The dentist who signs a work authorization shall: Send the original to the dental laboratory named on the work authorization; and Keep the copy. The dental laboratory named in the original work authorization shall: Send the original of a subcontracted work authorization to the dental laboratory that is to do the subcontracted work; and Keep the copy. The person who keeps or receives the original or copy of a work authorization or subcontracted work authorization shall keep it for at least 1 year. If a subcontracted work authorization is issued, the dental laboratory named in the original work authorization shall attach the original work authorization form to the copy of the subcontracted work authorization form and keep the two together in the files of the dental laboratory for at least 1 year. If a dentist uses a patient identification number instead of a name on a work authorization, the dentist shall keep in the dentist’s office a cross reference that translates the number to the name of the specific patient.