Influence of Curing Mode and Time on Degree of Conversion of One Conventional and Two Self-adhesive Resin Cements

Autor(es)

Aguiar, T. R. ^[1] ; Francescantonio, M. D. ^[1] ; Arrais, C. A. G. ^[2] ; Ambrosano, G. M. B. ^[3] ; Davanzo, C. ^[4] ; Giannini, M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Restorat Dent, Piracicaba, SP - Brazil

^[2] Univ Guarulhos, Dept Operat Dent, Guarulhos, SP - Brazil

^[3] Univ Estadual Campinas, Dept Social Dent, Piracicaba, SP - Brazil

^[4] Univ Estadual Campinas, Inst Chem, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 35, n. 3, p. 295-299, MAY-JUN 2010.
• Citações Web of Science: 30

Resumo

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 post-curing 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. (AU)

• Processo FAPESP: 07/53214-7 - Avaliação das propriedades físico-químicas de cimentos resinosos auto-adesivos
• Beneficiário: Thaiane Rodrigues Aguiar
• Linha de fomento: Bolsas no Brasil - Mestrado