U.S. Air Force Senior Airman Meghan Mayhew, a dental lab technician with the 628th Medical Group, polishes a gold crown at the Joint Base Charleston dental lab in South Carolina Sept. 22, 2011. Dental lab technicians fabricate retainers, maxillary and mandibular expanders, molds for pilots' custom flight masks, sports guards, night guards, crowns, bridges and dental implants.