Repairing Your Dental Handpiece Posted on 04/16/2019 by The Handpiece Post
The best way is to start with a good visual inspection looking for obvious damage that might warrant repair. If all is OK there, then a burr is placed in the chuck and removed several times. This will let the technician know if the chuck in engaging. A pull tester should then used to check the tightness of the chuck. If the chuck fails this test, then the turbine must be changed. The complete turbine must be changed when failing this test to protect you and the patient from the burr disengaging.
The bearings would also have to be changed in this case because even if the bearings are still good, they cannot be pulled and used again. If the unit passes the pull test, the unit is hooked up to an air station. Running the unit at 32 PSI, and listening carefully it can be determined if the bearings are defective. This is also a good time to test the water jets.
If the bearings must be replaced, then the back cap is removed using a back cap tool. This will expose the turbine and it can be removed at this time. Once the turbine is removed the “O” rings must also be removed.
At this time the inside of the drill head and the back cap will be cleaned completely. All debris and particulate must be removed. It can also be determined how well your handpiece is maintained based on the condition inside the head of the handpiece. Once cleaned all of the “O” rings, spring washers and clips will be replaced with new ones. If there was a water problem some models can be disassembled from the front using a special tool, and the seals replaced. Also the jets can be cleaned at this time. Some models cannot be disassembled here.
Now the turbine can be rebuilt. The bearings must be pressed off the turbine using an arbor press. Once completed the impeller and chuck will be cleaned. Using the proper ceramic bearings, they will be pressed into proper position using the correct press pin.
Now the turbine is complete and can be installed back into the handpiece. Place the rear bearing into the back cap and holding the back cap place the turbine into the head and screw the back cap into place. Insert a burr and move it around a bit to position the turbine. Hook up and test. If performed properly the dental handpiece repair will be completed.
There are other problems that can occur with the dental handpiece such as fiber optics and water lines. However the repair described above is the typical repair we see with the highspeed dental handpiece.
Here at Bauer Dental we no longer rebuild the turbine. It is perfectly acceptable in the industry to perform this procedure however we have chosen to only replace the complete turbine. In our experience too often the chuck may fail wasting the repair and causing inconvenience to the doctor and staff.
What we do is use the high quality Myonic bearings by the New Hampshire bearing company. They manufacturer bearings for many brands so we can be confident of the quality. These bearings are ceramic, and they come already lubed. We use one of two very high end chucks to guarantee quality.
Our turbines should last like a new handpiece would. The only exception we have found is failure due to improper maintenance.