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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.)

Influence of ionizing radiation on the mechanical properties of BisGMA/TEGDMA based experimental resin

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Author(s):
Campos, L. M. P. [1] ; Boaro, L. C. [2] ; Santos, L. K. G. [1] ; Parra, D. F. [1] ; Lugao, A. B. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Nucl & Energy Res Inst, BR-05508 Sao Paulo - Brazil
[2] Univ Santo Amaro, Sch Dent, Dept Biomat, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Radiation Physics and Chemistry; v. 115, p. 30-35, OCT 2015.
Web of Science Citations: 6
Abstract

Dental restorative composites are activated by visible light and the polymerization process, known as direct technique, is initiated by absorbing light in a specific wavelength range (450-500 nm). However this technique presented some disadvantages. If light is not inserted correctly, layers uncured can cause countless damage to restoration, especially with regard to mechanical properties. A clinical alternative used to reduce the shortcomings of direct application is the use of composite resins for indirect application. These composites are adaptations of resins prepared for direct use, with differences mainly in the healing process. Besides the traditional photoactivation, indirect application composites may be submitted to particular curing conditions, such as a slow curing rate, heating, vacuum, and inert-gas pressure leading to an oxygen-free environment. However few studies have been conducted on the process of post-curing by ionizing radiation at low doses. On this sense the purpose of this study was to evaluate possible interactions of ionizing radiation in the post-curing process of the experimental composites based on BisGMA/TEGDMA filled with silica Aerosil OX-50 silanized. Characterization of the experimental composites was performed by thermogravimetry analysis, infrared spectroscopy, elastic modulus and flexural strength. Statistical analysis of results was calculated by one-way ANOVA/Tukey's test. Cross-linking of the polymeric matrix caused by ionizing radiation, influenced the thermal stability of irradiated specimens. FTIR analysis showed that the ionizing radiation induced a post-cure reaction in the specimens. The irradiation dose influenced directly the mechanical properties that showed a strong positive correlation between flexural strength and irradiation and between modulus strength and irradiation. (C) 2015 Elsevier Ltd. All rights reserved. (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 type: Scholarships in Brazil - Post-Doctorate