The waterway of the comprehensive dental treatment station should be cleaned and disinfected regularly to remove the dirt and biofilm attached to and adhered to the inner wall of the pipeline, so as to prevent the pipeline from causing secondary pollution to the water for diagnosis and treatment. The water for diagnosis and treatment should contain disinfection factors to kill pathogenic bacteria such as Legionella pneumophila and Pseudomonas aeruginosa in the water body, and control the total number of colonies.

Sterilization of dental equipment

1. Relevant reference standard specifications:

The total number of colonies in the water used for diagnosis and treatment should not exceed 100cfu/ml. The input water should be at least the drinking water that conforms to GB5749, and the water treated by the water treatment device should be used as the input water.

"DB11/T 1703-2019 Beijing-Technical Specifications for Waterway Disinfection of Dental Comprehensive Treatment Stations".

Disinfection of medical water

Total coliform: not detected; heat-resistant coliform: not detected; Escherichia coli: not detected; the total number of colonies must not exceed 100CFU/ml.

"GB5749-2006 Drinking Water Hygiene Standard".

CDC (Centers for Disease Control and Prevention) water quality standard: <500CFU/ml.

American Dental Association ADA (American Dental Association) water quality standard: <200CFU/ml.

2. Analysis of common traditional disinfection methods

The selection of waterway disinfectant for oral comprehensive treatment table should follow the principles of low toxicity, no peculiar smell, easy degradation, and no obvious influence on the properties of water bodies. Types of chlorine-containing disinfectants, ozone, peroxides, etc. can be selected.

Chlorine-containing disinfectant: chlorine-containing disinfectant has good disinfection effect, is cheap, and has low cost of use. It can be used for pipeline disinfection and water disinfection, effectively reducing the bacterial load in the oral comprehensive treatment table. However, there are also some studies that show that the dentin bonding performance is reduced after the use of chlorine-based disinfection treatment. The chloride ion has a small radius and strong penetrating power, which can destroy the passivation film on the metal surface and cause localized corrosion acceleration (such as the penetrating corrosion phenomenon of pipelines). The irritating taste and toxicity (mutagenic effect) of chlorine-containing disinfectants have also been a major drawback, and the application of chlorine is currently being gradually restricted and reduced in the world.

Ozone: Ozone (O3) is also known as superoxide, and there are also some non-universal names such as "active oxygen water" and "oxygen-enriched water". It is an allotrope of oxygen (O2) and has excellent disinfection and sterilization functions. The killing effect is very rapid. Ozone is soluble in water and can also be used for disinfection of water pipelines. However, ozone is unstable in water, easy to emit and decompose, and it is easy to explode when the ozone content is above 25%. At present, the maximum allowable concentration of ozone is 0.2mg/m3, and it is difficult to guarantee the disinfection effect of such a low concentration. When the ozone concentration is too high, it can cause damage to human health. The higher the concentration of ozone in water, the easier it is to emit into the air, causing indoor ozone pollution such as clinics.

Peroxides: Peroxides are mainly peracetic acid and hydrogen peroxide. The bactericidal effect of peracetic acid is very strong. After the action is completed, it is decomposed into acetic acid and oxygen, and there is no residue. However, peracetic acid has a strong pungent odor and high corrosiveness, so it is not suitable for metal pipelines. Hydrogen peroxide is an ideal disinfectant. It is only decomposed into water and oxygen after the action, and there is no residue. It can disinfect pipelines and water bodies, but the disadvantage is that it is unstable, and its efficacy is affected by factors such as temperature, PH value, and light. The effect is not stable.

3. Silver Hydrogen Peroxide Disinfectant

Hydrogen peroxide silver ion disinfectant is a stable compound solution made of hydrogen peroxide and silver ions. It maintains the advantages of broad-spectrum, high efficiency, quick-acting and non-toxic hydrogen peroxide, and at the same time eliminates the defects such as instability of hydrogen peroxide. The ideal disinfection method for the disinfection of dental chair pipelines. Compared with other disinfection methods, silver hydrogen peroxide ion disinfectant has more advantages in inhibiting bacterial growth after disinfection.

4. Related experiments and results analysis

A university uses silver hydrogen peroxide ions (Oxytech, Germany), ozone, sodium hypochlorite, hydrogen peroxide and other disinfectants to disinfect and compare the water circuit of the oral comprehensive treatment table (high-speed water machine, three-purpose spray gun, mouthwash) , the result is as follows:

Analysis of the experimental results of bacterial colony in water for diagnosis and treatment

From the test results, the disinfection of silver hydrogen peroxide ions is more thorough, and the antibacterial effect after disinfection is even better.

5. Advantages of silver hydrogen peroxide ion in waterway disinfection of oral comprehensive treatment table

It can remove the biofilm at the same time, peel and decompose the biofilm from the inner wall of the pipeline, and the inner wall of the pipeline is cleaner.

It is colorless, odorless, ecologically non-toxic, and the safety level after treatment reaches the drinking water standard.

Compatible with various metal materials, basically no corrosion, the corrosion data is much lower than other disinfection methods.

Broad-spectrum and high-efficiency, with the exception of Legionella pneumophila and Pseudomonas aeruginosa, it is effective against highly resistant fungi and spores.

No chlorine, no toxic by-products will be produced before and after the action and during the process.

Disinfection without dead ends, completely soluble in water, can be mixed with water in any proportion, and the effect can reach every corner of the pipeline.

It is easy to measure and control the dose, and the content in the water body can be accurately measured by auxiliary equipment.