Technology and medicine become more integrated with each passing day. Currently, scientists are on the cusp of creating human organs with 3-D printers and using mechanized devises to replicate the functions of the human heart. Dentistry is also experiencing these rapid advancements thanks to new technologies as well. Ron Hill, 21st Space Wing Area Dental Lab certified dental technician, said that while many procedures today still rely on hand-made impressions to build dental appliances, technology is quickly changing this process. Hill began his career in dentistry while serving as a fixed prosthetic technician in the Army during the Vietnam War. He continued in this field from 1973-1989 with his own private dental appliance practice until he joined the Air Force as a civilian in 1998. According to Hill, many dental appliances — such as bridges or crowns — are still manufactured by hand. This process begins by molding an impression of a patient’s dental arch after which technicians at a base’s dental clinic create a positive cast from the impression.