Poly(methyl metacrylate) Nanocomposites for Two-piece CAD/CAM Solution as an Alternative to Monolithic Removable Prosthesis

Pantazi, Aida; Totu, Eugenia Eftimie; Dorobantu, Dorel; Cristache, Corina Marilena; Enăchescu, Marius

doi:10.37358/mp.18.4.5091

Cited by 9 publications

(6 citation statements)

References 9 publications

(19 reference statements)

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“…The morphology of the nanocomposite which has been completed with FT-IR and Raman spectroscopy analysis [13,16], putting in evidence the presence of the specific functional groups [22,23], supports the conclusion that the obtained nanocomposite material could be successfully use for 3D printing technique.…”

Section: Resultsmentioning

confidence: 68%

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Nanocomposite for Rapid Prototyped Complete Denture Eighteen months follow-up on clinical performance

Cristache¹,

Totu²,

Grosu³

et al. 2019

Rev. Chim.

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The aim of the present study was to evidence the improved behavior of our modified PMMA-TiO2 nanocomposite material used to obtain 3D printed complete dentures. A protocol for long-term rapid prototyping complete denture manufacturing using our nanocomposite material, completely characterized and the evaluation of the clinical performance and complications after eighteen months of continuous wearing was also described. Thirty-five fully edentulous patients were enrolled in this prospective clinical study and forty-five complete dentures (31 maxillary and 14 mandibular) have been obtained using an additive manufacturing technology. Due to the good performances of the nanocomposite material, no major functional complications for the obtained medical devices occurred and the clinical outcomes for the 3D printed dentures were favorable evaluated at eighteen months follow up.

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Section: Resultsmentioning

confidence: 68%

“…A 0.4% TiO 2 -poly(methyl methacrylate) nanocomposite has been obtained. It exhibits good biocompatibility [14,22] and excellent structural, electrical, thermal and specific performances [16][17][18].…”

Section: Resultsmentioning

confidence: 99%

Nanocomposite for Rapid Prototyped Complete Denture Eighteen months follow-up on clinical performance

Cristache¹,

Totu²,

Grosu³

et al. 2019

Rev. Chim.

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“…For the polymeric materials used in dentistry, the performance requirements are tailored for their specific applications, but the fundamental principle of biomaterials is consistent: appropriate biomechanical properties, reduced volumetric changes, coupled with excellent biocompatibility and biological safety, the chemical structure of the polymer determining its properties, and the properties being closely related to their clinical applications [37][38][39][40][41].…”

Section: Discussionmentioning

confidence: 99%

Dimensional Accuracy of Digitalized Stone Models Obtained from Alginic Acid Polymer and Poly-dimethyl-siloxane Impressions

Oancea¹,

Cristache²,

Petre³

et al. 2020

Mater. Plast.

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The prognosis of the prosthetic rehabilitation is linked to the proper transfer of the clinical data to the dental laboratory, in the digital or conventional workflow. The aim of the present study was to compare the dimensional accuracy of analog and digitalized models, focusing on the influence of impression polymeric materials on the final digital model. Methods: The master model with standard reference points and the three groups of test models, obtained by alginic acid polymer impression (group A) and condensation-cured poly(dimethyl siloxane) in two impression techniques (1-step putty/light-body-group 1T, 2-steps putty/ light-body-group 2T), were measured in four standardized points before and after digitization. The differences from the master model and between the pair analog and digital models was calculated and statistically analysed using Mann-Whitney tests (2 groups), and one-way Anova (3 groups) with post-hoc Tukey s Test was applied for pairwise analysis (a;=0.05). Results: All analog and digitalized model tests showed altered dimensions from the master model. A general reduction of the digitalized models, in sagittal and transversal dimensions, was observed, comparing to the reference model. The impression material was a significant factor influencing dimensional accuracy. Conclusions: a statistically significant difference was found between most of the models and the master model. However, through digitalization, some of the errors were compensated. The digital models from alginic acid polymer group (group A) registered the highest trueness, with no statistically significant difference (P]0.05) from the reference model.

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“…Taking into account the specific procedure proposed for nanotitania grafting onto silica microfibers, it is of interest to determine the dimensions of the crystalline nanoparticles. The average size (nm) of nano TiO 2 crystallites (D) was estimated through the known Scherrer equation 56 where λ = 0.15406 nm is the X-ray wavelength of the incident radiation, β stands for the full width at half maximum expressed in radians ( (deg ) 180 β = . ⋅ π ), θ is the angle between the diffracted and incident beams (Bragg's angle of diffraction), considering the Scherrer constant 0.94 that is specific for spherical particles with cubic symmetry 57 .…”

Section: Methodsmentioning

confidence: 99%

Added value recyclability of glass fiber waste as photo-oxidation catalyst for toxic cytostatic micropollutants

Nechifor

Totu

Nechifor

et al. 2020

Sci Rep

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There is an increased interest in recycling valuable waste materials for usage in procedures with high added values. Silica microparticles are involved in the processes of catalysis, separation, immobilization of complexants, biologically active compounds, and different nanospecies, responding to restrictive requirements for selectivity of various chemical and biochemical processes. This paper presents the surface modification of accessible and dimensionally controlled recycled silica microfiber with titanium dioxide. Strong base species in organic solvents: methoxide, ethoxide, propoxide, and potassium butoxide in corresponding alcohol, activated the glass microfibres with 12-13 µm diameter. In the photo-oxidation process of a toxic micro-pollutant, cyclophosphamide, the new composite material successfully proved photocatalytic effectiveness. The present work fulfills simultaneously two specific objectives related to the efforts directed towards a sustainable environment and circular economy: recycling of optical glass microfibers resulted as waste from the industry, and their usage for the photooxidation of highly toxic emerging micro-pollutants. Inorganic-inorganic oxide-type composite materials offer the most interesting technical solutions in many physicochemical processes of bio-degradation, coating, separation, or catalysis 1,2. A particular case is presented by the silicon dioxide-titanium dioxide (TiO 2-SiO 2) composites that combine the distinctive characteristics of the two oxides. Thus, silicon dioxide is a technically-economically accessible material and can be made in the form of spherical particles 3 , nanofibers 4 , nanotubes 5 , or films 6 , thus being used as an active material, adsorbent or support for other materials with higher selectivity 7. Titanium dioxide prepared in predetermined forms: spheres 8 , nanotubes 9 , nano-threads 10 , or films 11 could be used as an adsorbent or covering, but especially like catalytic material 12. Of course, the combination of the two oxides' properties has been used for the most advanced applications: photocatalytic degradation of organic/pharmaceutical pollutants 13 , fuel cells 14 , membrane reactors 15 , bioreactors 16 , advanced separations 17 and clinical devices 18. Environmental researches proved that the widely used cytostatic drug, N, N-bis(2-chloroethyl)-1,3,2-oxazaphosphinan-2-amine 2-oxide known as cyclophosphamide, which is a cyclic amide, produces residues with mutagenic action. Although mainly known as an anticancer drug, cyclophosphamide is also administrated frequently as an anti-inflammatory or immunolytic agent for rheumatoid arthritis 19 , or nephrotic syndrome 20 , systemic lupus erythematosus 21 , or systemic sclerosis lung fibrosis 22. This important cytostatic compound administrated for autoimmune diseases, and cancer chemotherapy, as well as its metabolites, are released into effluents that reach surface and ground waters 23. The cyclophosphamide action through nucleophilic compounds' alkylation and metabolic activation result in dra...

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Poly(methyl metacrylate) Nanocomposites for Two-piece CAD/CAM Solution as an Alternative to Monolithic Removable Prosthesis

Cited by 9 publications

References 9 publications

Nanocomposite for Rapid Prototyped Complete Denture Eighteen months follow-up on clinical performance

Nanocomposite for Rapid Prototyped Complete Denture Eighteen months follow-up on clinical performance

Dimensional Accuracy of Digitalized Stone Models Obtained from Alginic Acid Polymer and Poly-dimethyl-siloxane Impressions

Added value recyclability of glass fiber waste as photo-oxidation catalyst for toxic cytostatic micropollutants

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