| 摘要 |
A method of determining the colour of teeth comprises providing a lip spreader 2 with an integral colour chart 1 positioned on the lip spreader 2, wherein the colour chart 1 comprises at least three different colours 5-13 with known characteristics; using the lip spreader 2 to expose a patient's teeth 4; by virtue of the integral colour chart 1, locating the colour chart 1 at a predetermined position relative to the teeth 4; capturing a digital image of the colour chart 1 and teeth 4 of interest, the digital image hence including image colours for the teeth 4 and image colours for the colour chart 1; electronically processing the digital image using the image colour for a selected tooth or tooth area, the image colours for the colour chart 1, and the known characteristics of the actual colours 5-13 of the colour chart 1; and thereby determining the actual colour of the selected tooth or tooth area. |
