Lorenna Oliveira Fernandes de Araujo, Osmar Barreto, Adriano Augusto Melo de Mendonça, Rodrigo França
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Assessment of the degree of conversion in light-curing orthodontic resins with various viscosities
The aim of this study was to determine the degree of conversion (DC) for five orthodontic resins with different viscosities, to examine a probable relationship between the viscosity factor and the degree of conversion of the materials.
Five commercially-available light-cured orthodontic bonding resins were used in this study: two medium viscosity resins [transbond XT (TR); opal bond MV (OB)]; two low viscosity resins [vertise flow (VF); opal bond flow (OF)]; and a fluoride-releasing sealant [opal seal (OS)]. The specimens were made and polymerized for 20?s. Fourier Transformed Infrared spectroscopy (FTIR) was used to assess the DC of carbon-carbondouble bonds from all samples.
The DC was significantly different among the materials: (TR, 24.6?±?0.04?%; OB, 39?±?0.02?%; VF, 44.3?±?0.01?%; OS, 52.5?±?0.01?%; OF, 53?±?0.04?%; p?<?0.05) and the lowest viscosity materials had the highest DC values.
The resins studied have different DC values, which can be explained by the unique composition of each brand of resin. There is a relationship between the viscosity of a material and its degree of conversion, which is shown in this study by the two low-viscosity orthodontic resins that had a higher DC.
期刊介绍：
Applied Adhesion Science focuses on practical applications of adhesives, with special emphasis in fields such as oil industry, aerospace and biomedicine. Topics related to the phenomena of adhesion and the application of adhesive materials are welcome, especially in biomedical areas such as adhesive dentistry. Both theoretical and experimental works are considered for publication. Applied Adhesion Science is a peer-reviewed open access journal published under the SpringerOpen brand. The journal''s open access policy offers a fast publication workflow whilst maintaining rigorous peer review process.
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