Avaliação in vitro das alterações morfológicas e infiltração apical de dentes tratados endodonticamente associados à terapia fotodinâmica

The antimicrobial PDT is an eficient method supporting the disinfection of the root canal system, which makes it important to study on the possibility of morphological and permeability caused by the diode laser on the root dentin structure. The purpose of this study was to investigate the morphological and percentage of root apical leakage after using the diode laser. Forty single teeth were instrumented by Protaper rotary system and irrigated with 5.25% NaOCl and 17% EDTA. They were then randomly divided into: G1 not receive PDT (control), G2: received pre-irradiation with toluidine blue photosensitizer and irradiation by GaAlAs laser diode. Then, ten teeth in each group were analyzed by SEM as morphological changes. The other ten teeth were filled and stained with Rhodamine B to evaluate the percentage of apical leakage. The results showed significant difference between G1 and G2 (p 0.001). The percentage of apical leakage was significantly higher in G2 than in G1 (p 0,001). O percentual de infiltração apical foi significativamente maior em G2 que em G1 (p