Naslov
Rapid 3 s curing: what happens in deep layers of new bulk-fill composites?

Autori
Marović, Danijela ; Par, Matej ; Crnadak, Ana ; Šekelja, Anđelina ; Negovetić Mandić, Višnja ; Gamulin, Ozren ; Rakić, Mario ; Tarle, Zrinka

Izvornik
Materials (1996-1944) 14 (2021), 3; 515, 15

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

Ključne riječi
3 s curing ; bulk-fill composites ; flexural strength ; flexural modulus ; degree of conversion ; aging ; radiant exitance ; addition–fragmentation chain transfer

Sažetak
This study assessed the influence of rapid 3 s light curing on the new generation of bulk-fill resin composites under the simulated aging challenge and depths up to 4 mm. Four bulk-fill materials were tested: two materials designed for rapid curing (Tetric PowerFill-PFILL ; Tetric PowerFlow-PFLW) and two regular materials (Filtek One Bulk Fill Restorative- FIL ; SDR Plus Bulk Fill Flowable-SDR). Three- point bending (n = 10) was used to measure flexural strength (FS) and flexural modulus (FM). In the 3 s group, two 2 mm thick specimens were stacked to obtain 4 mm thickness, while 2 mm-thick specimens were used for ISO group. Specimens were aged for 1, 30, or 30 + 3 days in ethanol. The degree of conversion (DC) up to 4 mm was measured by Raman spectroscopy. There was no difference between curing protocols in FS after 1 day for all materials except PFLW. FM was higher for all materials for ISO curing protocol. Mechanical properties deteriorated by increasing depth (2-4 mm) and aging. ISO curing induced higher DC for PFLW and FIL, while 3 s curing was sufficient for PFILL and SDR. The 3 s curing negatively affected FM of all tested materials, whereas its influence on FS and DC was highly material-specific.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Dentalna medicina

POVEZANOST RADA