Evaluation of Different Curing Energies on Some Properties of Two Recent Resins Composite.

Objective: Evaluation the curing capability of laser energy on new types of dental composites, in comparison to what’s already available, is one of the main aims for this study, regarding the values of microhardness and the degree of conversion.
Methods: Fifty-six specimen prepared from two types of dental resin composites (SDR BulkFil© and Ceram.X One© resin composite), twenty-eight from each type of composite divided for four subgroups seven specimen for each. Samples were prepared in a Teflon split mold with fixed dimensions packed in incremental technique following the manufactures instructions, to produces each specimen in cylindrical shape with 4mm diameters and 6mm thickness. Three of each subgroup cured with different curing time using (SIROLaser© Blue laser, Sirona) laser device for (5sec,10sec and 20sec) respectively on 445nm wavelength and 500 mw power, and the last group cured by (BlueLEX LD-105, Monitex©) LED curing unit for 20sec. The microhardness of top and bottom surfaces tested by Vicker’s hardness testing machine (HV-1000DT) and then the specimens powdered and tested for the degree of conversion using Fourier transform infrared spectroscopy (Agilent Cary 630 FTIR).
Results: For SDR BulkFil composite resin group, top surface; It was found that 5-seconds laser cured subgroup recorded the highest mean ± SD value of Vickers μ-hardness by 20-seconds LED cured subgroup. Regardless to composite resin type, it was found that, laser curing energy recorded higher (DC) percentage mean values than LED curing one.
Conclusions: SIROLaser Blue laser device (500 mw/ cm2 and wavelength 445nm) have a significant capability of curing of Dental composites. Inanition, regardless to curing energies, it was concluded that Ceram.X One resin composite recorded statistically significant higher (DC) percentage mean values than SDR BulkFil composite resin.