Indirect Restoration Thickness and Time after Light-Activation Effects on Degree of Conversion of Resin Cement

Ana Paula Almeida Ayres, Carolina Bosso Andre, Rafael Rocha Pacheco, Adriana Oliveira Carvalho, Renata Cantanhede Bacelar-Sá, Frederick Allen Rueggeberg, Marcelo Giannini

Research output: Contribution to journalArticle

Abstract

This study evaluated the effects of indirect restorative materials, curing conditions and time on the degree of conversion (DC) of a dual-cured resin cement using infrared spectroscopy. The resin cement (RelyX Unicem 2, 3M ESPE) was applied to the diamond surface of a horizontal attenuated-total-reflectance unit and activated using one of following conditions: self-cure, direct light exposure, light exposure through indirect restorative materials (resin nano-ceramic: Lava Ultimate, 3M ESPE or feldspathic ceramic: Vita Blocks Mark II, Vita Zahnfabrik). Four thicknesses (0.5, 1.0, 1.5 or 2.0 mm) of each indirect material were analyzed, and the light-activation was performed using a blue LED light. Data (n=5) were analyzed by three-way ANOVA, Tukey's post hoc and Dunnett's tests (α=5%). No significant differences in DC were observed between indirect materials of similar thickness. All groups exhibited higher DC after 10 min than after 5 min. At both times points, the self-cure group exhibited significantly lower DC than all the light exposure groups. Only when the overlying indirect restoration had a thickness of 2 mm did DC decrease significantly. The presence of a thick, indirect restoration can decrease the DC of resin cement. DC after 10 min was higher than after 5 min. The self-cure mode yielded lower DC than the light-activating one.

Original languageEnglish (US)
Pages (from-to)363-367
Number of pages5
JournalBrazilian dental journal
Volume26
Issue number4
DOIs
StatePublished - Jul 1 2015

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Resin Cements
Light
Ceramics
Diamond
Spectrum Analysis
Analysis of Variance

ASJC Scopus subject areas

  • Dentistry(all)

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Indirect Restoration Thickness and Time after Light-Activation Effects on Degree of Conversion of Resin Cement. / Ayres, Ana Paula Almeida; Andre, Carolina Bosso; Pacheco, Rafael Rocha; Carvalho, Adriana Oliveira; Bacelar-Sá, Renata Cantanhede; Rueggeberg, Frederick Allen; Giannini, Marcelo.

In: Brazilian dental journal, Vol. 26, No. 4, 01.07.2015, p. 363-367.

Research output: Contribution to journalArticle

Ayres, Ana Paula Almeida ; Andre, Carolina Bosso ; Pacheco, Rafael Rocha ; Carvalho, Adriana Oliveira ; Bacelar-Sá, Renata Cantanhede ; Rueggeberg, Frederick Allen ; Giannini, Marcelo. / Indirect Restoration Thickness and Time after Light-Activation Effects on Degree of Conversion of Resin Cement. In: Brazilian dental journal. 2015 ; Vol. 26, No. 4. pp. 363-367.
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