Evaluation and selection of dental high-speed handpieces
The performance of dental handpieces is mainly determined by the following indicators:
1. Service life of mobile phone
It mainly depends on: correct cleaning and maintenance; Bearing material and manufacturing process; The material of the internal pipeline of the mobile phone and the manufacturer.
Bearing is a precision part of turbine mobile phone, and clinicians know it is a vulnerable part. If the cleaning and maintenance methods are not correct, it is easy to cause damage to the mobile phone.
Traditional mobile phone bearings are mostly made of steel. The general movement is composed of outer ring, inner ring, cage and ball. Ceramic ball bearings are now widely used for better dental mobile phones. Ceramic ball bearings have the following advantages:
(1) The hardness of high hardness ceramic material is 20% higher than that of stainless steel material.
(2) The weight of lightweight ceramic material is about 1/2 less than that of stainless steel. The friction between the bearing contact surface and the needle cylinder is reduced.
(3) Durability, more resistant to high temperature and high pressure sterilization than ball bearing.
High quality ceramic bearings should have lower noise and longer service life. Of course, the quality of ceramic bearings in the market is also uneven at present. Not all ceramic bearings are better than steel balls. There is no need to blindly follow this rule, but more attention should be paid to the cutting force, noise, service life and other technical indicators and practical feelings brought by mobile phones to clinicians.
2. Cutting force of mobile phone
The cutting force of the mobile phone is closely related to the power of the mobile phone. The related factors include the torque of the mobile phone, the air pressure, the selection and use habits of the needle, etc.
3. Cooling effect of mobile phone
The commonly used cooling method for mobile phones is single hole spray, and now the most ideal way is 4-hole spray, and the design of spray holes for mobile phones is also very particular. The best effect is that the water mist can evenly cover the whole needle to the top.
4. The feeling of holding
The surface of a good dental mobile phone has a plasma coating material and a thread-like anti-slip design, which makes it feel comfortable and not easy to slip. The weight of the mobile phone is not the lighter the better, but the uniform distribution of the weight after the mobile phone is connected to the pipeline, and whether the position of the gravity balance point is appropriate.
5. Safety and stability of treatment
It depends on the clamping force of the three-leaf spring inside the mobile phone head and the air pressure inside the mobile phone. The clamping force of the international standard is 22N. A good mobile phone needs to be higher than this international standard to ensure the safety of long-term use.
6. Convenience of preparing posterior teeth
The tooth preparation of the posterior teeth is difficult for dentists to operate. The angle between the head and the body of a good mobile phone is reasonably designed, which is very convenient for the tooth preparation operation in the posterior tooth area. Free oral recruitment is more suitable for patients with limited mouth opening. The perfect angle design allows the mobile phone head to have free movement space in the rear tooth area, which can make the patient feel more comfortable.
7. Noise control of mobile phones
The noise of mobile phones will increase the patient's fear of dental treatment. In general, the pressure caused by noise and the impact of long time will damage human health, especially during concentrated working hours. Therefore, the excessive noise of high dental mobile phones is also harmful to the health of dentists. The average mobile phone noise is about 80 decibels. Choosing a low-noise mobile phone is good for patients and doctors. At present, there are low noise mobile phones below 60 decibels available on the market.
8. Control of cross infection
The main influencing factors include: material selection and external coating of mobile phone, anti-back-absorption design of the head, whether it can withstand professional thermal cleaning, whether it can withstand 135 degree sterilization, and whether it has built-in filter screen.
The surface treatment of the mobile phone must be coated, which can withstand high temperature sterilization without rusting, not easily contaminated with dirt, and easy to clean and disinfect.
In the early stage of mobile phones, there was no device to prevent back suction. When the mobile phone stopped running, it generated negative pressure. The mobile phone mainly caused pollution through the following two ways:
(1) Through the exhaust pipe circuit: when the air supply is stopped, the pressure difference caused by the inertia rotation of the needle causes the foreign matter in the mouth to enter the exhaust pipe through the machine head. Form a cross infection source.
(2) Foreign bodies (blood, saliva, debris, dirt, etc.)
Through the water supply pipe circuit: when stopping the spray, in order to prevent water dripping, the general comprehensive treatment table is equipped with a water supply device for suction when stopping. At this time, the foreign bodies in the mouth are sucked back into the water supply pipe of the mobile phone and intruded into the 10 cm~20 cm position of the wire pipe connecting the mobile phone of the comprehensive treatment table, forming a cross infection source.
After blood, saliva and debris enter the interior with air and water, they are distributed to the ball in the bearing and become an important medium of cross infection. Therefore, according to the national mandatory regulations, the use of dental mobile phones must be "one person (patient) one machine", that is, after each use by patients, they must be sent to the disinfection room for cleaning and disinfection, and can be used again after packaging.
At present, it is advocated to use "sanitary mobile phones" with anti-suction devices, which are equipped with check valves inside. It is a valve that controls one direction of water flow and is built in the interface. It can prevent the dirt sucked back from the water supply pipe of the mobile phone from entering the wire, prevent the foreign matter from entering the mechanical sealing structure, and discharge the foreign matter from the gap of the machine head to the outside. It can prevent the cross infection between patients, operators and workers. Extend the service life of shaft core and reduce the use cost. The patient will not be affected by cross infection and worry about it, and will receive treatment at ease.
9. Perfection of mobile phone operation
Nowadays, mobile phones are becoming more and more versatile. Some mobile phones are equipped with optical fiber systems. When in use, there are lights that directly illuminate the operation area, which brings great convenience to doctors. The perfect brightness of mobile phone optical fiber should be as close to natural light as possible. For convenience, it should also be a quick-connect interface and equipped with a push-button head. It is very fast to disassemble the needle and can also reduce pollution.
10. Rationality of price
The prices of dental mobile phones in the dental market are quite different. We must carefully consider the cost performance ratio according to our own situation, put the rationality of the price first, and fully consider the service life of different mobile phones, the investment in bearing replacement, the service life after bearing replacement, the impact on the work efficiency of doctors and other important factors, rather than blindly pursue the purchase of low-price low-grade mobile phones.
Many people think that mobile phones are consumables. However, if mobile phones can be used for 5 or even 10 years, such mobile phones should not be classified as consumables. Although the first investment of a good mobile phone is relatively large, it is durable, and it is not expensive to spread out evenly. Considering the good hand feeling and high work efficiency in use, you can get twice the result with half the effort