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Background <p>Chlorhexidine (CHX) can lower the bacterial contamination on masks. This study explores how effectively CHX reduces the bacterial spectrum in the patient’s oral cavity and subsequently how this influences the contamination of masks.</p> Methods <p>Two intraoral samples were collected prior to any aerosol-generating treatment: the first before a 60-s CHX rinse and the second 10&#xa0;min after. After dental treatment, the practitioner’s mask was imprinted onto agar plates. After cultivation, a Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-ToF) was used to identify the colony forming units. The identified species of the intraoral samples and mask imprints were then analysed based upon matches in bacterial species and quantity.</p> Results <p>A total of 108 unique patients were included, each receiving one aerosol-producing treatment. The total number of detected bacterial species in the oral cavity before the CHX rinse was 628, after 490. <i>Staphylococcus aureus</i> was found twice as often before the CHX rinse. The average amount of colony forming units on the mask’s imprints after the CHX rinse was 15.2. The bacterial species occurred in very similar proportions, with Staphylococcus species making up more than 50%. No species match between the oral samples and mask samples after the CHX rinse occurred most frequently (68.5%), followed by one match (25.9), two matches (3.7%) and three matches (1.9%).</p> Conclusions <p>A preprocedural CHX rinse reduces bacterial contamination on masks but has little effect on the spectrum of transmitted microorganisms. Our results suggest that the bacterial spectrum on the mask was not significantly influenced by the preprocedural change in the oral microbiota. Therefore, while CHX enhances clinical hygiene, it does not eliminate the risk of pathogenic transmission.</p>

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Influencing viable oral bacteria in the patient's oral cavity and on the dentist’s mask

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月28日

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  • Madline Priska Gund,
  • Jusef Naim,
  • Josefine Wittig,
  • Janina Lang,
  • Matthias Hannig,
  • Barbara Gärtner,
  • Alexander Halfmann,
  • Gabor Boros,
  • Stefan Rupf

摘要

Background

Chlorhexidine (CHX) can lower the bacterial contamination on masks. This study explores how effectively CHX reduces the bacterial spectrum in the patient’s oral cavity and subsequently how this influences the contamination of masks.

Methods

Two intraoral samples were collected prior to any aerosol-generating treatment: the first before a 60-s CHX rinse and the second 10 min after. After dental treatment, the practitioner’s mask was imprinted onto agar plates. After cultivation, a Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-ToF) was used to identify the colony forming units. The identified species of the intraoral samples and mask imprints were then analysed based upon matches in bacterial species and quantity.

Results

A total of 108 unique patients were included, each receiving one aerosol-producing treatment. The total number of detected bacterial species in the oral cavity before the CHX rinse was 628, after 490. Staphylococcus aureus was found twice as often before the CHX rinse. The average amount of colony forming units on the mask’s imprints after the CHX rinse was 15.2. The bacterial species occurred in very similar proportions, with Staphylococcus species making up more than 50%. No species match between the oral samples and mask samples after the CHX rinse occurred most frequently (68.5%), followed by one match (25.9), two matches (3.7%) and three matches (1.9%).

Conclusions

A preprocedural CHX rinse reduces bacterial contamination on masks but has little effect on the spectrum of transmitted microorganisms. Our results suggest that the bacterial spectrum on the mask was not significantly influenced by the preprocedural change in the oral microbiota. Therefore, while CHX enhances clinical hygiene, it does not eliminate the risk of pathogenic transmission.