taking shades for dentists

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Mark Oborn MBA LBIDST SBO 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

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A presentation looking at the problems with shade taking and some ideas on how to overcome them

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Page 1: Taking shades for dentists

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

Page 2: Taking shades for dentists

Shade Matching

Subjectivity to Objectivity

Page 3: Taking shades for dentists

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.

Page 4: Taking shades for dentists

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

Page 5: Taking shades for dentists

Colour doesn’t exist

It is merely our brains interpretation of a series of effects and actions placed on a particular wavelength of light

Page 6: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Colour is affected by…

Reflection Transmission Interference Dispersion Scattering

Page 7: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Reflection

Some frequencies of light are reflected while some are absorbed

Page 8: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Transmission

Some frequencies of light are transmitted through the tooth while others are absorbed

Page 9: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Interference

certain frequencies are amplified while others are disrupted

Page 10: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Dispersion

The separation of a polychromatic light wave

Page 11: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Scattering

the redirection of certain frequencies of light striking small particles

Page 12: Taking shades for dentists

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.

Page 13: Taking shades for dentists

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.

Page 14: Taking shades for dentists

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

Page 15: Taking shades for dentists

We all also have preconceptions

Picture a summers day?

Page 16: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293Did your picture look anything like either of these?

Page 17: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Now picture the colour Orange?

Page 18: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293Which shade of orange did you picture?

Page 19: Taking shades for dentists

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?

Page 20: Taking shades for dentists

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

Page 21: Taking shades for dentists

OSRAM TABLEOSRAM 965 is one of the best light bulbs to help overcome this

Page 22: Taking shades for dentists

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

Page 23: Taking shades for dentists

There are many depths of colour on a tooth

Page 24: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Dentine Colour

Dentine Effects

Enamel Colours

Surface Effects

Page 25: Taking shades for dentists

We try to match this with a crown, these are some of the colours we would use at different depths to

get a C3

Page 26: Taking shades for dentists

A3

Dark stain

D2

White banding

Feint orange flecks

Translucent incisal

This is how shades often are drawn by dentists and technicians alike

Page 27: Taking shades for dentists

Dentine Colour

Dentine Effects

Enamel Colours

Surface Effects

But where do these colours all go? AT what depth?

Page 28: Taking shades for dentists

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.

Page 29: Taking shades for dentists

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

Page 30: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

This is how I do it

Page 31: Taking shades for dentists
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Page 35: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293

Images from digital systems

Page 36: Taking shades for dentists

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

Page 37: Taking shades for dentists

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!

Page 38: Taking shades for dentists

Use Contrastors for photos

General Medical

Page 39: Taking shades for dentists

With black contrasters the incisal architecture is easier to

see

Page 40: Taking shades for dentists
Page 41: Taking shades for dentists

Photos to take

Full arch in ICP

Page 42: Taking shades for dentists
Page 43: Taking shades for dentists

Photos to take

Single tooth, Teeth apart

Page 44: Taking shades for dentists

Notice how different the tooth looks when open and closed, take both images

Page 45: Taking shades for dentists

Photos to take

Lingual

Page 46: Taking shades for dentists

This shows us how to map the incisal colours

Page 47: Taking shades for dentists

Photos to take

With shade tab

Page 48: Taking shades for dentists

Mark Oborn MBA LBIDSTSBO Dental Laboratory Ltd

01707 663293This gives the lab an idea of gradation of colour against a standard

Page 49: Taking shades for dentists

Modify the image properties. Increase contrast and decrease brightness

Page 50: Taking shades for dentists

The various effects then stand out which makes mapping easier

Page 51: Taking shades for dentists

SBO Dental Laboratory

01707 663293

www.sbodentallaboratory.co.uk

Precision meets Art

Thank you for your attention