Evaluation of three different decontamination techniques on biofilm formation, and on physical and chemical properties of resin composites

J Biomed Mater Res B Appl Biomater. 2018 Apr;106(3):945-953. doi: 10.1002/jbm.b.33907. Epub 2017 Apr 25.


Objectives: This study evaluated three different sterilization/disinfection techniques for resin composites on bacterial growth and surface modification after decontamination.

Methods: Two resin composites were sterilized/disinfected with three different techniques: UV light, 1% chloramine T, and 70% ethanol. Four different times were used for each technique to determine the shortest time that the solution or UV light was effective. The influence of sterilization/disinfection technique on bacterial growth was evaluated by analyzing the metabolic activity, using the AlamarBlue™ assay, bacterial viability, and SEM images from biofilms of Streptococcus mutans. The surface change, after the process, was analyzed with ATR/FTIR and SEM images. The solutions used for decontamination (1% chloramine-T and 70% ethanol) were analyzed with 1 H-NMR to identify any resin compounds leached during the process.

Results: One minute of decontamination was efficient for all three methods tested. Chloramine-T increased the surface porosity on resin composites, no changes were observed for UV light and 70% ethanol, however, 1 H-NMR identified leached monomers only when 70% ethanol was used. No chemical change of the materials was found under ATR/FTIR analyses after the decontamination process. Chloramine-T, with no previous wash, increased the bacterial viability for both resin composites and increased the bacterial metabolism for the resin composite without fluoride.

Conclusion: UV light had no interference on the resin composites properties tested using 1 min of exposure compared to the other decontamination methods. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 945-953, 2018.

Keywords: biofilm; resin composite; sterilization; surface analysis.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Adhesion
  • Biofilms / growth & development*
  • Chloramines / pharmacology
  • Composite Resins / chemistry*
  • Composite Resins / radiation effects
  • Decontamination / methods*
  • Dental Materials
  • Disinfectants / pharmacology
  • Ethanol / pharmacology
  • Porosity
  • Streptococcus mutans / drug effects
  • Tosyl Compounds / pharmacology
  • Ultraviolet Rays


  • Chloramines
  • Composite Resins
  • Dental Materials
  • Disinfectants
  • Tosyl Compounds
  • chloramine-T
  • Ethanol