Effect of photodynamic therapy (PDT) on Enterococcus faecalis biofilm in experimental primary and secondary endodontic infections
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- 作者：Christian Tennert (1)
Katharina Feldmann (1)
Edwina Haamann (1)
Ali Al-Ahmad (1)
Marie Follo (2)
Karl-Thomas Wrbas (1)
Elmar Hellwig (1)
Markus J Altenburger (1)
1. Department of Operative Dentistry and Periodontology ; University of Freiburg 鈥?Medical Center ; Hugstetter Str. 55 ; 79106 ; Freiburg ; Germany
2. Department of Hematology and Oncology ; Core Facility ; University of Freiburg 鈥?Medical Center ; Hugstetter Str. 55 ; 79106 ; Freiburg ; Germany - 关键词：Photodynamic therapy ; PDT ; Photoactivated chemotherapy ; Phototherapy ; Laser ; Root canal disinfection ; Endodontic infection ; Enterococcus faecalis
- 刊名：BMC Oral Health
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：14
- 期：1
- 全文大小：929 KB
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41. The pre-publication history for this paper can be accessed here:l.com/1472-6831/14/132/prepub" class="a-plus-plus">http://www.biomedcentral.com/1472-6831/14/132/prepub - 刊物主题：Dentistry; Oral and Maxillofacial Surgery;
- 出版者：BioMed Central
- ISSN：1472-6831
文摘
Background To determine the antibacterial effect of photodynamic Therapy on Enterococcus faecalis (E. faecalis) biofilms in experimentally infected human root canals in primary infections and endodontic retreatments. Methods One hundred and sixty single-rooted extracted teeth with one root canal were prepared using ProTaper instruments. Seventy specimens were left without root canal filling and autoclaved. The root canals of another 70 specimens were filled with Thermafil and AH Plus and the root canal fillings were removed after 24 hours using ProTaper D files and plasma sterilized. The specimens were infected with a clinical isolate of E. faecalis for 72 hours. Samples were taken using sterile paper points to determine the presence of E. faecalis in the root canals. The specimens were randomly divided into groups according to their treatment with 20 teeth each and a control. In the PDT group the teeth were treated using PDT, consisting of the photosensitizer toluidine blue and the PDT light source at 635 nm. In the NaOCl (sodium hypochlorite) group the root canals were rinsed with 10 mL of 3% NaOCl. In the NaOCl-PDT group the root canals were rinsed with 10 mL of 3% of sodium hypochlorite and then treated with PDT. Samples were taken after treatments using sterile paper points. Additionally, remaining root canal filling material was recovered from the root canal walls. Survival fractions of the samples were calculated by counting colony-forming units. A one-way analysis of variance (ANOVA) was applied to the data to assess the effect of different treatment techniques. Results Antimicrobial treatment of root canals caused a significant reduction of bacterial load in all groups. NaOCl irrigation eliminated E. faecalis most effectively. PDT alone was less effective compared to NaOCl irrigation and the combination of NaOCl irrigation and PDT. CFU levels recovered from the filling material after NaOCl irrigation of the root canals were 10fold higher compared to PDT and the combination of NaOCl irrigation and PDT. Conclusions Photodynamic therapy killed E. faecalis in experimental primary endodontic infections and retreated human root canals. PDT is an effective supplement in root canal disinfection, especially in endodontic retreatments.