Influence of the oscillation frequency of different side-to-side toothbrushes on noncontact biofilm removal
The objective of this study was to investigate the influence of different oscillation frequencies of three powered toothbrushes with side-to-side action for noncontact biofilm removal in an artificial interdental space model.
Materials and methods
A three-species biofilm (Porphyromonas gingivalis, Fusobacterium nucleatum and Streptococcus sanguinis) was formed in vitro on protein-coated titanium disks using a flow chamber system combined with a static biofilm growth model. The oscillation frequencies of three commercial side-to-side toothbrushes were evaluated by means of a dose response. The frequency was decreased in steps (100, 85, 70, 55, and 40%). Subsequently, the biofilm-coated substrates were exposed to the side-to-side toothbrushes. The biofilm volumes were measured using volumetric analyses (Imaris 8.1.2) with confocal laser scanning microscope images (Zeiss LSM700).
Compared to maximum oscillation frequency (100%), lower oscillation frequencies (up to 40%) resulted in reduced median percentages of biofilm reduction (median biofilm reduction up to 53% for maximum oscillation frequency, and up to 13% for 40% oscillation frequency) (p ≥ 0.03). In addition, decreasing the oscillation frequencies of the side-to-side toothbrushes showed an enhanced variety in the results of repeated experiments.
The oscillation frequency of the tested side-to-side toothbrushes affected the biofilm reduction in an interdental space model.
Within a toothbrush, higher oscillation frequencies may lead to beneficial effects on interdental biofilm removal by noncontact brushing.
KeywordsSide-to-side toothbrush Oscillation frequency Biofilm Hydrodynamic effect Oral hygiene Preventive dentistry
We thank Krystyna Lenkeit (Clinic of Periodontology, Cariology and Endodontology, University of Basel) and Elisabeth Filipuzzi-Jenny (Clinic of Preventive Dentistry and Oral Microbiology, University of Basel) for laboratory assistance; Dr. Oliver Biehlmaier (Image Core Facility, Biozentrum, University of Basel) for assistance with microscopic analyses; and Ing. EurEta Sascha Martin (Department of Physics, University of Basel) for the construction of the toothbrush apparatus.
The titanium disks were provided by Straumann AG (Basel, Switzerland).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
The study was approved by the Research Ethics Committee of the University of Basel, Switzerland (EK:295/08).
Informed consent was obtained from saliva providers.
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