Photodynamic Therapy in Patients With Gingivitis

Patientes will receive periodontal treatment (scaling and root planing - SRP) with the ultrasound. The SRP will be done in one session. The PDT placebo wil be done using an agent with the same vehicle as that of the methylene blue to mimic irrigation with the photosensitizer; the laser will be switched off at the time of application.

patients will receive the same scaling and root planing treatment that placebo group.However the PDT will be done only on one side of mouth using methylene blue 0.005% .The red laser diode (λ = 660 nm) will be applied with an output power of 100mW . The laser head will be positioned in direct contact with the pseudo periodontal pockets.