Knoop hardness of ten resin composites irradiated with high-power LED and quartz-tungsten-halogen lights.

摘要: This study compared a high-power light-emitting-diode (LED) curing light (FreeLight 2, 3M ESPE) with quartz-tungsten-halogen (QTH) (TriLight, to determine which was the better at photo-polymerising 10 resin composites. Class I preparations were prepared 4-mm deep into human teeth and filled different The composites irradiated for 50% or 100% of their recommended times using LED light, QTH on either high medium power setting. Fifteen minutes later, Knoop hardness measured depth 3.5 mm from surface. When by times, all stayed above 80% maximum composite least 1.5 mm; three maintained that more than mm. Repeated measurements analysis variance indicated two-way three-way interactions between depth, significant (p < 0.01). To eliminate choice as factor, an overall comparison lights performed Kruskal-Wallis test distribution free multiple comparisons ranked values. used manufacturer's time, best 3mm time not significantly