Case Study

Matisse® In Depth

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Colour matching single centrals has always been a rather difficult process to master, luckily with the  Matisse® App we have managed to reduce the difficulties in shade matching, it all starts with CIELABs color space, also referred to as “L*a*b*” which breaks down a shade into 3 values: L* for Value or Lightness and a* & b*  refers to a colour chart of the four unique colours of human vision: Red, Green, Yellow and Blue which correspond to a+, a-, b+ & b- on the colour space.

The Matisse® software measures the Delta E (standard calculation metric which correlates the human visual judgment of differences between two perceived colours.) between two images, where a value under 1.0 isn’t perceptible by the human eye, 1-2 perceptible under close scrutiny whilst anything under 3.0 is clinically acceptable as a colour match.

Colour matching single centrals has always been a rather difficult process to master, luckily with the  Matisse® App we have managed to reduce the difficulties in shade matching, it all starts with CIELABs color space, also referred to as “L*a*b*” which breaks down a shade into 3 values: L* for Value or Lightness and a* & b*  refers to a colour chart of the four unique colours of human vision: Red, Green, Yellow and Blue which correspond to a+, a-, b+ & b- on the colour space.

The  Matisse® software measures the Delta E (standard calculation metric which correlates the human visual judgment of differences between two perceived colours.) between two images, where a value under 1.0 isn’t perceptible by the human eye, 1-2 perceptible under close scrutiny whilst anything under 3.0 is clinically acceptable as a colour match.

Like most things in life, starting on the right foot is crucial!

The colour of the prep will influence the colour of the substructure, which in turn influences the ceramic, so something as simple as a stump shade will drastically improve the result of the final restoration.

The First Step!

Getting the stump shade as close to the prep is pretty simple, using Optiglaze light-cure stains we can stain up our printed model die, take a picture and match it to the prep, using the colour checker in the app we can make slight adjustments if needed.

The Next Stage

The next stage is creating a ceramic recipe. A photo is taken of the Zirconia substructure and the software calculates the mix of ceramics needed at the required thickness.

The Dentine layer of the crown is built up and fired and another picture of the reconstruction is taken to verify the fidelity of the shade match.

Once the crown is verified, a subsequent recipe is produced for the enamel and the internal effects. It is important at this stage to keep the Delta E bellow 3 during each verification photograph.

The final check!

Before sending the crown out we can do a final try-in stage without the need of having the patient beside us, here we can judge if our crown will be clinically acceptable before it even leaves the lab.

When working with non-polarised images, its important to select areas without reflection on the tooth surface.

Conclusion

Matisse® improves the effectiveness of the restoration process by minimising in-office appointments and streamlining the shade selection procedures, while enhancing the overall excellence and accuracy of premium dental crown and bridge solutions, ultimately benefiting patients.

The dental laboratory, client, and patient were all very happy with the resuls for this single central.