The dentist (user) did not return the handpiece for evaluation or repair.Therefor an analysis was not possible.To avoid such issues the user instruction contains already several notes, warnings and requests how to prepare the handpiece for each treatment and how to use it: 2.2 technical condition: a damaged device or components can injure patients, users and third parties.Use the device and components only if there is no damage on the outside.Check to make sure that the device is working properly and is in satisfactory condition before each use.Have parts with sites of breakage or surface changes checked by the service.If the following defects occur, stop working and have the service personnel carry out repair work: malfunctions, damage, irregular running noise, excessive vibration, overheating, dental bur or diamonds is not firmly locked in the handpiece.Caution: use of burs with worn or damaged shafts.Risk of injury, tool may fall out during treatment.Never use burs with damaged or worn shafts.Notice: tool shaft slips inside the chuck due to excessive speed of the tool or abrupt engagement of the tool.Property damage to tool shaft and chuck system, reduction of the service life of tool and chuck system.Do not operate the tool at a higher speed than recommended by the manufacturer.Notice: use of burs with worn or damaged shafts.Property damage to the chuck system, tool is difficult or impossible to remove from the chuck system.Do not use burs with damaged or worn shafts.
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