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 21 cfr part 803.Handpiece got hot.Handpiece failed specs due to cap sticking inwards position.Visible black mark on outside of cap.Old style cap.Cap has white paste and debris built up on outside edges of cap causing it to stick inwards position.Also cap bearing on turbine is dry and doesn't turn freely but still intact.Replaced head drive.Replaced water hoses and water valve.
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