The fate of teeth transfixed by osteosynthesis screws.

Rigid internal fixation with plates and screws for osteosynthesis of facial fractures and osteotomies in the cranio-maxillofacial skeleton is often undertaken in situations in which the exact position of the underlying tooth roots cannot be determined. Therefore, a screw may be inadvertently placed into a root. There is scant data in the literature addressing the consequences of tooth impingement. This 5-year retrospective study documents the long-term outcome of teeth transfixed by osteosynthesis screws in a series of 387 consecutive facial fractures at a Level I trauma center. The incidence of root impingement per screw was 0.47 percent (13 transfixed teeth per 2340+ screws). Mandibular teeth were more "at risk" than maxillary teeth by a ratio of 10:3. No transfixed teeth became infected or required extraction in this series. In conclusion, inadvertent tooth root impingement by osteosynthesis screws appears to have minimal adverse consequences.