Water Quality and Biofilm Formation in Dental Unit Waterline Systems in Mangaung, South Africa.

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Tác giả: Olga de Smidt, Chantal Bronwyn Kader, Jeanné Oosthuysen

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: England : International dental journal , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 739923

 BACKGROUND: Biofilm formation in dental unit waterlines (DUWLs) and the consequent microbial contamination of dental chair unit (DCU) water is a significant challenge. The South African government has no explicit requirements for water quality supplied to DCUs or for disinfection protocols for DUWLs. AIM: To assess bacterial water quality and presence of biofilm-associated organisms in DUWLs of open and closed system DCUs. METHODS: Standard water sampling was followed in accordance with the South African National Standard for drinking water (SANS 241:1) and used as reference for microbial water quality to measure heterotrophic plate counts (HPC) and total coliforms for possible water contamination. Pseudomonas aeruginosa and Legionella spp. are common opportunistic pathogens found in DUWL and were also assessed using selective media. RESULTS: HPC exceeded the national standard of <
 10 × 10 CONCLUSION: Contamination levels of DUWL water and surfaces of open and closed system DCUs were high, highlighting the need for national regulations of DUWL quality and decontamination protocols in South Africa.
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