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

1. Mark Oborn RDT LBIDST Of all the things I’ve lost in life , the things I miss the most are my marbles

2. Shade Matching Subjectivity to Objectivity

5. Colour doesn’t exist It is merely our brains interpretation of a series of effects and actions placed on a particular wavelength of light

14. Reflection Transmission Interference Dispersion 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

15. We all also have preconceptions Picture a summers day?

16. Did your picture look anything like either of these?

17. Now picture the colour Orange?

18. Which shade of orange did you picture?

19. 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?

21. OSRAM TABLE OSRAM 965 is one of the best light bulbs to help overcome this

23. There are many depths of colour on a tooth

24. Dentine Colour Dentine Effects Enamel Colours Surface Effects

25. We try to match this with a crown, these are some of the colours we would use at different depths to get a C3

26. A3 Dark stain D2 White banding Feint orange flecks Translucent incisal This is how shades often are drawn by dentists and technicians alike

27. Dentine Colour Dentine Effects Enamel Colours Surface Effects But where do these colours all go? AT what depth?

28. 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.

29. 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

30. This is how I do it

35. Images from digital systems

37. 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!

38. Use Contrastors for photos General Medical

39. With black contrasters the incisal architecture is easier to see

41. Photos to take Full arch in ICP

43. Photos to take Single tooth, Teeth apart

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

45. Photos to take Lingual

46. This shows us how to map the incisal colours

47. Photos to take With shade tab

48. This gives the lab an idea of gradation of colour against a standard

49. Modify the image properties. Increase contrast and decrease brightness

50. The various effects then stand out which makes mapping easier

51. SBO Dental Laboratory 01707 663293 www.sbodentallaboratory.co.uk Precision meets Art Thank you for your attention