Nano-structured hydroxyapatite and titanium dioxide enriching PENTA /UDMA adhesive as aesthetic coating for tooth enamel |
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| Authors: | Alfredo Nevarez-Rascón Abel Hurtado-Macías Hilda Esperanza Esparza-Ponce Martina Margarita Nevarez-Rascón Jesús González-Hernández Miguel José Yacamán |
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| Institution: | 1. Department of Research and Graduatedepartment. Facultad de Odontología, Universidad Autónoma de Chihuahua, Pascual Orozco y Avenida Universidad s/n C.P, 31000 Chihuahua. Chihuahua. Mexico;2. Department of Metallurgy and Structural Integrity, National Nanotechnology Laboratory Centro de Investigación en Materiales Avanzados S.C, Chihuahua, Chihuahua Mexico;3. Cinvestav, Libramiento Norponiente #2000, Fracc. Real de Juriquilla. C.P. 76230, Santiago de Querétaro, Qro, Mexico;4. Department of Physics and Astronomy University of Texas at San Antonio One UTSA Circle, San Antonio, Texas 78249, USA |
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| Abstract: | ObjectivesThe aim of this study was to investigate the effect of the nanostructured hydroxyapatite (NHAp) and titanium dioxide nanoparticles (NTiO2) on dispersion in an adhesive containing monomers of Dipenta erythritol penta-acrylate monophosphate (PENTA) and Urethane dimethacrylate (UDMA), as well as evaluating the structural, optical and mechanical behavior of the composite material for dental aesthetic application.MethodsThe NHAp powders were synthesized through the wet chemical methods of hydrothermal and ultrasound-assisted precipitation. The microstructure, morphology and composition analysis of the powder of NHAp and NTiO2 were performed by scanning and transmission electron microscopy. The optical microscopic identification of the different colors was obtained due to varying the amounts of NHAp and NTiO2 in the adhesive. On the other hand, the diffuse reflectance spectra of the coatings were evaluated every 2 nm with the wavelength from 400 to 800 nm for combined specular and diffuse reflectance. The nanomechanical properties of the aesthetic coating such as (H), elastic modulus (E) and nanoscratching were evaluated by nanoindentation. The roughness of the composite coatings were evaluated by AFM.ResultsFrom different powders combinations, NHAP 75%Wt-NTiO2 %25 Wt, at (10Wt %) into a dental adhesive, the resulting mixture manifested the optimum aesthetic white appearance. The scanning and transmission electron microscopy images confirmed that the HAp nanorods and TiO2 nanoparticles sized were 55 nm and 20 nm respectively prepared by the high-energy ball mixed process. The values of nanomechanical properties of the optimum aesthetic coating were hardness, H = 3.2 ± 0.3 GPa, elastic modulus, E = 78 ± 3 GPa, Yield point, Y = 107 MPa ± 2 and scratching, maximum wear track deformation 3.7 ± 0.12 μm2. The percentage of reflectance to optimum aesthetic white appearance was of 46.83% at 423 nm of wavelength.ConclusionsThe nanocomposite PENTA/UDMA with mixtures of Nanohydroxyapatite and titanium dioxide may be considerate as a mechanical toughened, also an option to modify shade qualities for dental aesthetic applications. |
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| Keywords: | Adhesives Hydroxyapatite Titanium dioxide Nanoindentation |
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