The temperature effects of diode laser on pulpal tissues forthe teeth whitening treatment
Teeth whitening using laser diode technology has gained popularity due to its advantages, such as shorter treatment times, and reduced tooth sensitivity and gingival irritation. However, a significant concern remains regarding the potential damage to pulpal tissues from the heat generated during treatment. This research focuses on both the change in teeth color and the temperature changes in pulpal tissues relative to the power density of the laser diode used. The study involved treating human-extracted teeth coated with 38% hydrogen peroxide using an 808 nm laser diode at power densities of 10.9, 16.1, and 36.7 W/cm². Two exposure methods were examined: a single exposure of 60 seconds and two exposures of 30 seconds each. Teeth color changes were measured using the CIE Lab* system. Results indicated that a higher power density (36.7 W/cm²) produced more luminous teeth but also significantly increased pulpal tissue temperature. A power density of 16.1 W/cm² was identified as the maximum safe limit to avoid damaging pulpal tissue. Additionally, the double-exposure method of 30 seconds each was more effective, yielding more luminous teeth with less heat generation compared to a single 60-second exposure.
