CDC Shade Matching & Color Science Flashcards
6 cards from real CDC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CDC Shade Matching & Color Science flashcards as text
The VITA 3D-MASTER shade guide organizes shades primarily by which dimension first?
Answer: Value (lightness)
The 3D-MASTER system first selects the value group (1 through 5, lightest to darkest), then chroma, then hue, giving a systematic three-dimensional approach to shade selection.
Which color theory principle explains why a gray ceramic crown placed next to a yellow-toned tooth will appear slightly bluish?
Answer: Simultaneous color contrast
Simultaneous color contrast occurs when an object appears shifted toward the complementary color of its surroundings — gray next to yellow appears slightly blue because blue is yellow's complement.
Approximately what percentage of the US male population has some degree of red-green color vision deficiency relevant to shade matching?
Answer: Approximately 8 percent
About 8% of males and 0.5% of females have red-green color vision deficiency, making objective spectrophotometric shade measurement tools especially important in laboratory settings.
A spectrophotometer used in dental ceramics measures which property to provide an objective shade reading?
Answer: The spectral reflectance curve of the tooth or ceramic at multiple wavelengths
A dental spectrophotometer measures the percentage of light reflected at each wavelength across the visible spectrum, providing objective data translatable into shade guide values.
When layering enamel porcelain over dentin porcelain, which principle guides the ceramist's choice of enamel opacity?
Answer: More translucent enamel allows more dentin color to show through, enriching the final shade
Translucent enamel layers transmit and scatter light down to the dentin, so the final visual shade is a combination of both layers; the ceramist controls this balance to achieve the prescribed shade.
Which environmental factor in the dental laboratory most commonly causes unintended color shift when evaluating ceramic shade under mixed lighting?
Answer: Colored walls or surfaces in the lab that cast a reflected tint onto the restoration
Brightly colored walls, countertops, or clothing reflect colored light onto the ceramic, contaminating the shade evaluation and causing the ceramist to miscorrect.