Because a serious injury occurred, and intervention was required, this event meets the criteria for reportability per 21 cfr part 803.The returned handpiece was evaluated and met all specifications.There was no evidence of the bur coming out during normal testing conditions or under a 50% addition in drive air pressure from the engineering specification of 40psig.Microscopic evaluation showed some debris inside the cap and head cavities and within the set assembly.A dent was also observed on the handpiece manifold.All components looked dry and no presence of lubricant was evident.
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