Related Experiment Video
Updated: Aug 15, 2026
10:18
Blue-hazard-free Candlelight OLED
Published on: March 19, 2017
Brightness (value) sequence for the Vita Lumin Classic shade guide reassessed
Kit-Yee Lee1, Derrick Setchell, Alastair Stokes
1Paramount Mansion, Hurghom, Kowloon, Hong Kong. lennislee@gmail.com
The European Journal of Prosthodontics and Restorative Dentistry
|September 27, 2005
Summary
This study mapped Vita Lumin 'Classic' shade tabs using Photoshop
Area of Science:
- Dental materials science
- Color science
- Digital imaging
Background:
- The Vita Lumin 'Classic' shade guide is widely used in dentistry.
- Accurate shade matching is crucial for aesthetic restorations.
- Existing shade guides may lack precise quantitative color data.
Purpose of the Study:
- To quantitatively analyze the 16 shade tabs of the Vita Lumin 'Classic' guide.
- To determine the position of each shade tab within the RGB and Luminosity color scales.
- To propose a more linear and accurate method for ordering dental shade tabs.
Main Methods:
- Utilized Adobe Photoshop software for quantitative color analysis.
- Assigned numerical values (0-255) for Luminosity, Red, Green, and Blue (RGB) components to each shade tab.
- Reordered shade tabs based on the derived quantitative values.
Main Results:
- Established quantitative Luminosity, R, G, and B values for all 16 Vita Lumin 'Classic' shade tabs.
- A new shade tab order based on Photoshop values showed a more linear progression than the manufacturer's order.
- Introduced a 'Brightness Index' for a more realistic assessment of shade tab value differences.
Conclusions:
- Photoshop's quantitative color scales provide a more objective method for analyzing dental shade tabs.
- The proposed reordering and Brightness Index offer improved accuracy for shade tab comparisons.
- This approach can enhance precision in dental shade selection and communication.
Related Concept Videos
01:24Color Vision
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
01:16Flame Photometry: Lab
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
01:14Changes in Skin Color: Clinical Perspectives
The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
02:00Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
00:53Sound Intensity Level
Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...