This study was conducted to assess the clinical effect of photodynamic therapy (PDT) in the decontamination of the deep dentin of deciduous molars submitted to partial removal of carious tissue. After cavity preparation, dentin samples were taken from the pulp wall of nineteen deciduous molars before and after PDT application. Remaining dentin was treated with 0.01% methylene blue dye followed by irradiation with an InGaAlP diode laser (λ -660 nm; 40 mW; 120 J/cm 2 ; 120 s). Dentin samples were microbiologically assessed for the enumeration of total microorganisms, Lactobacillus spp. and mutans streptococci. There was no significant difference in the number of colony-forming units (CFU) for any of the microorganisms assessed (p > 0.05). Photodynamic therapy, using 0.01% methylene blue dye at a dosimetry of 120 J/cm 2 would not be a viable clinical alternative to reduce bacterial contamination in deep dentin.
IntroduçãoA estomatite aftosa recorrente (EAR) é uma condição comum caracterizada por úlceras múltiplas, pequenas, ovoides, com margem circunscrita, halo eritematoso e fundo amarelo ou cinza, com aparecimento típico primeiramente na infância ou adolescência 1 . A manifestação dessa alteração dá-se em surtos e com um curso crônico, com tempo limitado da lesão, na maior parte dos casos 2,3 . Do ponto de vista epidemiológico, a EAR é uma das mais comuns desordens orais, conhecida por afetar cerca de 20% da população em algum momento da vida 4 . Apesar de sua alta prevalência na população, sua etiopatogenia perdura como um enigma, pois, mesmo com muitas investigações, os estudos têm falhado em encontrar a sua exata etiologia
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