Comparison of the Bactericidal Effects of Two Different Diode Laser Wavelengths 810 NM And 980 NM within the Treatment of E. Faecalis-Infected Root Canals | Abstract

Journal of Research in Medical and Dental Science
eISSN No. 2347-2367 pISSN No. 2347-2545

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Comparison of the Bactericidal Effects of Two Different Diode Laser Wavelengths 810 NM And 980 NM within the Treatment of E. Faecalis-Infected Root Canals

Author(s): Murtadha Mustafa Thamer*, Salah Alkurtas A


Background: A variety of causes can lead to endodontic treatment failure, including bacterial persistence, insufficient root
canal cleansing or obturation, incorrect coronal seal, and untreated canals (missed canals). The endodontic treatment
failure arises from many reasons and the main one is the existence of some bacterial species inside the root canals like the
Enterococcus faecalis, which is the most common type. It possesses unique characteristics that enable it to evade
disinfection leading to radicular inflammation. Newer laser technology disinfection techniques have been recommended to
be effective for routine endodontic treatment as a result of the development of the potent antimicrobial capabilities of lasers
in recent years.
Aim: In vitro study, comparative between the influences of two various wavelengths of diode laser (810 nm and 980 nm)
within the root canal system against Enterococcus faecalis during endodontic treatment.
Materials and methods: Preparation and sterilization of a total of forty canals before being contaminated with
Enterococcus faecalis bacteria and cultured for two weeks. After that, the human permanent teeth were separated into four
groups at random. A (control group) specimens that have not been treated, group B (its specimens were treated with 17%
EDTA and sodium hypochlorite at 5.25%), group C (specimens radiated with 810 nm diode laser), and Group D (specimen
radiated with 980 nm diode laser). After the disinfection steps, specimens were plated on blood agar media in order to count
the number of colonies for experimental groups.
Results: In both experimental groups, laser irradiation reduced the number of bacterial colonies. The reduction in the
microbial count was significantly greater in the 810 nm laser group (70.8%) compared to the 980 nm laser group (29.1%).
Using Dunnett's T3 test, which demonstrated significant differences among the groups with an exception of that betweengroup
C and other groups which was not a significant difference. However, the greatest bacterial eradication was achieved
when sodium hypochlorite was used in conjunction with the EDTA treatment (81.6% CFU/ml reduction).
Conclusion: The 810 nm diode lasers sterilized and killed E. Faecalis bacteria more successfully than the 980 nm diode laser.
However, when sodium hypochlorite at 5.25% was utilized in combination with the 17% EDTA treatment, the most bacterial
clearance was observed.

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