IADR Abstract Archives
Curing Efficiency of LED Polymerization Lights
Objectives: The aim of this study was to evaluate the curing efficiency of so called polywave polymerisation lights offering a broadband spectrum from 380 to 515nm in comparison with conventional lights having a spectrum between 430 to 480 nm for camphorquinone initiated composites.
Methods: The intensity spectrum (i(l)) of each device (3M ESPE, Elipar S10 (S1); Vivadent Ivoclar, Bluephase G2 (G2); Kerr, Demi (De); GC America, G-Light (GL); 3M ESPE, Elipar Freelight 2 (F2)) was measured (n=5) with an ocean optics S2000 spectrometer and an 14mm optical sphere. Each spectrum was convolved with the normalized absorption spectrum (anorm(l)) of camphorquinone. The ratio between the intensity of the convolved spectrum and the original one equals the curing efficiency of the light source for camphorquinone, and therefore all composites based solely on this initiator system (see formula). Statistical analysis was done by one-way ANOVA.
Results: The following curing efficiency values were found (SD in brackets): S1: 87% (0,05); G2: 73% (0,05); De: 82% (0,11); GL: 80% (0,02); F2: 86% (0,05). Elipar S10 and Freelight 2 emitted significantly more efficient light for cure of camphorquinone initiated composites than Demi and so-called polywave lights (Bluephase G2, G-Light). Furthermore, all conventional lights showed a significantly higher curing efficiency than the polywave devices (one way ANOVA, p<0,0005).
Conclusions: Elipar S10 and Freelight 2 are expected to cure camphorchinone-based composites more efficiently than Demi and polywave lights (Bluephase G2, G-Light).