Naslov
Monomer conversion and shrinkage force kinetics of low-viscosity bulk-fill resin composites.

Autori
Marović, Danijela ; Tauboeck, Tobias T. ; Attin, Thomas ; Pandurić, Vlatko ; Tarle, Zrinka

Izvornik
Acta odontologica scandinavica (0001-6357) 73 (2015), 6; 474-480

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Bulk-fill materials ; flowable resin composites ; polymerization ; shrinkage stress

Sažetak
Objective. To investigate the subsurface degree of conversion (DC) and shrinkage force formation of low-viscosity (flowable) bulk-fill composite materials. Materials and methods. Three flowable bulk-fill resin composites [SureFil SDR flow (SDR ; Dentsply DeTrey), Venus Bulk Fill (VB ; Heraeus Kulzer) and x-tra base (XB ; VOCO)] and one conventional flowable control composite material [EsthetX flow (EX ; Dentsply DeTrey)] were tested. The materials were photoactivated for 20 s at an irradiance of 1170 mW/cm2 and the DC (n = 5) was recorded at 0.1-, 1.5- and 4-mm depth using Fourier transform infrared spectroscopy. Shrinkage forces (n = 5) of 1.5-mm-thick specimens were continuously recorded for 15 min using a custom- made stress analyzer. Data were statistically analyzed by ANOVA, Tukey's HSD and Bonferroni's post-hoc tests (α = 0.05). Results. SDR generated the significantly lowest shrinkage forces (22.9 ± 1.4 N), but also attained the significantly lowest DC at 1.5-mm depth (67.5 ± 0.8%). The conventional flowable composite EX generated the significantly highest shrinkage forces (40.7 ± 0.7 N) and reached a significantly higher DC (74.4 ± 1.3%) compared to SDR and XB at 1.5-mm depth. The shrinkage force values of VB (29.4 ± 1.1 N) and XB (28.3 ± 0.6 N) were similar (p > 0.05). All materials attained significantly higher DC at 4-mm depth than at the near-surface. Conclusion. The tested low-viscosity bulk-fill materials show lower shrinkage force formation than a conventional flowable resin composite at high levels of degree of conversion up to 4-mm incremental thickness.

Izvorni jezik
Engleski

Znanstvena područja
Dentalna medicina

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