Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins

COSTA, S. X. S ; GALVAO, M. R ; et al.

In: Journal of thermal analysis and calorimetry, Jg. 103 (2011), Heft 1, S. 219-227

Online academicJournal - print, 61 ref

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Thermal properties and degree of conversion (DC%) of two composite resins (microhybrid and nanocomposite) and two photo-activation methods (continuous and gradual) displayed by the light-emitting diode (LED) light-curing units (LCUs) were investigated in this study. Differential scanning calorimetry (DSC) thermal analysis technique was used to investigate the glass transition temperature (Tg) and degradation temperature. The DC% was determined by Fourier transform infrared spectroscopy (FT-IR). The results showed that the microhybrid composite resin presented the highest Tg and degradation temperature values, i.e., the best thermal stability. Gradual photo-activation methods showed higher or similar Tg and degradation temperature values when compared to continuous method. The Elipar Freelight 2™ LCU showed the lowest Tg values. With respect to the DC%, the photo-activation method did not influence the final conversion of composite resins. However, Elipar Freelight 2™ LCU and microhybrid resin showed the lowest DC% values. Thus, the presented results suggest that gradual method photo-activation with LED LCUs provides adequate degree of conversion without promoting changes in the polymer chain of composite resins. However, the thermal properties and final conversion of composite resins can be influenced by the kind of composite resin and LCU.

Titel:	Continuous and gradual photo-activation methods: influence on degree of conversion and crosslink density of composite resins
Autor/in / Beteiligte Person:	COSTA, S. X. S ; GALVAO, M. R ; JACOMASSI, D. P ; BERNARDI, M. I. B ; HERNANDES, A. C ; DE SOUZA RASTELLI, A. N ; ANDRADE, M. F
Link:	Volltext (PDF) View record from PASCAL Archive
Zeitschrift:	Journal of thermal analysis and calorimetry, Jg. 103 (2011), Heft 1, S. 219-227
Veröffentlichung:	Dordrecht: Springer, 2011
Medientyp:	academicJournal
Umfang:	print, 61 ref
ISSN:	1388-6150 (print)
Schlagwort:	General chemistry, physical chemistry Chimie générale, chimie physique Sciences exactes et technologie Exact sciences and technology Sciences appliquees Applied sciences Industrie des polymeres, peintures, bois Polymer industry, paints, wood Technologie des polymères Technology of polymers Domaines d'application Application fields Analyse thermique Thermal analysis Análisis térmico Application dentaire Dental application Aplicación dental Calorimétrie différentielle balayage Differential scanning calorimetry Análisis calorimétrico barrido exploración Densité réticulation Crosslink density Densidad reticulado Dentisterie restauratrice Dental restoration Restauración dental Diode électroluminescente Light emitting diode Diodo electroluminescente Durcissement (matière plastique) Curing (plastics) Endurecimiento (material plástico) Ethylène oxyde copolymère Ethylene oxide copolymer Etileno óxido copolímero Matériau composite Composite material Material compuesto Méthacrylate copolymère Methacrylate copolymer Metacrilato copolímero Polymérisation photochimique Photopolymerization Polimerización fotoquímica Résine Resins Resina Spectrométrie IR Infrared spectrometry Espectrometría IR Transformation Fourier Fourier transformation Transformación Fourier Uréthanne copolymère Urethane copolymer Uretano copolímero Composite dentaire Composite resins Dental curing lights Fourier transform infrared spectroscopy LED
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Article File Description: text Language: English Author Affiliations: Department of Restorative Dentistry, Araraquara School of Dentistry, São Paulo State University-UNESP, Humaitá St., 1680, Araraquara, SP 14801-903, Brazil ; Laboratório de Biofotônica, Grupo de Óptica, Instituto de Fisica de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil ; Grupo de Crescimento de Cristais e Materiais Cerâmicos, Instituto de Fisica de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil Rights: Copyright 2015 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: Polymer industry, paints, wood

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