The use of cortical screw anchorage for closing a space resulting from the loss of a lower molar--a case report.

Orthodontic microscrews are temporary implants providing skeletal anchorage, which may be used for en-masse incisor retraction, as well as for the protraction of posterior segments in order to close spaces without retracting anterior teeth. A patient, aged 16 was reported in whom a miniscrew of 9.5 mm length and 2 mm dimension was inserted distal to the lower left second premolar 2 months after extracting the first molar with periapical bone lesion after failed endodontic treatment. The lower third molar was mesialised using direct anchorage and a power arm to minimize mesial tipping. The space closed within 20 months, followed by a spontaneous eruption of the adjacent third molar. This treatment method constitutes a good alternative to third molar autotransplantation, allowing the avoidance of the risk of surgical procedure.