Scholarship 20/15417-8 - Resinas compostas, Materiais nanoestruturados - BV FAPESP
Advanced search
Start date
Betweenand

Influence of the organic matrix behavior of thio-urethane-based resin composites containing functionalized TiO2 nanostructures

Grant number: 20/15417-8
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Start date: December 06, 2021
End date: December 05, 2022
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Adilson Yoshio Furuse
Grantee:Genine Moreira de Freitas Guimarães
Supervisor: Carmem Silvia Costa Pfeifer
Host Institution: Faculdade de Odontologia de Bauru (FOB). Universidade de São Paulo (USP). Bauru , SP, Brazil
Institution abroad: Oregon Health & Science University, United States  
Associated to the scholarship:20/02960-5 - The role of the addition of TiO2 nanostructures functionalized in modified resin composites containing thiouretane, BP.DR

Abstract

Resin composites containing functionalized TiO2 nanostructures have been shown to increase the degree of conversion and create more stable materials. Also, thiourethane oligomers have been promising to increase the fracture toughness and reduce the polymerization stress of methacrylate-based materials. However, network formation has not been elucidated in these materials yet. Thus, the aim of this study is to evaluate the effect of different functionalized TiO2 nanostructures added to experimental resin composites containing thiourethane, to evaluate their influence in the sol/gel composition and network structure using extraction methods, polymerization stress, dynamic mechanical analysis and light-transmission through the composite. TiO2 nanostructures will be synthesized and functionalized with 3-Trimethoxysilyl-Propeil-Methacrylate (TSMPM) or Tiouretano-silane (TiOU). Experimental resin composites containing a mixture of BisGMA and TEGDMA (75-25%) will be made. Thiourethane oligomers in the proportion of 20% by weight will be added in the resin matrix. Also 0.25wt% camphorquinone (CQ) and 1% by weight of ethyl dimethylamine benzoate (DABE) will be added. Glass particles of 1µm barium-aluminum silicate silanized with methacrylate will be added in variations of 77.4 to 78.3% by weight, according to the concentration of TiO2 nanostructures that are used (0.3 or 0.9% by weight). Specimens will be immersed in two different solvents (water for 7 days or dicholoromethane for 48 h) and the leachates for both solutions will be analyzed with 1H-NMR. Polymerization stress will be determined with a cantilever system in real time by a Bioman device. Polymeric network characteristics will be analyzed by dynamic mechanical analysis and the effects of light-transmission through the composite. The data will be analyzed using ANOVA and the Tukey multiple comparison test. The level of significance adopted will be 5%. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
More itemsLess items
Articles published in other media outlets ( ):
More itemsLess items
VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)