Quintessence Int. 2024 Feb 16;0(0):0. doi: 10.3290/j.qi.b4984231. Online ahead of print.
ABSTRACT
OBJECTIVES: To evaluate polymerization efficiency of different bulk-fill resin-based composites (BFRBCs) cured by monowave and polywave light curing units (LCUs), by assessment the degree of conversion (DC) and Vickers microhardness (VMH) at different depths.
METHOD AND MATERIALS: Two commercially available BFRBCs were used; Filtek One Bulk Fill Restorative (3M ESPE) (FOBF) and Tetric N-Ceram Bulk Fill (Ivoclar Vivadent) (TNBF). LCUs utilized were two light-emitting diodes (LEDs) LCUs; a monowave LED LCU (BlueLEX LD-105, Monitex) and a polywave LED LCU (Twin Wave GT-2000, Monitex). For each test, twenty cylindrical specimens (4 mm diameter, 4 mm thickness) were prepared from each BFRBC using a split Teflon mold. Ten specimens were light cured by monowave LCU and the other ten were light cured by polywave LCU according manufacturer’s recommendations. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) was used to assess DC. VMH tester was used to assess VMH. Statistical analysis was performed using three-way ANOVA and Tukey’s post-hoc tests (P <.05).
RESULTS: DC and VMH in BFRBC containing only camphorquinone as photo-initiator were similar when cured with either monowave or polywave LCU. However, BFRBC containing a combination of photo-initiators exhibited significantly higher DC and VMH when cured with polywave LCU. Although all groups showed statistically significant differences between top and bottom surfaces regarding DC and VMH, all of them showed bottom/top ratios >80% regarding DC and VMH.
CONCLUSION: Polywave LCU enhances polymerization efficiency of BFRBCs especially when the later containing a combination of photo-initiators, but does not prevent the use of monowave LCU.
PMID:38362702 | DOI:10.3290/j.qi.b4984231
