The handpiece was not returned for analysis, customer denied doing so.Therefore, it is not possible to determine the root cause why the bur was not held properly.Various causes are possible, like worn clamping system, clamping system not well maintained, bur not correctly inserted, shaft diameter of bur matches not with specification of handpiece, etc.The ifu contains already several warnings and notes which advice how to maintain and use the handpiece correctly.It also informs about the correct specification of the bur shaft.It also states that prior to each treatment the correct seat of th bur should be checked.
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