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Common problems handpiece, and maintenance methods

Modern high-speed handpieces (ie, turbine heads) are driven by air to drive the needles to rotate at high speed to cut teeth. The rotation speed and accuracy of the handpieces under the rated air pressure directly affect the doctor’s diagnosis and treatment effect. The higher the rotational speed of the handpieces under the rated air pressure, the better the concentricity of the bushing, the more accurate the drilled area, the easier the doctor, and the lower the patient’s pain. Therefore, it is particularly important that the rotational speed of the handpieces at the rated air pressure is normal or not.

Doctors often encounter a new stylus and still can’t move their teeth, but the driving pressure of the handpieces is normal, which often indicates that the speed of the handpieces does not reach the rated value. Therefore, the user usually obtains a higher handpieces speed by adjusting the air pressure, thereby obtaining a good cutting effect. In fact, this indicates that there is a potential malfunction of the handpieces. The higher the air pressure regulation, the more the damage speed of the handpieces is intensified, and finally the handpieces can not achieve the ideal cutting effect regardless of the high air pressure. Then you have to replace the handpiece bearings. The damage of the handpieces is mainly due to the damage of the bearing inside the handpieces. For the dental drill used in the dental department, the “fatigue life” and “lubrication life” are the most prominent factors affecting the inner bearing life. Therefore, in the usual use of the process should pay attention to the following three points:

  1. Two high-speed handpieces are used interchangeably
    During the use of the handpieces, the bearing always rotates at high speed. At this time, the ball in the bearing continuously applies force to the inner and outer rings of the bearing. The long time it takes will cause the mechanical fatigue of the bearing, which directly affects the bearing. life. Doctors usually use a standard treatment unit with two high-speed handpieces. If the doctor uses a handpieces for a period of time (10 minutes is appropriate) to replace another handpieces, that is, two handpieces. Alternate use, this can greatly alleviate the life effects of handpieces bearings due to “fatigue”. This greatly extends the life of the handpiece. According to statistics, almost 60% of  handpieces bearings are damaged due to “fatigue”.
  2. Bearing cleaning and lubrication is also an important consideration.
    Cleaning is to prevent the foreign matter from entering the bearing and increase the friction between the ball and the inner and outer rings of the bearing. This is a process of replacing the water and foreign matter in the gas path of the handpieces with detergent and lubricating oil. Lubrication is to reduce the friction between the ball and the inner and outer rings of the bearing, so that the handpiece can rotate at high speed. We use professional handpieces lubricants for lubrication. Handpiece lubricants are liquid. When the handpiece bearings rotate at high speed, there will be a lot of loss and the bearings will be in a “dry” state. Therefore, we must strive to fill the handpiece before each use, so that the handpiece bearings are lubricated in time. status. According to different brands and models of  handpieces , select the corresponding driving pressure.

It takes about three months to use the handpieces for professional maintenance of the mobile phone. This maintenance work is best performed by a professional in accordance with certain steps.

Since the advent of the pneumatic turbine dental handpiece in 1957, the handpieces has been popular with patients and operators for its extraordinary rotational speed (above 400,000 rpm, and the high is nearly 1 million rpm), quickly replacing electric handpiecess have become an indispensable tool in today’s dental work. In recent years, although air blasting technology and laser technology have also begun to be used in oral clinical treatment, turbo handpiecess still occupy an important position. Nowadays, dental handpieces have become an indispensable tool for oral clinical work. There are many kinds of handpiecess available on the market, with complete functions and different quality, and there is a wide choice. handpieces sterilization and maintenance should be handled by someone. No matter how busy the work is, these tasks must be done step by step, and you must not ‘cut corners’. The so-called ‘maintenance-free’ handpieces has only been specially processed on the surface of the ball, so that the handpieces will not stick to the debris during use and the lubricant will not be lost. However, the rest of the bearing (such as O-rings, etc.) is still to be maintained, so do not ignore the routine maintenance of these handpiecess.
Flushing is an important preparation for handpieces maintenance. When rinsing, align the air inlet at the rear of the handpieces with a pressurized detergent nozzle and rinse off the debris inside the handpieces with detergent. Then connect the handpieces to the dental chair, do not remove the bur (most handpiecess should not be removed when running), start the machine, and wash off the debris and detergent in the handpieces. The closer the handpieces is to the heat source, the more susceptible the internal components are to damage. The heat source of the high temperature and high pressure sterilizer is at the bottom, so the sterilized paper bag with the handpieces should be on the top layer of the sterilizer, as far as possible from the heat source, not on the bottom layer.
Most sterilizers have a high temperature drying procedure after the sterilization process is completed. This is an important part of preventing the rust of the handpieces. If this program fails, it should be repaired in time. In order to ensure the normal operation of the handpieces, you should also choose the appropriate bur. Large needles and long needles should be used as little as possible, they will greatly increase the load of the ball; if the needle is too small, it will slip, and the needle will be too big to get stuck in the fixing groove; the serious wear of the needle will increase the working load of the bearing. If the air pressure of the handpieces is too high or too low, it will affect the normal operation of the handpieces and cause damage to the handpieces. Different handpiecess have different optimal working pressures, so the air pressure should be adjusted according to the manufacturer’s regulations before starting work every day. When the gas reaches the handpieces from the barometer, the air pressure generally drops by 1.0 psi, which is added to the calculation. In addition, you should always pay attention to the noise generated when listening to the handpieces work, and adjust the air pressure in time when abnormalities are found.
Measures to extend the life of your handpieces:
Before use: Make sure that the compressed air of the dental chair is water-free and oil-free; ensure that the water in the dental chair is free of impurities; ensure that the air pressure of the dental chair is below 40 psi unless the manufacturer has special regulations; ensure that the temperature of the handpieces has been restored To room temperature.
Use process: ensure air pressure is lower than 40psi; try not to use big bur and long stylus; don’t use too big and too small bur; don’t use sharp burs; don’t use mechanics (including clinical models) And the modification of the restoration) use a high speed handpieces.
After use: Wash the handpieces with detergent before sterilization; do not exceed 135 °C sterilization temperature; do not leave the handpieces in the oven overnight; if it is sterilized after lubrication, just add a few drops of lubricant. Weekly maintenance: Use a handpieces cleaner to clean the mandrel of the push-handpieces.
Quarterly maintenance measures: Check the air dryer and water filter of the dental chair.
Bearing replacement: Clean the outer casing of the handpieces with ultrasonic cleaner before installing the bearing; rinse the outer casing of the handpieces after ultrasonic cleaning, clean the head of the handpieces; replace O-rings, springs, fixing clips and other components in time.
handpieces sterilization steps: 1. After the treatment is finished, wipe off the debris outside the handpieces before the needle is removed, and start the machine to rinse the air pipe and water pipe of the handpieces. 2. Remove the burs and remove the handpieces. If the manufacturer recommends ultrasonic cleaning, clean the handpieces head and the entire handpieces according to the manufacturer’s instructions, then put the handpieces on the dental chair, start the machine, and clean the debris in the handpieces; if the manufacturer does not recommend ultrasonic cleaning, Wash the handpieces with soapy water or detergent under running water. 3. If the handpieces needs to be lubricated before heating, use the cleaner recommended by the manufacturer to remove debris from the inside of the handpieces and lubricate the handpieces. If lubrication is not required before heating, use a lubricant-free cleaner and clean the handpieces according to the manufacturer’s instructions. Do not over-lubricate.
4. Put the handpieces on the dental chair, start the machine, and remove the excess lubricant from the handpieces to prevent excessive accumulation of lubricant in the handpieces during the heating process. If the manufacturer does not specify otherwise, the handpieces should be loaded with a bur. 5. Wipe the fiber optic interface and its exterior with a damp alcohol cotton ball (do not have too much alcohol). Do not use high concentrations of solution to avoid damage. 6. After cleaning and drying the handpieces, put it in a paper bag and sterilize the handpieces according to the manufacturer’s instructions and the operating routine of the sterilizer. Keep the handpieces in a proper place after sterilization. Do not open the closed paper bag before use. 7. Start the machine for 20 to 30 seconds before installing the handpieces, and rinse the gas pipe of the dental chair. 8. If the handpieces does not need to be sterilized and lubricated, open the paper bag in front of the patient to show that the handpieces has undergone strict sterilization. If lubrication is required after sterilization, be sure to open the paper bag at the end of the handpieces before use. Do not add excessive lubricant.
3, handpieces common problems and solutions! The driving air pressure of the turbine handpieces The compressed air input into the handpieces must be dry and clean. The air pressure is adjusted to the air pressure according to the manufacturer. Otherwise, the air pressure is too low, the handpieces rotates weakly, and the air pressure is too high, which accelerates the wear of the handpieces bearing. 2. Correct loading and unloading of the burs The loading and unloading burs must be carried out with the clip springs fully open to avoid damage to the clamping shaft. 3. Use qualified burs The handle of the shank is very strict, and must be between 1.59mm-1.60mm. 4. Before the handpieces rotates, it must hold a qualified bur to prevent the clip spring from being damaged at high speed in the relaxed state. 5. Use burs that meet international standards. Even if the bur is slightly bent or missing, it must be replaced immediately to avoid shortening the bearing life.
handpieces maintenance 1. Cleaning (1) Clean the debris near the spray nozzle with the probe before loading and unloading the needle. (2) Use the cleaning solvent provided by the manufacturer inside and outside. 2. Lubrication (1) According to the operation manual provided by the manufacturer, it is required to lubricate the handpieces. (2) Every time before high temperature and high pressure disinfection, the handpieces should be cleaned and lubricated daily to prolong the service life of the handpieces. Use grease: Install the grease on the machine head according to the loading needle, then rotate and refuel; please note that the new handpieces rotates 360°, the old handpieces rotates 180°; use the lubricant to align the lubricant with the tail of the handpieces. It can be done in seconds, then wipe it with a clean paper towel. Rotating the bur: After refueling, put the burs back into the machine head and rotate at low speed for 10-15 seconds; this will allow the lubricant to be applied evenly and evenly inside the machine head; high temperature and high pressure disinfection: the handpieces will be refueled Put it into a high temperature and high pressure disinfection cabinet for disinfection, disinfection at 135 degrees, 2 atmospheres for 10-30 minutes; if there is no rotating needle after adding oil, you can put the needle back to the handpieces at this time and rotate at low speed for 10-15 seconds. bell.
Maintenance of high-speed handpiecess: 1. Refueling work must be done before high-temperature and high-pressure disinfection, but not before use; 2. It is forbidden to idling; it is easy to cause damage to the collet; 3. Use products as much as possible when cleaning and lubricating. 4. Prevent bumps. Otherwise, it will easily affect the life of the clamping device and the bearing, and even the life of the handpieces. 5. The use of a needle that does not meet the diameter requirements will cause the clamping device to fail (the standard bur diameter is 1.59-1.60 mm); 6. Gas supply pressure and gas supply quality Be sure to meet the corresponding configuration requirements of each handpieces. One. Every day, you must use a high-speed handpieces cleaning lubricant or a good quality cleaning lubricant to lubricate and maintain twice, once at noon and once in the afternoon. If it is used continuously for more than 30 minutes, choose the appropriate time for cleaning and refueling during the treatment. If it is autoclaved, it must be thoroughly cleaned and maintained before cleaning. Refueling from the air inlet at the rear of the handpieces until the oil mist is ejected from the nose (about 2-3 seconds). All high-speed handpiecess, there are bearing devices inside the curved handpieces, if not often maintenance lubrication will become the main cause of early failure of the handpieces. Do not use oxidizing potential water (strongly acidic water) or disinfectant to clean the handpieces, which will cause early failure of the handpieces.
It is recommended to sterilize the handpieces using high temperature and high pressure. Lubrication must be cleaned before disinfection. When pressing the handpieces, when using the bur, the chuck part of the holding bur is lubricated and cleaned every week by using the cleaning lubricating oil to remove the residue of the sputum in the chuck, and if it is not cleaned, the stylus may be broken. The handpieces pressure range is: high speed: 1.8-2.2HPA; low speed: 2.5-3.0HPA. Do not use it overloaded. If the air pressure is too high, the bearing may be damaged or the bur may be broken. Use a dry filtered air pressure. Check the compressor and filter regularly for certain maintenance. For the bur of different working diameters, please pay attention to the corresponding speed, otherwise it will accelerate the damage of the bearing.
Matters needing attention: 1. Be sure to clean the dust particles that are sucked back inside the handpieces after each use. Avoid particles that cause damage to the bearings. Two. Before using the handpieces that has just been repaired, please open the back cover of the handpieces, take out the shaft and wrap the machine head with a paper towel, and clean the dust particles remaining in the air path with the cleaning lubricant, and install the shaft and the back. Cover, use it after cleaning. Common faults and troubleshooting methods Possible causes of troubleshooting handpieces rotation is weak. Working air pressure is lower than the rated value. Adjusting the air pressure to the rated value. The bur is worn or bent. Replace the qualified needle bearing. There is dirt or damage on the needle bearing. Cleaning or replacing the bearing. No cooling water mist machine. The head water outlet or the air hole is blocked by a random probe to clear the water and the air hole. The tail pipe of the handpieces leaking treatment unit is out of specification, so that the screw is not tight, the sealing is not tight and the qualified joint is replaced; or the sealing ring and the sealing gasket are loosely checked. Whether the bur is in line with the international standard to replace the qualified burs; no effect, timely delivery to the professional maintenance company, maintenance, use, vibration bearing wear or bumps, send to the manufacturer to specify the repair point maintenance.

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