Abstract
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.
Highlights
Despite of the tremendous progresses registered in dental materials and technologies, poly (PMMA) remain the most widely used material in removable prosthodontics
Before recommending nanotitania as additive to PMMA in standard procedures for complete denture manufacturing, studies regarding the structural stability over time in oral environment, are still needed
We note that the bulk ionic conductivity decreases, and in same time the ion viscosity increases with the increase of the exposure time
Summary
Despite of the tremendous progresses registered in dental materials and technologies, poly (methyl methacrylate) (PMMA) remain the most widely used material in removable prosthodontics. Some of the drawbacks of the polymeric material used for complete dentures manufacturing were addressed lately by adding nano-fillers, either nanoparticles or nanotubes, or by utilizing new emerging technologies such as rapid prototyping or milling by computer numeric control (CNC). Several improvements are needed for providing long term stability of polymer structure, especially by adding important characteristics such as antibacterial properties [6,7]. Before recommending nanotitania as additive to PMMA in standard procedures for complete denture manufacturing, studies regarding the structural stability over time in oral environment, are still needed. The aim of the present paper was to assess the structural characteristics of the 3D printed dentures based on months of PcMonMtAinudooupsedwewairtihngT.iOIn2 nanoparticles after addition, there will 12 be presented a correlation of the specific parameters: ionic viscosity, permeability loss, impedance, ionic conductivity and viscosity for the PMMA-TiO2 nanocomposite. The polymeric solution and the corresponding nanotitania (0.4% w/w) have been sonicated in the ultra-sonication bath for 40 min for obtaining homogeneous PMMA nanocomposite according to the procedure introduced elsewhere [13]
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