RESUMO
Radiologists may encounter patients with fixed dental prostheses that may produce image distortion on MRI scans of the face and jaw. In this work, we assessed the MRI appearances of dental prosthetic materials in vitro, including precious alloys, nonprecious alloys, ceramic prostheses, dental amalgam, and composite materials. For in vivo studies, these materials were placed in the patient's mouth. Nonprecious alloys produce large image deformations, whereas precious alloys had no effect on MRI images. The in vivo study showed the anatomical zones that were most affected on MRI scans. The size of these zones produced by the presence of nonprecious alloys is influenced by the volume of the prosthesis and is related to the scanning sequence used.
Assuntos
Materiais Dentários , Dentaduras , Imageamento por Ressonância Magnética , Adulto , Cerâmica , Ligas Dentárias , Amálgama Dentário , Cabeça/anatomia & histologia , Humanos , Técnicas In VitroAssuntos
Ligas Dentárias , Materiais Biocompatíveis , Fenômenos Químicos , Físico-Química , Corrosão , EletroquímicaRESUMO
The use of a silicone base under a total prosthesis makes possible the solution of certain problems of tolerance or maintenance of such denture. I.--Full denture in patients who have received radiotherapy. II.--Full denture with intolerant mucosa. III.--Following failure of classical prosthesis. IV--Prosthesis fitted following pre-prosthetic surgery. The technical problems associated with the fabrication of such prosthesis and possible adjustements are discussed.
