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Approaches in filler particle and resin matrix interfacial design of dental composites

Grant number: 15/23104-1
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2016
Effective date (End): February 28, 2019
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Marcelo Giannini
Grantee:Bruna Marin Fronza
Host Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
Associated scholarship(s):16/05035-5 - Polymer brush surface modification for composite resin fillers, BE.EP.DR


The aim of the study is to develop a new interface design between filler particles and resin matrix of restorative composites by the use of different silane agents and oligomers, to reduce the shrinkage stress that is developed during the polymerization process and improve the mechanical properties of these materials. Pilot studies will be conducted to determine the silane to cover the fillers, associating functional and non-functional agents. Oligomeric chains will be tethered at one end to the filler surface with either an aromatic backbone or an aliphatic backbone, to create a transactional area between organic and inorganic phase. Modified particles will be comprehensively 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). The effect of this interfacial variation on composite properties such as degree of conversion and polymerization kinetics, volumetric shrinkage, shrinkage stress measurements, flexural modulus and strength will be studied. The results from each experiment will be statistically analyzed according to the factors under study and the comparison among groups of relevance for this project.

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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, . (15/23104-1, 16/05035-5)
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, . (16/05035-5, 15/23104-1)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
FRONZA, Bruna Marin. Modification of filler particle and resin matrix interfacial design of restorative composites. 2019. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba Piracicaba, SP.

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