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Polymer brush surface modification for composite resin fillers

Grant number: 16/05035-5
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): July 01, 2016
Effective date (End): June 30, 2017
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Marcelo Giannini
Grantee:Bruna Marin Fronza
Supervisor abroad: Jeffrey W. Stansbury
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
Research place: University of Colorado, Denver (CU), United States  
Associated to the scholarship:15/23104-1 - Approaches in filler particle and resin matrix interfacial design of dental composites, BP.DR


The aim of this study is to develop a novel interphase structure between filler particles and resin matrix based on polymer brushes, by using alternative silane agents and oligomers in order to reduce the shrinkage stress that is developed during polymerization and improve the mechanical properties of these materials. Pilot studies will be conducted to determine the silane to cover fillers, associating functional and non-functional agents. Oligomeric chains will be attached at one end to the filler surface to create a transactional area between organic and inorganic phase, i.e. polymer brushes. Modified particles will be characterized including thermogravimetric analysis, gel permeation chromatography, dynamic light scattering and transmission electron microscopy. Experimental composites will be fabricated by mechanical mixing of resin and filler (30 wt% filler loading). Polymerization kinetics and degree of conversion will be analyzed according to the aspects of fillers modification. The results will be qualitatively and quantitatively analyzed following the factors under study and the comparison among groups of relevance for this project will be done. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FRONZA, B. M.; RAD, Y.; SHAH, P. K.; BARROS, M. D.; GIANNINI, M.; STANSBURY, J. W. Nanogel-Based Filler-Matrix Interphase for Polymerization Stress Reduction. JOURNAL OF DENTAL RESEARCH, v. 98, n. 7, p. 779-785, JUL 2019. Web of Science Citations: 0.
FRONZA, BRUNA MARIN; LEWIS, STEVEN; SHAH, PARAG K.; BARROS, MATTHEW D.; GIANNINI, MARCELO; STANSBURY, JEFFREY W. Modification of filler surface treatment of composite resins using alternative silanes and functional nanogels. Dental Materials, v. 35, n. 6, p. 928-936, JUN 2019. Web of Science Citations: 1.

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