SciELO - Scientific Electronic Library Online

vol.26 issue1Oxygen release, microleakage and shear bond strength of composite restorations after home dental bleachingAnalysis of contamination of endodontic absorbent paper points author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Odonto Ciência

On-line version ISSN 1980-6523


SANTANA, Ivone Lima et al. Thermal behavior of direct resin composites: glass transition temperature and initial degradation analyses. Rev. odonto ciênc. (Online) [online]. 2011, vol.26, n.1, pp.50-55. ISSN 1980-6523.

PURPOSE: The association of direct resin composites with simple thermal treatments may improve the mechanical properties of these materials. However, the ideal temperature for heat application depends on the thermal behavior of each material, such as glass transition (Tg) and initial degradation temperatures. To propose a heat treatment methodology, this study evaluated the thermal behavior of five commercial direct resin composites using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). METHODS: Photo-irradiation was achieved in cylindrical specimens (3×2 mm) using a photo-activator source (600 mW/cm2 for 40 s). Thermal analyses were performed by DSC and TGA using a temperature range from 25 ºC to 900 ºC. RESULTS: Tg values obtained by DSC were 130.6 ºC for FillMagic, 129 ºC for Glacier, 143.5 ºC for Te-Econom, 147.5 ºC for Prisma APH and 143.7 ºC for Natural Look. A moderate weight loss began at around 270 ºC for all materials, which represented the initial degradation temperature. Conclusion: Regarding the heat treatment itself, it was concluded that the effective temperature for heat treatment is material dependent.

Keywords : Dental composite; thermal treatment; DSC; TGA.

        · abstract in Portuguese     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License