Although conventional method carries all the debris, studies on persisting infections in root canals show bacteria and
their toxins spread from the root canal and contaminate the apical region. Thus developes apical periodontitis or
symptoms, and loss of tooth. Even if the treatment has adequate success, anatomy of root canal system can be very
complexwith accessory canals. The disinfecting effect of laser radiation has only recently been used in dentistry. Laser
irradiation has a bactericidal effect. Each wavelength has its own advantages and limitations according to their different
absorption characteristics, depending on their 'absorption coefficient'. The sterilizing efficiency of two types of
wavelengths, a new fiber laser 1940- nm Thulium fiber Laser and an 2940 nm Er:YAG Laser were compared in this
study. Irradiation with a power of 0.50 W with 1940- nm Thulium fiber Laser disinfected 95,15% of bacteria, however
irradiation with same laser power with Er:YAG Laser caused a reduction of 96,48 %. But there was no significant
difference in the disinfection effect of two different laser groups ( p < 0.05, Mann- U-Whitney Test). In addition to this,
Er :YAG Laser caused three times more reduction from its own positive control group where 1940- nm Thulium fiber
Laser caused 2,5 times effective disinfection.
Ayşe Sena Sarp and Murat Gülsoy, "Comparing irradiation parameters on disinfecting enterrecoccus faecalis in root canal disinfection," Proc. SPIE 9692, Lasers in Dentistry XXII, 969204 (Presented at SPIE BiOS: February 14, 2016; Published: 29 February 2016); https://doi.org/10.1117/12.2217958.
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