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

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