taking shades for dentists
DESCRIPTION
A presentation looking at the problems with shade taking and some ideas on how to overcome themTRANSCRIPT
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Mark Oborn RDT
LBIDST
Of all the things I’ve lost
in life, the things I miss the most are my marbles
Shade Matching
Subjectivity to Objectivity
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
We will look at…
Colour Theory Understanding how a crown is built Computer assisted shade analysis Practical techniques.
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
We will look at…
Colour Theory Understanding how a crown is built Computer assisted shade analysis Practical techniques
Colour doesn’t exist
It is merely our brains interpretation of a series of effects and actions placed on a particular wavelength of light
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Colour is affected by…
Reflection Transmission Interference Dispersion Scattering
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Reflection
Some frequencies of light are reflected while some are absorbed
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Transmission
Some frequencies of light are transmitted through the tooth while others are absorbed
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Interference
certain frequencies are amplified while others are disrupted
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Dispersion
The separation of a polychromatic light wave
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Scattering
the redirection of certain frequencies of light striking small particles
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Summary
Reflection – Some frequencies of light are reflected while some are absorbed
Transmission - Some frequencies of light are transmitted through the tooth while others are absorbed
Interference - certain frequencies are amplified while others are disrupted
Dispersion - the separation of a polychromatic light wave
Scattering - the redirection of certain frequencies of light striking small particles.
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
This means that…
One needs to take in to account these effects on a tooth when looking at colour. Otherwise you may THINK you see a colour, but really it is the effects of the interplay of reflection, transmission, dispertion, interferance and scattering.
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293ReflectionTransmissionInterferenceDispersion Scattering
Look at the water in this scene. We know water is a
colourless liquid, yet due to these effects it looks
everything from black to white and all shades of blue
in this photo
We all also have preconceptions
Picture a summers day?
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293Did your picture look anything like either of these?
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Now picture the colour Orange?
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293Which shade of orange did you picture?
The Effects of the Gingiva
Look at the dot in the centre, depending on the surrounding colour, the yellow bar at each end looks
slightly different. Which is most representative?
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Lighting prerequisites for the surgery to help overcome these problems
5500-6500K (D65 light source) Ra (Colour rendering index) >95 – 1A
International scale
OSRAM TABLEOSRAM 965 is one of the best light bulbs to help overcome this
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
We will look at…
Colour Theory Understanding how a crown is built Computer assisted shade analysis Practical techniques
There are many depths of colour on a tooth
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Dentine Colour
Dentine Effects
Enamel Colours
Surface Effects
We try to match this with a crown, these are some of the colours we would use at different depths to
get a C3
A3
Dark stain
D2
White banding
Feint orange flecks
Translucent incisal
This is how shades often are drawn by dentists and technicians alike
Dentine Colour
Dentine Effects
Enamel Colours
Surface Effects
But where do these colours all go? AT what depth?
A3 dentine
White band on dentine
D2 Dentine
I recommend breaking the tooth down in to
layers, look deep within the tooth. Then map it
the DENTINE only.
Orange Enamel
TOS10G
Enamel TOS58
Opalescent blue TOS10B
Surface stain neck and body white striations
Next map the ENAMEL only, this avoids too much information on the prescription and gives us a 3D map of
where to build the colours
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
This is how I do it
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
Images from digital systems
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293
We will look at…
Colour Theory Understanding how a crown is built Computer assisted shade analysis Practical techniques
Communication must be taken seriously. Each person can interpret the last person
differently with disasterous results
Patient wants
Dentist says
Technician hears
“I want perfect teeth”
“Make the teeth white, symmetrical, straight and in line”
Oops a disasterous case!
Use Contrastors for photos
General Medical
With black contrasters the incisal architecture is easier to
see
Photos to take
Full arch in ICP
Photos to take
Single tooth, Teeth apart
Notice how different the tooth looks when open and closed, take both images
Photos to take
Lingual
This shows us how to map the incisal colours
Photos to take
With shade tab
Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd
01707 663293This gives the lab an idea of gradation of colour against a standard
Modify the image properties. Increase contrast and decrease brightness
The various effects then stand out which makes mapping easier
SBO Dental Laboratory
01707 663293
www.sbodentallaboratory.co.uk
Precision meets Art
Thank you for your attention