Low-level laser group

The volunteers in Group three will receive irradiation with AsGaAl laser at a wavelength of 780 nm (Laser XT Therapy, DMC, São Carlos, Brazil) with relative isolation. A power metre (Laser Check, MMOptics, São Carlos, Brazil) will be used to determine the power of the equipment before and after all treatment interventions. The power will be set to 100 mW; energy density will be 35 J/cm² (considering a spot size of 0.028 cm² of the equipment) and the dose will be 1 J per point. Irradiation will be performed on a cervical point, an apical point and a point precisely over the lesion, totalling a dose of 3 J. Treatment will be performed in 3 sessions with a 72-hour interval between sessions.

During the laser treatments, both the volunteer and operator will use protective eyewear and all rules of safety will be obeyed. The volunteers will return 1 week, 1 month, 3 months and 6 months after the final treatment session for reevaluation using the VAS.