Effect of fiber insertion depth on antibacterial efficacy of photodynamic therapy against Enterococcus faecalis in rootcanals.

Autor: Rödig T; Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany. troedig@med.uni-goettingen.de., Endres S; Private Dental Practice, Hannover, Germany., Konietschke F; Department of Mathematical Sciences, University of Texas at Dallas, Richardson, TX, USA., Zimmermann O; Institute for Medical Microbiology, Center for Hygiene and Human Genetics, University of Göttingen, Göttingen, Germany., Sydow HG; Institute of Anatomy and Embryology, University Medical Center, Göttingen, Germany., Wiegand A; Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany.
Jazyk: angličtina
Zdroj: Clinical oral investigations [Clin Oral Investig] 2017 Jun; Vol. 21 (5), pp. 1753-1759. Date of Electronic Publication: 2016 Sep 03.
DOI: 10.1007/s00784-016-1948-3
Abstrakt: Objectives: This in vitro study evaluated the effect of fiber insertion depth on antimicrobial efficacy of antimicrobial photodynamic therapy (aPDT) using a photosensitizer (PS; toluidine blue) and a red light-emitting diode (LED) in root canals infected with Enterococcus faecalis.
Materials and Methods: Single-rooted extracted teeth were prepared with nickel-titanium-instruments, sterilized, contaminated with E. faecalis, and incubated for 72 h. Roots were randomly divided into four experimental groups: PS only, LED only, aPDT with LED in the apical third, aPDT with LED in the coronal third, as well as into infection and sterile controls (each n = 10). Samples were taken by collecting standardized dentine shavings from the root canal walls. After serial dilution and culturing on blood agar, colony-forming units (CFU) were counted.
Results: Both aPDT groups showed a CFU reduction of 1-2 log 10 steps compared with the infection control, whereas the effect of fiber insertion depth was negligible (<0.5 log 10 steps). CFU reduction of approximately 0.5 log 10 steps for PS alone was detected compared with the infection control, but PS alone was less effective than both aPDT groups. No antibacterial effect was detected for LED alone.
Conclusions: aPDT reduced E. faecalis within the root canal, whereas fiber insertion depth had a negligible influence on antimicrobial effectiveness of aPDT.
Clinical Relevance: The insertion depth of the light-emitting diode may not influence the antibacterial efficacy of photodynamic therapy against E. faecalis in straight root canals.
Databáze: MEDLINE
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