Assessment of the degree of conversion in light-curing orthodontic resins with various viscositiesReport as inadecuate

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Applied Adhesion Science

, 3:26

51st Meeting of the Brazilian Dental Materials Group


ObjectiveThe 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.

MethodsFive 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.

ResultsThe 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.

ConclusionThe 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.

KeywordsDegree of conversion Orthodontics resins Viscosity  Download fulltext PDF

Author: Lorenna Oliveira Fernandes de Araujo - Osmar Barreto - Adriano Augusto Melo de Mendonça - Rodrigo França


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