Naslov
Long term post-cure conversion of bulk-fill composites

Autori
Lapas Barisic, Matea ; Par, Matej ; Gamulin, Ozren ; Panduric, Vlatko ; Tarle, Zrinka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Journal of Dental Research / - , 2015

Skup
Continental European and Scandinavian Divisions Meeting

Mjesto i datum
Antalya, Turska, 2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
post-cure, polymerization, bulk-fill composites

Sažetak
Objectives: To follow the degree of conversion (DC) of two commercial bulk-fill composite materials (Tetric EvoCeram Bulk Fill and Tetric EvoCeram Bulk Fill Flow/Ivoclar Vivadent) for up to seven days post cure. Methods: DC was determined with Raman spectroscopy by comparing the relative change of band at 1640 cm-1 to the reference band at 1610 cm-1 of uncured and cured material.For each material, five samples were prepared.The cylindrical sample (d=3 mm, h=6mm) were light cured with irradiance of 1090 mW/cm2 for 20 seconds.After curing, the samples of Tetric EvoCeram Bulk Fill and Tetric EvoCeram Bulk Fill Flow were stored at 37oC.DC was measured immediately after curing (0 days), 1 day post-cure and 7 days post-cure.Statistical analysis was performed using a dependent samples t-test. Results: DC values (%) were (0 days/1 day/7 days):Tetric EvoCeram Bulk Fill 58.3/66.4/71.5 ; Tetric EvoCeram Bulk Fill Flow 71.6/80.1/80.7.After 1 day post-cure, the DC increase was statistically significant for all the composites tested.Additionally, the DC increase was significant after 7 days post-cure for Tetric EvoCeram Bulk Fill. Conclusions: A long term post-cure DC increase was observed for both tested bulk-fill composites, suggesting that mechanical properties and biocompatibility develop gradually over at least seven days.This may be due to the alternative photoinitiator systems and polymerization modifiers used in bulk-fill materials.

Izvorni jezik
Engleski

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