Sierra Aguilar, a U.S. Air Force 19th Aerospace Medicine Squadron dental laboratory technician, casts impressions to create 3-D models for patients July 27, 2016, at Little Rock Air Force Base, Ark. Cast impressions are used for diagnostics, treatment planning, and fabrication of custom trays, dentures, crowns and orthodontics. (U.S. Air Force photo/Senior Airman Harry Brexel)