Method for accurately preparing the color of a dental restoration
First Claim
1. A color system for porcelain dental restorations, comprising:
- a set of powders comprising a plurality of powders, wherein individual powders have a color component difference which is equidistant for hue, chroma, and value when plotted on a polar co-ordinate graph of color space, and wherein at least two of said powders can be utilized to adjust a single color component of hue, chroma, value, or translucency, without affecting another of said color components.
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Abstract
The present invention relates to a method for preparing the color of a dental restoration using a spectrophotometer and a unique color system for porcelain dental restorations which enables a dentist or technician to manipulate the various color components of the porcelain, hue, chroma, value, and translucency, independently. Color component deltas between consecutive colors in the powder sets are equidistant, with the difference in values being linear in color space. This enables simplified, exact matching of a specified color component value. The method comprises illuminating an abutting tooth with light, gathering reflected light, converting the gathered light to analog signals, correct for ambient light interference, translucency effects (if necessary) and varying illumination, using the result to obtain accurate color component values, and employing those values to chose and, where necessary, mix the appropriate powers to obtain the correct color porcelain for the desired dental restoration.
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Citations
25 Claims
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1. A color system for porcelain dental restorations, comprising:
a set of powders comprising a plurality of powders, wherein individual powders have a color component difference which is equidistant for hue, chroma, and value when plotted on a polar co-ordinate graph of color space, and wherein at least two of said powders can be utilized to adjust a single color component of hue, chroma, value, or translucency, without affecting another of said color components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A color system for porcelain dental restorations, comprising:
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a set of powders comprising a plurality of powders, wherein at least one powder has approximately the lowest combination of hue and chroma found in greater than 95% of human teeth at a first translucency level; and a second subset of colors comprising a red modifier and a yellow modifier. - View Dependent Claims (21, 22)
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23. A method for forming a powder to be used in making a dental restoration, comprising:
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a. using a spectrophotometer to determine a desired color having the color components of translucency, hue, value, and chroma; b. choosing, among a set of powders comprising a plurality of powders, wherein individual powders are equidistant in a polar co-ordinate color space, and wherein two of said powders can be utilized to adjust a single color component, hue, chroma, value, or translucency, without affecting another of said color components, the powders which have the closest color components to said desired color components, wherein at least one of said powders has one color component value greater than said desired color component value and another of said powders has the same color component value less than said desired color component value; and c. combining two of said chosen powders at an appropriate ratio to obtain a combined powder having said desired color component values. - View Dependent Claims (24, 25)
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Specification