Michigan Compiled Laws, Chapter 333. Health § 333.16642

Sec. 16642. (1) A written authorization for dental laboratory work shall be in a form prescribed by the board and shall contain the following:

(2) A dental laboratory shall return completed prescribed work to the prescribing dentist or the dentist's office with the name or number of the written work authorization accompanying the invoice.

(3) A dental laboratory shall not have in its possession a prosthetic denture, bridge, orthodontic or other appliance, or structure to be used as a substitute for or as a part of human teeth or jaws or associated structures or for the correction of malocclusions or deformities, completed or being fabricated without having in its possession a written work authorization therefor.