With the development of China's economy and improving people's health awareness, the demand for oral medications.
Services have increased rapidly. In recent years, with the continuous publicity of oral Health, the awareness of oral.
The Health of domestic residents has gradually increased. The results of the fourth national oral Health epidemiological
the survey showed that the awareness rate of residents' oral health knowledge was 60.1%, and 84.9% of them had a positive
Attitude towards oral health care.
At present, the dental chair unit (DCU) is necessary medical equipment in the stomatology department's daily diagnosis and
treatment process. The DCU is a complex integrated system that provides substances (gas, water, and electricity) and
equipment. The dental unit waterline (DUWL) (starting now referred to as DUWL) is an integral part of the dental treatment
table. Its primary function is to provide water and provide treatment equipment such as mobile phones and three-purpose
guns during the treatment process. Provide therapeutic water for cooling and flushing.
In 1963, British dentist Blake first reported on DUWL contamination and found that DUWL contained many bacteria. The study
found that after the new oral comprehensive treatment table was connected to the water supply pipeline for a week, the
bacterial concentration of the water supply pipeline could reach 2×105CFU/mL. After long-term use, the bacterial
concentration could reach up to 1.0×106CFU/mL.
DUWL, on the other hand, consists of narrow, elongated tubes that are highly susceptible to bacterial contamination and
colonization to form biofilms. During the treatment process, the bacteria colonized in DUWL are often washed down by the
water flow and can enter the patient's mouth with the water flow, or can be inhaled into the respiratory tract by the
patient or dental staff through the aerosol generated by the ultrasonic scaler and the high-speed turbine handpiece. This
leads to infection; therefore, DUWL contamination is considered one of the crucial ways to cause dental cross-infection.
Bacteria isolated from DUWL mainly come from the natural environment, such as Legionella, Pseudomonas, non-tuberculous
mycobacteria, etc.; followed by bacteria from the human body, such as Staphylococcus aureus, protozoa, fungi, molds, etc.,
although Relatively rare, there have been reports of such pathogens isolated from DUWL. The production of these bacteria
has caused varying degrees of harm to the mouth and body.
In 2017, the Chinese Journal of Disinfection published "Research on Intervention Methods for Waterway Water Pollution in Oral Comprehensive Treatment Stations in Medical Institutions," written by Shanghai CDC and others. The effect of ozone water disinfection and Hypochlorous acid water of oral treatment platform waterways (DUWLs for short) was observed. The main contents and viewpoints of the article are summarized as follows:
1. This study found that hypochlorous acid water with available chlorine of 20 mg/L can significantly reduce the bioburden of DUWLs waterway and improve the water quality of DUWLs.
2. Under the action of hypochlorous acid water, the total number of bacterial colonies showed a slow increase in the first week due to the continuous shedding of the biofilm and when the biofilm was thoroughly disposed of
, the water quality of the entire pipeline showed a long-term improvement.
3. Disinfection intervention measures can significantly improve the sanitation quality of oral comprehensive treatment table water. The disinfection effect of hypochlorous acid water treatment is better than that of ozone water.
Note: The solubility of ozone in water is relatively low, generally 0.1-10mg/L. When the concentration of ozone water is high, ozone can easily escape from the water, resulting in a pungent odor.
In recent years, domestic scholars have also started researching hypochlorous acid water. The level of water samples was detected by using three different concentrations of hypochlorous acid water (10, 20, and 40 mg/L) to disinfect DUWLs continuously.
The average pass rates were 98.33%, 98%, and 99.25%. During the period, the disinfection of DUWLs was stopped for seven days, and then the microbial biomass of the water samples was tested. The disinfection effect of water on the waterway of the oral comprehensive treatment table is unmistakable.
Other researchers used ten mg/L hypochlorous acid water to test DUWLs. The result showed that the qualified rate of water hygiene quality in the waterway of the oral comprehensive treatment table before disinfection was only 8.85%. 15%。 After continuous disinfection with hypochlorous acid water, the hygienic quality pass rate increased 49.15%. It is suggested that DUWLs are seriously polluted. The use of hypochlorous acid water to disinfect DUWLs can improve the sanitation quality of waterway water, thereby preventing infection.
It can be seen from the above experiments that the feasibility of pollution control of hypochlorous acid water for disinfection of oral comprehensive treatment table waterway is verified. It is reported that about DUWL pollution, China has formulated the "GB/T Sanitary Requirements for Water System Disinfection of Dental Units (Draft for Approval)." The significant improvement has added a better boost to the oral treatment field.
