Effect of a Combination of Photodynamic Therapy and Chitosan on Streptococcus mutans (An In Vitro Study)
Journal of Lasers in Medical Sciences,
Vol. 11 No. 4 (2020),
3 October 2020
,
Page 405-410
Abstract
Introduction: This study aimed to assess the effect of photodynamic therapy (PDT) and chitosan separately and in combination with Streptococcus mutans.
Materials and Methods: This in vitro experimental study evaluated 216 microbial samples in 6 groups. First, 5 μL of 0.5 McFarland standard suspension of S. mutans was added to each well of an ELISA microplate; 100 μL of Mueller Hinton broth was also added to each well; 180 wells contained S. mutans suspension while 36 wells were devoid of bacteria. Group 1 served as the negative control and had no bacteria. Group 2 served as the positive control and S. mutans in the positive control wells did not undergo any intervention. In groups 3 and 4, PDT with a 50 mW low-level laser was performed for 30 and 40 seconds respectively. In group 5, 3 mg/mL of chitosan (100 μL) was used. In group 6, 3 mg/mL (100 μL) of chitosan was used in combination with PDT (50 mW laser for 30 seconds). The laser was irradiated under aseptic conditions at a 660 nm wavelength with 50 mW power. Data were analyzed using one-way ANOVA and Tukey’s test.
Results: PDT combined with chitosan showed maximum bactericidal effect followed by PDT for 40 seconds and chitosan groups (P < 0.05). PDT for 30 seconds showed a minimum bactericidal effect (P < 0.05). All pairwise comparisons revealed significant differences (P < 0.001).
Conclusion: Chitosan and PDT alone can be used to decrease the S. mutans count. However, their combined use has a greater bactericidal effect on S. mutans.
- Streptococcus mutans
- Chitosan
- Photodynamic therapy
How to Cite
References
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