Abstract
This study aimed to develop a three-dimensional (3D) colour reproduction system to improve the aesthetic effects of dental prostheses. The system’s colour accuracy was also evaluated. Based on the concept of colour management, 96 colour patches were selected to develop colour profiles for an intraoral scanner and a 3D printer using polynomial regression. The colour differences Δ{E}_{ab}^{ast } between colour patches reproduced using different colour profiles and the original colour patches were analysed to select the best combinations of colour profiles. The 3D colour reproduction system with the best-performing (i.e. third-order polynomial regression) colour profiles was finally evaluated using tooth and gum shades. The median Δ{E}_{ab}^{ast } was 6.940 ranging from 1.504 to 32.660. In terms of tooth and gum shade, the median Δ{E}_{ab}^{ast } was 6.313, and half of the shade blocks were above the mismatch threshold (Δ{E}_{ab}^{ast } > 6.80). In conclusion, the colour management based on polynomial regression can decrease the colour difference of the 3D colour reproduction system, but not to clinically acceptable levels. Further advances are needed to improve the methods and hardware.
Highlights
This study aimed to develop a three-dimensional (3D) colour reproduction system to improve the aesthetic effects of dental prostheses
Colour management concepts are required to develop a conversion between the colour spaces, and so allow a 3D colour reproduction system to produce chromatic dental models with colours visibly perceived to be accurate
The adjusted R-squares and plots show both scanner colour profiles achieved good performance, whereas the cubic polynomial achieved better fitting for the printer colour profile than the quadratic polynomial
Summary
This study aimed to develop a three-dimensional (3D) colour reproduction system to improve the aesthetic effects of dental prostheses. The measuring and transferring of intraoral colour information are fundamental to achieve perfect mimicry of the natural teeth and the surrounding tissue, which is essential for aesthetic restorations In digital dentistry, these processes are still limited by traditional methods. A frequently used example is visual shading using shading guides This is a subjective process and lacks accuracy in certain situations, as many factors can affect its results such as ambient illumination, the patient’s make-up, and the dentist’s colour perception. Another method is digital shading by a digital shading instrument, which is objective and quicker[1,2,3] than conventional visual shading. Colour management concepts are required to develop a conversion between the colour spaces, and so allow a 3D colour reproduction system to produce chromatic dental models with colours visibly perceived to be accurate
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