EUGENIA EFTIMIE TOTU, AURELIA CRISTINA NECHIFOR, GEORGE VALASCEANU, ANA MARIA JOSCEANU, CORINA MARILENA CRISTACHE ON PHYSICAL AND CHEMICAL CHARACTERISTICS OF POLY (METHYL METHACRYLATE)NANOCOMPOSITES FOR DENTAL APPLICATIONS. II The ionic conductivity, ionic viscosity as intrinsic properties of PMMA - TiO2 nanocomposites were investigated. The PMMA doped with 0.4% TiO2 nanoparticles has been used for 3D printed dentures manufacturing. A structural characterization using micro-computer tomography method was performed on 3D printed dentures, which have been permanently used for 12 months. The obtained results revealed good morphological stability of the materials in vivo, in the oral environment. The reinforced polymer matrix with nanotitania particles showed a dielectric constant and conductivity dependent on frequency, exhibiting improved characteristics when compared to the pure polymer matrix.