Abstract:
The objective of this research was the utilization of diode lasers to enhance the
hardness of chemical cure composite dental restorative material. Three samples
were prepared, the first one was irradiated with 675 nm wavelength , 30 mW
output power, the second one irradiated with 820 nm wavelength, 200 mW output
power, the two samples were irradiated for 3, 4, 5, and 6 minutes. The third sample
was left without irradiation as a control sample. The hardness of the three samples
was measured at different time intervals .The increasing ratio of the hardness was
determined for every used laser and exposure time .The results showed that
irradiation of the filling material with diode laser was increase the rate of
polymerization interaction which is increase the hardness of the filling material.
The higher percentage of hardness increasing after irradiating the filling material
with 675 nm diode laser was 23% while the higher percentage after irradiating the
filling material with 820 nm diode laser was 22%, compared with the hardness’s of
unirradiated samples.
