Evaluation of the effectiveness of the use of photodynamic therapy (PDT) after cleaning and shaping the root canal: An in vivo study

Antonio Henrique Braitt, Herley Peixoto Murta, Evaldo Almeida Rodrigues, Carlos Eduardo da Silveira Bueno

Objective: The purpose of this study was to assess the effectiveness of photodynamic therapy (PDT) in teeth with periapical lesion seen radiographically. Methods: 24 anterior teeth were selected and divided into two groups with 12 teeth each. Three samples were collected in each specimen. In G1, endodontic treatment was performed with a nickel/titanium rotary system, with the first sample being collected at surgical opening; the second, after endodontic treatment; and the third, seven (07) days after canal preparation. In G2, the samples were collected by means of the same procedures used in G1, except for the second sample which was taken after instrumentation and photodynamic therapy (PDT). The third sample was collected seven days (07) after PDT. Sodium hypochlorite at 5.25% was used as irrigating solution, neutralized with 5% sodium thiosulfate at a given time of the study. Photon Laser III was used for 40 seconds, with 0.005% methylene blue dye as photosensitive substance. All samples from both groups were send to laboratory analysis to have potential contamination of the root canal system checked. Conclusion: The results revealed no statistically significant difference between groups, but further randomized studies are necessary to demonstrate the effectiveness of PDT.

Keywords: Laser therapy. Enterococcus faecalis. Root canal therapy.

How to cite: Braitt AH, Murta HP, Rodrigues EA, Bueno CES. Evaluation of the effectiveness of the use of photodynamic therapy (PDT) after cleaning and shap- ing the root canal: An in vivo study. Dental Press Endod. 2013 May-Aug;3(2):41-5.

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