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Journal of Oral Laser Applications

Year 2002
Volume 2 , Issue 3

Pages: 151 - 157

A Clinical Comparison of the Bactericidal Effect of the Diode Laser and 5% Sodium Hypochlorite in Necrotic Root Canals

Norbert Gutknecht/Thomas Alt/Gunter Slaus/Peter Bottenberg/Paul Rosseel/Sabine Lauwers/Friedrich Lampert

Purpose: In previous studies, it has been shown that diode laser irradiation at a wavelength of 810 nm is able to kill bacteria in infected root canals. These studies were mostly in vitro studies and dealt only with selected bacterial species. The present clinical study compares the antibacterial activity of a high power diode laser with 5% sodium hypochlorite (NaOCl) solution in root canals. Materials and Methods: Thirty single-rooted nonvital teeth from thirty patients were randomly subdivided into two groups. The first group underwent laser treatment in addition to canal preparation, and the second group was instrumented and irrigated with 5% NaOCl. Before and after each treatment session, microbiological samples were taken. The teeth were treated at three appointments without intracanal dressings between appointments. Results: All 30 root canals showed cultivable flora before treatment. Endodontic treatment reduced microbes both in terms of number of infected canals and number of species. At the last treatment session, laser application resulted in 11 and NaOCl irrigation in 10 bacteria-free canals (p > 0.05 according to the Chi-square test). Conclusion: The study indicates that the use of diode laser radiation is as effective in disinfecting root canals as irrigation with 5% sodium hypochlorite.


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