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A 49-year-old white female patient presented bilateral white plaques on the buccal mucosa and lateral border of tongue with erythematous background, which was asymptomatic. On anamnesis, the patient reported bald patches in the midscalp region. The oral lesions were treated with 0.05% aqueous clobetasol solution for 15 days without significant improvement. The clobetasol concentration was increased to 0.1% for a further 15 days without significant improvement of the lesions. All treatments were suspended for 15 days, and a biopsy was proposed. Histopathologic analysis suggested the diagnosis of lupus erythematosus. The patient was then referred to rheumatology for the conclusion of the diagnosis, where hematologic tests were requested, confirming lupus erythematosus. The patient has been followed by rheumatology and stomatology.

A terapia laser é um excelente procedimento clínico coadjuvante no tratamento endodôntico pela sua capacidade de promoção e melhoria da limpeza e da desinfecção do sistema endodôntico, porém existem poucos estudos sobre a possível utilização desta nova tecnologia nas situações clínicas de desobturação. O objetivo deste estudo foi avaliar in vitro o uso do laser de diodo (810nm, no modo contínuo) na desobturação da guta percha e do cimento AH Plus, utilizando ou não solvente químico (eucaliptol). Canais radiculares obturados tiveram o seu material obturador irradiado pelo laser de diodo de 810 nm (ZAP SOFTLASE, ZAP LASERS). A temperatura externa radicular durante a irradiação foi verificada no terço apical de 12 amostras utilizando o sistema de medida de temperatura. Observou-se um aumento de temperatura que variou de 2,47 a 9,35 ºC. Raízes foram divididas aleatoriamente em 4 grupos com 10 espécimes, variando o parâmetro de irradiação laser e a utilização do eucaliptol. Os grupos foram: Grupo I = irradiação (1,0 W) sem a utilização de solvente, Grupo II = irradiação (1,5 W) sem o uso de solvente, Grupo III = irradiação (1,0 W) + solvente, Grupo IV = (1,5 W) + solvente. As amostras foram radiografadas no sentido V-L e M-D, antes e após o retratamento, digitalizadas, e as áreas remanescentes de guta percha foram calculadas com o auxílio de programas de computador: Adobe Photoshop e ImageLab. Os resultados dos espécimes dos grupos: G1xG3; G1xG4; G2xG4 apresentaram diferença estatística. O modelo experimental selecionado permitiu verificar que a propagação da temperatura durante o procedimento não excedeu 10ºC e que a presença do solvente possibilitou a remoção de maior quantidade de material obturador auxiliando o processo de desobturação quando do emprego da irradiação com laser de diodo. The laser therapy is an excellent adjunct clinical procedure in endodontic treatment in order to improve the cleaning and disinfection of the root canal system; however few studies in the literature investigated the possible use of this new technology in the clinical situations of retreatment. The objective of this study was to evaluate in vitro the use of the diode laser (810nm, continuous mode) in the removal of gutta-percha and AH Plus sealer from the root canal, with or without the use of a chemical solvent (eucalyptol). Root canal filling materials were irradiated by 810 nm diode laser (ZAP SOFTLASE, ZAP LASERS). The temperature changes at the outer root surface were verified in the apical third of 12 samples during the irradiation. Temperature increase from 2.47 to 9.35 ºC was observed. The specimens were randomly divided in 4 groups of 10 roots each, varying the parameter of laser irradiation and the use of eucalyptol. The groups were assigned as follow: Group I = irradiation (1.0 W) without the solvent use, Group II = irradiation (1.5 W) without the solvent use, Group III = irradiation (1.0 W) + solvent, Group IV = (1.5 W) + solvent. Mesio-distal and buccolingual radiographs were taken before and after retreatment and the area of remaining gutta-percha in the root canals was determined with the aid of: Adobe Photoshop and ImageLab softwares. The groups: G1xG3; G1xG4; G2xG4 presented statistical differences.Based on the methodology used, it was verified that the temperature did not exceed 10ºC and that the presence of the solvent made it possible to remove large amounts of root canal filing material, aiding the desobturation process when used in association to the diode laser.