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2024-11-23 18:21

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Conference: Bucharest University Faculty of Physics 2014 Meeting

Section: Polymer Physics

Title:

Investigation by AFM Nanomicrography of Dental Resins Composites

Authors:

E. GATIN(1,2), Roxana ILICI(2), Adriana BĂLAN(3), Elena MATEI(4), Lidia CIOBANU(5)

Affiliation:

1) Materials Department, Faculty of Physics, University of Bucharest P.O. Box MG 11, Magurele – Bucharest, Romania;

2) University of Medicine‚ Carol Davila’, Faculty of Dentistry, Calea Plevnei 19, Sector 5, Bucharest, Romania;

3) University of Bucharest, 3Nano-SAE Research Centre, P.O. Box MG- 38, 077125 Magurele, Romania;

4) INFIM Institute, PO Box MG. 7, Magurele – Bucharest, Cod 077125, Romania;

5) „St. Pantelimon” Hospital, Sos Pantelimon Nr. 340 - 342, Sector 2, Bucharest, Romania.

E-mail

edgatin@netscape.net

Keywords:

composites, dental restorative materials, dental cements, tooth cavities

Abstract:

Light-cured composites consisting of inorganic fillers and a polymer matrix are increasingly used as dental restorative materials or dental cements, because of their good esthetic and mechanical properties. The major problems that affects their performance is the intrinsic polymerization shrinkage and interface adhesion, which are an inevitable effect of the curing process as monomer molecules, converted into a crosslinked polymer network, exchanging van der Waals bonds for shorter covalent bonds. This volumetric shrinkage causes stress in confined environments such as tooth cavities. Strength and toughness are usually investigated by SEM-EDS, micro fractography and macro/micro hardness. To understand the process on the above mentioned properties at nanoscale, a series of investigations with AFM revealed local stresses and their dynamics for different conditions of polymerization. This study emphasizes a new perspective for investigation in dental medicine with nano / micro fractography, ageing and other secondary factors with AFM beside other structural investigations. Results from this study accomplished with a Raman investigation could predict a model for dentin interface bonding with application as a functional biomaterial.