TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Dental impression. Dentist taking an impression of a young patient's teeth. The teeth of the upper jaw are being pressed into a dental tray (red) containing a soft plasticine- like material called alginate (green). This will harden, producing a negative impression. High- grade cement can then be poured into the mould to create a positive model of the patient's teeth.
Model release not required. Property release not required.