The analysis did show that the head had a dent at the back cap button.This caused the back cap button to stick in, interfering with the internal moving parts.This caused high friction and therefore increase of temperature.In addition the bearings have been gritty and hence they also supported the increase of temperature.The dent shows that the handpiece received a strong hit, e.G.Dropping during reprocessing.The condition of the bearings is the result of the normal wear process.The user instruction requires a visual and functional test prior to each treatment to ensure that the handpiece is running within specification.Reported due to the 2 year presumption rule.
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