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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of flexural modulus, flexural strength and degree of conversion in BISGMA/TEGDMA resin filled with montmorillonite nanoparticles

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Author(s):
Campos, Luiza M. P. ; Boaro, Leticia C. ; Santos, Tamiris M. R. ; Marques, Pamela A. ; Almeida, Sonia R. Y. ; Braga, Roberto R. ; Parra, Duclerc F.
Total Authors: 7
Document type: Journal article
Source: JOURNAL OF COMPOSITE MATERIALS; v. 51, n. 7, p. 927-937, MAR 2017.
Web of Science Citations: 5
Abstract

This study had as its main objective to evaluate the flexural properties (strength and modulus) and degree of conversion of a dimethacrylate resin containing different amounts of nanoparticulated clay Montomorillonite (MMT) as filler. A series of composites containing similar amounts (in volume) of barium glass particles was also tested as control data. Eight formulations with polymeric matrix-based BisGMA/TEGDMA (Bisphenol A Bis(2-hydroxy-3 methacryloxypropyl) Ether/Triethyleneglycol Dimethacrylate), four added with MMTand four added with barium glass in the volume concentration of 20, 30, 40 and 50 vol% were studied. The degree of conversion was determined using near-IR spectroscopy. Elastic modulus and flexural strength were determined by the three-point bending test. The dispersion of MMT nanoparticles was determined by means of X-ray diffraction and transmission electron microscopy analysis. The fillers montomorillonite and barium glass interacted with polymer matrix-based BisGMA/TEGDMA in a distinct manner. Although the addition of montomorillonite nanoparticles resulted in similar degree of conversion and higher elastic modulus values at all concentrations tested, only at the 20 vol% the flexural strength was statistically higher, compared to the control groups filled with barium glass. This could be related to the need of concentration optimization of montomorillonite for each type of polymer matrix in order to adjust or improve mechanical properties. The addition of low concentrations (< l 20% vol) of montomorillonite nanoparticles in dental composites resins -such as additive or hybrid filler -should be studied, aiming to the reduction of polymerization shrinkage, better mechanical properties and improvement of a new technology for future applications. (AU)

FAPESP's process: 13/07229-3 - ASSESSMENT OF CLAY MINERAL NANOPARTICLE ADDITION IN BISGMA/TEGMA PHOTO-ACTIVATED POLYMERIC MATRICES FOR DENTISTRY APPLICATION
Grantee:Luiza Mello de Paiva Campos
Support Opportunities: Scholarships in Brazil - Post-Doctoral