What is the appropriate illumination for an official engaged in oral aesthetics colorimetric work?

Due to the complexity of natural tooth color, accurate clinical color comparison is not easy. Clinical visual colorimetry is influenced by many subjective and objective factors.

0 1, light source

Light source is one of the most important factors affecting visual colorimetry [18]. Generally, dental color measurement is carried out under natural light, and some cloudy sunny days have better natural light, and the suitable time is 10:00 ~ 2: 00 pm, but the spectral distribution of sunlight varies greatly with the cloud cover, season, phase and place in the sky. Therefore, developing a light source suitable for dental colorimetry can make up for the shortage of natural light.

The change of natural light from morning till night (picture from the Internet)

Whether the light source is suitable for colorimetry should be evaluated from three aspects: color temperature, color rendering index and light intensity.

The concept of color temperature can properly describe the color of light, with high color temperature and many components of blue and green light; When the color temperature is low, there are more components of orange light and red light. In order to ensure the balance of each component of the light source spectrum, the color temperature of the colorimetric light source should be stable at 5500-6500 K [19];

Colorimetry under different color temperature light sources

The influence of light source on the color appearance of objects is called color rendering, and the color rendering of light source is determined by the spectral distribution of light source. Light sources with continuous spectral distribution have good color rendering, such as sunlight and incandescent lamps. It should be noted that there is no necessary relationship between the color temperature of the light source and its color rendering. Light sources with different spectral distributions may have the same color temperature, but their color rendering may be very different.