A 39-year-old woman sought specialized treatment complaining of a large, painful oral ulcer in the right buccal vestibule after receiving emergency endodontic treatment 3 days earlier. The patient reported that the tooth, the mandibular right first premolar, was not isolated with a rubber dam and that she felt the extrusion of a liquid in the buccal tissues. Clinically, a necrotic area with raised erythematous borders was observed in the mandibular right side. The clinical diagnosis was a chemically induced ulcer caused by a sodium hypochlorite accident. Dexamethasone and amoxicillin were prescribed to control pain and prevent secondary infection. The large size of the lesion was an indication for application of low-level laser therapy (LLLT), which was delivered at a wavelength of 685 nm (output power, 30 mW; power density, 0.5 mW⁄cm2 ; energy density, 6 J⁄cm2 ) every 2 days for a total of 6 sessions. The LLLT was applied to the necrotic area with a punctual mode (2 points) for 12 seconds per point. The patient reported a substantial reduction in pain after the second application, and the wound was completely healed after 6 sessions. The results observed in this patient suggest that LLLT could aid patients in recovering from NaOCl-related lesions.
Keywords: accident; endodontic treatment; low level laser therapy; sodium hypochlorite.