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EnglishThis study evaluated the variation of conversion degree (DC) in the 12 hours following initial photoactivation of a low-shrinkage composite resin (Venus Diamond).The conversion degree was monitored for 12 hours using Attenuated Total Reflection (ATR) F-TIR Spectroscopy. The composite was placed in 1 or 2 mm rings and cured for 10 or 20 seconds with a LED lamp. ATR spectra were acquired from the bottom surface of each sample immediately after the initial photoactivation (P=0), 30 minutes (P=0.5) and 12 hours after photoactivation (P=12) in order to obtain the DC progression during the post-curing period. Interactions between thickness (T), irradiation time (I) and post-curing (P) on the DC were calculated through ANOVA testing.All the first order interactions were statistically significant, with the exception of the T-P interaction. Furthermore, the shift from P=0 to P=0.5 had a statistically higher influence than the shift from P=0.5 to P=12. The post-curing period played a fundamental role in reaching higher DC values with the low-shrinkage composite resin tested in this study. Moreover, both the irradiation time and the composite thickness strongly influenced the DC.Increased irradiation time may be useful in obtaining a high conversion degree (DC) with a low-shrinkage nano-hybrid composite resin, particularly with 2 mm composite layers.
| Titolo: | Post-curing conversion kinetics as functions of the irradiation time and increment thickness. |
| Autori Riconosciuti: | |
| Autori: | N. Scotti;A. Venturello;F. A. Coero;D. Pasqualini;D. S. Paolino;F. Geobaldo;E. Berutti |
| Data di pubblicazione: | 2013 |
| Abstract: | This study evaluated the variation of conversion degree (DC) in the 12 hours following initial photoactivation of a low-shrinkage composite resin (Venus Diamond).The conversion degree was monitored for 12 hours using Attenuated Total Reflection (ATR) F-TIR Spectroscopy. The composite was placed in 1 or 2 mm rings and cured for 10 or 20 seconds with a LED lamp. ATR spectra were acquired from the bottom surface of each sample immediately after the initial photoactivation (P=0), 30 minutes (P=0.5) and 12 hours after photoactivation (P=12) in order to obtain the DC progression during the post-curing period. Interactions between thickness (T), irradiation time (I) and post-curing (P) on the DC were calculated through ANOVA testing.All the first order interactions were statistically significant, with the exception of the T-P interaction. Furthermore, the shift from P=0 to P=0.5 had a statistically higher influence than the shift from P=0.5 to P=12. The post-curing period played a fundamental role in reaching higher DC values with the low-shrinkage composite resin tested in this study. Moreover, both the irradiation time and the composite thickness strongly influenced the DC.Increased irradiation time may be useful in obtaining a high conversion degree (DC) with a low-shrinkage nano-hybrid composite resin, particularly with 2 mm composite layers. |
| Volume: | 21 |
| Fascicolo: | 2 |
| Pagina iniziale: | 190 |
| Pagina finale: | 195 |
| Anno del convegno: | 2013 |
| Digital Object Identifier (DOI): | 10.1590/1678-7757201302380 |
| URL: | http://dx.doi.org/10.1590/1678-7757201302380 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3881873/ |
| Parole Chiave: | Analysis of Variance, Composite Resins; chemistry/radiation effects, Curing Lights; Dental, Humans, Materials Testing, Nanocomposites; chemistry/radiation effects, Phase Transition, Polymerization; radiation effects, Spectroscopy; Fourier Transform Infrared, Surface Properties, Time Factors |
| Rivista: | JOURNAL OF APPLIED ORAL SCIENCE |
| Appare nelle tipologie: | 03A-Articolo su Rivista |
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