Efficacy of disinfectants against gram-positive bacteria found on thermoplastic retainers

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Objective: The present study aimed to compare the efficacy of two disinfectants against Gram-positive bacteria, particularly Streptococcus mutans, for use as a disinfectant for dental retainers. Methods: In total, 35 thermoplastic retainers in this study were categorized into three immersion groups: Control group; mouthwash group, using chlorhexidine 0.1%; and denture cleanser tablet group. The retainers were worn for 15 days, and Gram-positive bacteria were enumerated before and after the retainers were immersed. Results: We found a significant difference in bacterial numbers between the two disinfectant groups and the non-disinfectant or control group. Both disinfectant groups had decreased numbers of Gram-positive bacteria. Conclusions: Disinfectant use is effective in decreasing the load of Gram-positive bacteria on thermoplastic retainers.

Original languageEnglish
Pages (from-to)130-133
Number of pages4
JournalInternational Journal of Applied Pharmaceutics
Publication statusPublished - 1 Apr 2019


  • Disinfectant
  • Disinfection
  • Gram-positive bacteria
  • Streptococcus mutans
  • Thermoplastic retainer


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