Effectiveness and safety of low-concentrated ozonized water for the reduction of contamination in dental unit water lines

Heliyon

Tadashi Yamamoto¹  Takashi Ito²  Yasuyoshi Shiota³  Keisuke Okubo⁴  Yusuke Kawata⁴  Shogo Takashiba⁴ 

[1] Division of Dentistry, National Hospital Organization Shikoku Cancer Center, 160 Minamiumemoto-cho-ko, Matuyama, 791-0280, Japan;Division of Dentistry, Tottori Municipal Hospital, 1-1 Matoba, Tottori, 680-8501, Japan;Center for Innovative Clinical Medicine, Okayama University Hospital, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8525, Japan;Department of Pathophysiology - Periodontal Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8525, Japan;

关键词: Materials science;    Dental chair unit water line (DUWL);    Biofilm;    Heterotrophic bacteria;    Ozonized water;    Low-concentration;   

DOI  :  

来源: DOAJ

【 摘 要 】

Contamination of dental unit waterlines (DUWL) with heterotrophic bacteria can cause problems in immune compromised patients (aged, tumor and organ transplantation-patients). We focused on the use of low-concentrated ozonized water (OZW) as the biofilm formation restraint system for DUWL. Here, we examined the effects of low-concentrated OZW on the growth of bacteria and related biofilm formation and harmfulness to dental unit components (DUCs) in vitro. Objectives: To evaluate the bactericidal effects of OZW on biofilms in DUWL and DUC in vitro. Methods: Low-concentrated OZW (0.4 mg/L) was generated using an OZS-PTDX generator. Heterotrophic bacterial biofilms in old DUWL tubes and Candia albicans solution (control microbe) were treated with OZW for 1 h with gentle agitation before static culturing for 96 h in Reasoner's 2A liquid media. The control solutions were 0.1% cetylpyridinium chloride (CPC), chlorinated tap water (TW), and phosphate-buffered saline (PBS). Adenosine triphosphate (ATP) amounts of the microbes were measured and the biofilms of these microbes were observed using scanning electron microscopy (SEM). Moreover, surfaces of DUC soaked in OZW and TW were observed by SEM. Results: The OZW reduced ATP levels in microbes to 50% compared to TW and PBS treatment, although CPC reduced it below detection limits. SEM observation revealed deformation of microbes cultured with OZW, whereas no changes were seen on DUC surfaces. Conclusions: Low-concentrated OZW is bactericidal against heterotrophic bacteria biofilms and it is not harmful to DUC, suggesting that it might be useful in preventing DUWL contamination.

【 授权许可】

Unknown