Fundamentals of Digital Dental Photography

Vocabulary terms covering exposure control, flash systems, shade selection, and specialized dental photography techniques based on the lecture transcript.

Shutter Speed

A setting that indicates how fast the camera shutter closes, controlling the duration of light exposure and the ability to freeze motion.

Aperture

The opening through which light travels in a lens, similar to the pupil of the eye, which controls the light via a small hole.

ISO

A setting that determines the sensitivity of the camera sensor to light; in dentistry, a low setting like 100 or 200 is preferred for better quality.

Depth of Field

The distance between the nearest and farthest objects that remain in focus; a deep depth of field is required in clinical photography to see all teeth clearly.

F-stop

The numerical measurement used for the aperture; a high value like $f/32$ or $f/45$ provides the deep depth of field necessary for dental views.

Ring Flash

An external light source positioned directly in front of the lens that provides good illumination but can make dental objects appear flat.

Twin Flash

A flash system with light sources coming from two different directions, allowing for creative lighting and better texture in dental images.

Histogram

A graphic representation displayed after taking a photo that helps a clinician evaluate the exposure and light balance.

Microfiber

The recommended material for cleaning high-quality dental mirrors to prevent surface scratches caused by abrasive items like paper towels.

Dehydration

The process by which a tooth loses moisture upon exposure to air, causing it to change value and appearance within minutes.

Kelvin ($K$)

The unit used to measure color temperature; for dental offices, daylight-corrected light should be between $5,000\,K$ and $5,500\,K$.

Value

The first dimension determined in shade selection that refers to the brightness or lightness of the tooth.

Chroma

The dimension of color that indicates the intensity or saturation of the hue.

Hue

The specific color classification, represented in the three-dimensional shade guide by M (orange), L (yellow), and R (red).

Gray Card

An 18% neutral gray reference tool used to calibrate colors in photo editing programs so the monitor displays the true color of the patient's teeth.

Cross Polarization

A technique using polarizing films at a 90-degree angle to remove glare and reflections, allowing the underlying structure and color of the tooth to be visible.

Mock-up

A clinical procedure where a wax-up is transferred to the patient's mouth using temporary material to provide a preview of the final aesthetic result.

Stump Shade

The color of the prepared natural tooth structure, which must be documented so the lab can adjust for the translucency of the final restoration.