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One abutment screw was returned for investigation.Visual evaluation of the as returned abutment identified signs of wear from use, and the drive feature contains the fractured piece of the screw.The piece was too badly damaged to be removed.The screw head was worn from use and fractured at the threads.A device history review was performed and no related nonconformance¿s were noted.A complaint history search was performed using our complaint handling system and there were no additional related complaints against this lot.Appropriate documentation was reviewed.The alleged device malfunction was confirmed.A root cause cannot be determined.The following sections have been updated: b4: date of this report, g4: date received by manufacturer, g7: checked "follow-up", h2: checked follow-up type, h3: changed "no" to "yes", h6: entered evaluation codes, h10: added manufacturer narrative.
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