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Progress in Dental Handpiece Disinfection

Stomatology department has always been the department with serious pollution of hospital instruments. Among dental instruments, the contamination of dental handpieces is more prominent. The handpieces are complex and often come in contact with patients’ saliva and blood during use, and are frequently used. The approach to disinfect handpieces is very limited. The progress of disinfection of handpieces is summarized as follows:
1. Microbiological contamination of dental handpieces

In our country, because oral cavity department patient flow is big, dental handpieces use frequently, together with not disinfect in time, dental handpiece microbial pollution, especially hepatitis b virus (HBV) pollution is extremely serious. Hepatitis b patients and pathogen carriers in China

A large number of people are at high risk of infection due to the use of unsterilized or inadequately sterilized handpieces during oral diagnosis and treatment. Epidemiological survey data indicate that handpieces may carry HBV (schedule 1 ~ 6), so disinfection is a weak link in hospital instruments.

2. Handling of internal pollution of handpieces

In order to solve the serious pollution inside the handpiece, a lot of research has been done all over the world.

 

There are two main ways:

1. Wash

The internal turbine cavity and airway channel of the dental mobile phone can be rinsed with clean water, and the external part can be wiped or soaked with chemical disinfectant, which can generally achieve the ideal disinfection effect. Wash the handpiece with clean water before use to remove the bacteria in the channel.

The number of bacteria in washing handpieces decreased significantly. It is found that handpieces could remove 90% of the pollutants in the airway by rotating for 4-7 minutes before use. It is used internal flushing and external rubbing with glutaraldehyde and isopropanol

Human fibroblasts were transfected with hsc-contaminated cell phones without infection.
2. Install anti-reflux facilities

Antireflux device is a relatively effective method to prevent internal pollution of dental handpieces, which can prevent oral contents from being sucked into the turbine cavity, so that only disinfection is required on the external surface of the handpiece.

Compared with dental handpieces not installed with an anti-reflux facility. There is no colon bacillus or enterococcus detected in 138 handpieces equipped with anti-reflux devices. For those who have not installed the anti-reflux facilities, 10 out of 150 are contaminated colon bacillus or enterococcus.

When testing the interior of a handpiece with an anti-retractive vavles, contamination was reduced by 4,000 times. Anti-cross contamination devices can effectively prevent staphylococcus aureus and streptococcus from contaminating the inside of handpieces. Using an air flushing clean system (AFCS) in combination with the vacuum suction method. It can also prevent internal pollution of handpieces. By 1992, an anti-reflux valve had been installed in 69% of dental clinics in Ohio, effectively preventing the occurrence of cross-infection.

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