describe clinical tips
Take photographs with shade tabs - send to technician to evaluate
Teeth that are multichromatic
Working with direct restorations - apply direct restorative material to the tooth and assess the actual shade to the restoration
Not going to bond to the tooth
Show the patient prior to providing restoration
what other things could you consider when shade selecting
- ## Take a stump shade for crowns using a stump shade guide
