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Assessment of the degree of conversion in light-curing orthodontic resins with various viscosities

2015; Springer Science+Business Media; Volume: 3; Issue: 1 Linguagem: Inglês

10.1186/s40563-015-0055-z

2196-4351

Lorenna Oliveira Fernandes de Araujo, Oliver Silva Costa Barreto, Adriano Augusto Melo de Mendonça, Rodrigo França,

Dental Erosion and Treatment

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.