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Type: Artigo de periódico
Title: Influence Of Curing Mode And Time On Degree Of Conversion Of One Conventional And Two Self-adhesive Resin Cements.
Author: Aguiar, Thaiane Rodrigues
Di Francescantonio, Marina
Arrais, Cesar A G
Ambrosano, Gláucia Maria Bovi
Davanzo, Celso
Giannini, Marcelo
Abstract: This study evaluated the effect of curing mode (auto- and dual-polymerizing mode) and time interval (5, 10 and 15 minutes) on the degree of conversion of resin cements. One conventional dual-cured resin cement (Panavia F 2.0 [Kuraray Medical Inc]) and two self-adhesive cements (RelyX Unicem [3M ESPE] and BisCem [BISCO, Inc]) were evaluated. The products (n = 5) were manipulated according to the manufacturer's instructions and applied to the surface of a horizontal attenuated reflectance unit attached to an infrared spectrometer. The materials were either light-cured for 40 seconds (dual-polymerizing mode) or allowed to auto-polymerize. The degree of conversion was calculated according to changes in the aliphatic-to-aromatic peak ratios prior to and 5, 10 and 15 minutes after light-activation or after mixing when the specimens were allowed to auto-polymerize. Data (%) were analyzed by two-way repeated measure ANOVA (curing mode and time interval) and Tukey's post-hoc test (alpha = 0.05%). The light-activating mode led to a higher degree of conversion values than the self-curing mode in self-adhesive cements (RelyX Unicem and BisCem), while there was no difference in the degree of conversion between the self- and light-cured groups of Panavia F 2.0 resin cement. All products showed a higher degree of conversion at 15 minutes postcuring than any other evaluation interval. The self-adhesive cements provide a higher degree of conversion values when light-activated. After 15 minutes of polymerization initiation, the degree of conversion was higher in all resin cements, regardless of the curing mode.
Subject: Carbon
Composite Resins
Curing Lights, Dental
Materials Testing
Phase Transition
Photochemical Processes
Resin Cements
Spectrophotometry, Infrared
Time Factors
Citation: Operative Dentistry. v. 35, n. 3, p. 295-9
Rights: fechado
Identifier DOI: 10.2341/09-252-L
Appears in Collections:Unicamp - Artigos e Outros Documentos

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