225 ILCS 25/49

(a) Every complete upper and lower denture and removable dental prosthesis fabricated by a dentist, or fabricated pursuant to a dentist's prescription, shall be marked with the name of the patient for whom the prosthesis is intended. The markings shall be done during fabrication and shall be permanent, legible and cosmetically acceptable. The exact location of the markings and the methods used to apply or implant them shall be determined by the dentist or dental laboratory fabricating the prosthesis. If in the professional judgment of the dentist, this full identification is not possible, the name may be omitted. (b) Any removable dental prosthesis in existence which was not marked in accordance with paragraph (a) of this Section at the time of fabrication, shall be so marked at the time of any subsequent rebasing or duplication.