While no serious injury resulted in this event, there has been a previous report received where this malfunction resulted in a serious injury.Therefore, it must be presumed that recurrence of this malfunction could possibly cause or contribute to a serious injury or require medical or surgical intervention to preclude such.As such, this event is reportable per 21cfr part 803.During evaluation handpiece got hot during evaluation and finally stopped/locked up.Handpiece failed specs due to cap bearing failure and debris built up in head from this.Also had cap damaged from rotor coming in contact with cap.
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